Title 眼輪筋筋線維の病理学的所見による解剖学的研究
Author(s) 和田, 雅史
Citation 聖学院大学論叢, 5(3): 69-78
URL http://serve.seigakuin-univ.ac.jp/reps/modules/xoonips/detail.php?item_i d=719
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SEigakuin Repository for academic archiVE
Anatomic Research on t h e P a t h o l o g i c a l 0 b s e r v a t i o n o f O r b i c u l a r i s Oculi Muscles
Masafumi W ADA
眼輪筋筋線維の病理学的所見による解剖学的研究
和 田 雅 史
ヒト眼輪筋の筋線維構成とその機能的特徴を明らかにするために,筋線維の横断面積 1mm 2
中の筋線維数,筋線維総数,筋線維の太さ,密度等を samplingmethod ,画像解析装置により計測 し,算出した。さらに,筋の病理学的観察を実施し比較検討をおこなった。対象は, 2 9 歳から 88歳 までの解剖実習屍2 0 体から得られた右側眼輪筋である
O結果は次のごとくである o 1)筋の横断面 積は,下険部が大きく性別では男性が大であった。 2 ) 1 mm 2 中の数は,上険部が大で,性別では 女性が大なる傾向があった。 3 )総数では,下険部が多く,性別で、は男性が多かった。 4 )太さは,
下険部が大きく,性別では男性が大であった。 5 )密度は,下験部が高く 男性が女性より高かっ た 。 6 )組織所見では,大小不同が多く,脂肪性の筋内膜増加,脂肪の周膜増加も多く認められた が,上・下険部,性別による差は認められなかった。以上の結果から、筋の一般的原則を改めて表 したものであるが、男女聞の表情の差が、眼輪筋の筋線維の性差となってあらわれていることも証 明された。
I n t r o d u c t i o n
O r b i c u l a r i s o c u l i muscles , which s i t u a t e s around t h e p a l e b r a l f i s s u r e a s muscles o f f a c i a l e x ‑
p r e s s i o n , i s v e r y t h i n and e n c i r c l e s t h e p a l p e b r a l f i s s u r e . This muscle i s composed o f t h r e e
p a r t s ; t h e e y e l i d , o r b i t and p a r s l a c r i m a l i s , each p a r t named a f t e r t h e r e g i o n t h e muscle c o n t a i n s .
Some d e s c r i p t i o n s g i v e t h e m . d e p r e s s o r s u p e r c i l i i i n a d d i t i o n t o t h e above t h r e e l l l , b u t g e n e r a l l y
t h e f o r m e r d e s c r i p t i o n i s f r e q u e n t . The e y e l i d r e g i o n b e g i n s i n t h e i n n e r p a l p e b r a l l i g a m e n t and
ends i n t h e o u t e r p a r t o f t h e o u t e r c a n t h u s . The o r b i t r e g i o n b e g i n s i n t h e n a s a l p a r t o f t h e f r o n ‑
t a l bone , t h e c r i s t a l a c r i m a l i s a n t e r i o r o f t h e upper jaw bone and t h e i n n e r p a l p e b r a l l i g a m e n t
Key words; O r b i c u l a r i s O c u l i Muscles Myofibrous O r g a n i z a t i o n
Anatomic R e s e a r c h on t h e P a t h o l o g i c a l O b s e r v a t i o n o f O r b i c u l a r i s O c u l i Muscles
and c o n n e c t s w i t h t h e muscle f i b e r e n c i r c l i n g t h e o r b i t . The p a r s l a c r i m a l i s b e g i n s i n t h e c r i s t a l a c r i m a l i s p o s t e r i o r o f t h e l a c r i m a l bone , and t h e muscle f i b e r s meet a t t h e m e d i a l a n g l e o f t h e e y e .
The a c t i o n o f t h e o r b i c u l a r i s o c u l i muscles i s known t o b e mainly r e l a t e d t o t h e movement o f t h e e y e l i d . There a r e many r e s e a r c h r e p o r t s on o t h e r s k e l e t a l muscles such a s t h e l i m b muscles , b u t t h e r e have been no r e p o r t s on t h e o r b i c u l a r i s o c u l i muscles c o n s i d e r i n g i t a s muscles o f f a ‑ c i a l e x p r e s s i o n . T h e r e f o r e , t h i s r e s e a r c h w i l l examine t h e myQfibrous o r g a n i z a t i o n o f t h e o r b i c u ‑ l a r i s o c u l i muscles , such a s t h e muscle f i b e r ' s c r o s s ‑ s e c t i o n a l a r e a , t h e number o f muscle f i b e r s p e r s q u a r e m i l l i m e t e r , t h e t o t a l number o f muscle f i b e r s , i t ' s t h i c k n e s s , and d e n s i t y . By compa‑
r i n g t h e p a t h o l o g i c a l o b s e r v a t i o n o f t h e muscle f i b e r s and o t h e r muscles , 1 i n t e n d e d t o c l a r i f y t h e f u n c t i o n a l c h a r a c t e r i s t i c s o f t h e o r b i c u l a r i s o c u l i m u s c l e s .
M a t e r i a l s and Methods
This r e s e a r c h was conducted on 20 a d u l t humans ( 1 2 male , 8 f e m a l e , a g e s 29 t h r o u g h 88 , a v e r a g e a g e 6 1 . 7 ) used f o r anatomy t r a i n i n g a t t h e School o f Medicine. The r i g h t o r b i c u l a r i s o c u l i muscle was chosen f o r t h e specimen , f i x e d w i t h 10% f o r m a l i n . The middle p a r t o f t h e s u ‑ p e r i o r and t h e i n f e r i o r was d i s s e c t e d a l o n g t h e e y e l i d and t h e o r b i t .
The e x t r a c t e d p i e c e o f muscle i s f i x e d a g a i n w i t h 10% f o r m a l i n , t h e n washed i n w a t e r , d e h y ‑ d r a t e d , and embedden i n c e l l o i d i n . Then i t i s s l i c e d t o 25μm w i t h a J ungian microtome , and s t a i n e d w i t h hematoxylin and e o s i n . Measurements on t h e muscle f i b e r were conducted ~y p i c k ‑ i n g 100 p o i n t s e v e n l y s p r e a d o v e r t h e c r o s s ‑ s e c t i o n o f t h e 10‑20 t i m e s e n l a r g e d photograph o f t h e s p e c i m e n . The number o f t h e muscle f i b e r s p e r 1mm 2 were determined by examining each o f t h e 100 p o i n t s w i t h a microscope (X 4 0 0 ) , c o u n t i n g t h e number o f t h e muscle f i b e r s w i t h i n t h e O.lmm 2 s e c t i o n o f each p o i n t and adding them u p . Furthermore , t h e t o t a l number o f t h e muscle f i b e r s was c a l c u l a t e d by m u l t i p l y i n g t h e t o t a l number o f muscle f i b e r s p e r 1mm 2 w i t h t h e c r o s s ‑ s e c t i o n a l a r e a o f t h e m u s c l e . To measure t h e t h i c k n e s s o f t h e muscle f i b e r , 2 muscle f i ‑ b e r s randomly chosen from each p o i n t was m a g n i f i e d 400 t i m e s and drawn u s i n g a m i c r o s c o p i c drawing d e v i c e . A f t e r u s i n g an X‑Y D i g i t i z e r and a Programmable g e n e r a t o r t o measure t h e a r e a o f t h e 2 muscle f i b e r s i n t h e p i c t u r e , t h e u n i t o f measurement was c o n v e r t e d intoμm 2 and used a s t h e t h i c k n e s s o f t h e muscle f i b e r . I n o r d e r t o d e t e r m i n e t h e d e n s i t y o f t h e muscle f i b e r , t h e a v e r a g e t h i c k n e s s o f t h e muscle f i b e r (μm 2 ) was m u l t i p l i e d by t h e number o f muscle f i b e r s p e r 1mm 2. Then t h e a r e a occupancy r a t i o was c a l c u l a t e d t o g e t t h e d e n s i t y ( % ) .
一 70‑
Anatomic R e s e a r c h on t h e P a t h o l o g i c a l O b s e r v a t i o n o f O r b i c u l a r i s O c u l i Muscles
R e s u l t s
1 .
Myofibrous o r g a n i z a t i o n
The c r o s s ‑ s e c t i o n a l a r e a o f muscle , t h e number o f muscle f i b e r s p e r 1mm 2 , t h e t o t a l number o f muscle f i b e r s , t h e t h i c k n e s s o f t h e muscle f i b e r and i t s d e n s i t y f o r a l l t h e samples o f o r b i c u ‑ l a r i s o c u l i muscles a r e a s f o l l o w s .
Table 1 . C r o s s s e c t i o n a l a r e a , number o f muscle f i b e r p e r s q . mm , t o t a l number o f muscle f i b e r s . c r o s s ‑ s e c t i o n a l a r e a number o f m u s c l e t o t a l number o f m u s c l e m u s c l e s e x n (mm 2 ) f i b e r p e r s q . mm. f i b e r s
mean 立 l a x . ロ l l n 立 l e a n m a x . m l n . ロ l e a n m a x . mm.
male 1 2 1 8 . 4 3 1 . 5 8 . 9 1 7 8 1 . 5 2 6 0 6 1 2 5 0 3 3 2 3 4 . 2 8 2 2 4 5 . 3 1 6 5 8 0 . 4 supenor f e m a l e 8 1 7 . 0 2 3 . 0 1 2 . 3 1 7 9 3 . 5 2 4 8 4 1 4 1 1 3 0 0 8 6 . 2 4 0 5 8 5 . 2 2 1 1 0 3 . 8 t o t a l 2 0 1 7 . 8 3 1 . 5 8 . 9 1 7 8 6 . 3 2 6 0 6 1 2 5 0 3 1 9 7 5 . 0 8 2 2 4 5 . 3 1 6 5 8 0 . 4 male 1 2 2 6 . 4 3 9 . 9 1 7 . 6 1 6 4 6 . 6 2 1 4 9 1 2 7 0 4 2 5 6 5 . 7 5 6 8 1 9 . 5 2 9 4 2 5 . 9 i n f e r i o r f e m a l e 8 1 8 . 1 3 0 . 0 1 1 . 4 1 6 5 4 . 7 1 9 7 9 1 3 5 6 3 0 8 3 0 . 5 5 9 4 3 8 . 0 1 3 0 8 5 . 1 t o t a l 2 0 2 3 . 1 3 9 . 9 1 1 . 4 1 6 4 9 . 9 2 1 4 9 1 2 7 0 3 7 8 7 1 . 7 5 9 4 3 8 . 0 1 3 0 8 5 . 1
」
T a b l e . 2 Mean s i z e o f m u s c l e f i b e r , d e n s i t y o f m u s c l e f i b e r s s i z e o f muscle d m e u n s s c i t l y e of(%) m u s c l e s e x n f i b e r s (μ2 ) f i b e r s
mean m a x . 立 l l n . ロ l e a n male 1 2 3 6 2 . 6 6 0 1 . 8 2 5 5 . 7 6 1 . 8 supenor f e m a l e 8 3 0 9 . 6 4 1 7 . 8 1 8 4 . 1 5 3 . 2
t o t a l 2 0 3 4 1 . 4 6 0 1 . 8 1 8 4 . 1 5 8 . 3 male 1 2 4 1 0 . 3 6 2 1 . 6 2 1 6 . 5 6 5 . 1 i n f e r i o r f e m a l e 8 3 8 9 . 0 5 3 9 . 5 2 1 4 . 2 6 1 . 9
t o t a l 2 0 4 0 1 . 8 6 2 1 . 6 2 1 4 . 2 6 3 . 8
1 ) C r o s s ‑ s e c t i o n a l a r e a o f muscle
Measurements o b t a i n e d from t h e s u p e r i o r and t h e i n f e r i o r showed an average o f 18.4mm 2 f o r
t h e male s u p e r i o r , a maximum o f 31..6mm 2 , and a minimum o f 9mm 2. The average a r e a f o r t h e
Anatomic R e s e a r c h o n t h e P a t h o l o g i c a l O b s e r v a t i o n o f O r b i c u l a r i s O c u l i Muscles
f e m a l e s u p e r i o r was 17.1mm 2 , t h e maximum was 23mm 2 , and t h e minimum was 12.4mm 2. The a v e r a g e f o r male and f e m a l e combined was 17.9mm 2. With t h e i n f e r i o r , t h e male a v e r a g e was 26.4mm 2 , w i t h a maximum o f 40mm 2 , and a minimum o f 17.7mm 2. The f e m a l e a v e r a g e was 18.2mm 2 , t h e maximum 30.1mm 2 , and t h e minimum 1 1 . 5mm 2. The a v e r a g e f o r b o t h s e x e s was 23.1mm 2. On a v e r a g e , b o t h t h e s u p e r i o r and t h e i n f e r i o r were l a r g e r i n male t h a n i n f e m a l e . Be‑
tween t h e s u p e r i o r and i n f e r i o r , t h e i n f e r i o r was l a r g e r f o r b o t h male and f e m a l e . I n d i v i d u a l l y , t h e i n f e r i o r was l a r g e r i n 1 0 male specimens and 3 f e m a l e s p e c i m e n s .
2 ) Number o f muscle f i b e r s p e r 1mm 2
The a v e r a g e number o f muscle f i b e r s i n 1mm 2 o f t h e male s u p e r i o r was 178 1 . 6 , w i t h a max‑
imum o f 2606 , and a ml l l 1 mUm o f 1 2 5 0 . The f e m a l e a v e r a g e was 1 7 9 3 . 5 , w i t h a maximum o f 2484 , and a minimum o f 1 4 1 1 . I n t h e i n f e r i o r , t h e male a v e r a g e was 1 6 4 6 . 7 , t h e maximum was 2149 , and t h e minimum was 1 1 3 8 . Female specimens had an a v e r a g e o f 1 6 5 4 . 8 , w i t h a maximum o f 1979 , and a minimum o f 1 3 5 6 . On a v e r a g e , t h e number o f muscle f i b e r s were l a r g e r i n t h e s u ‑ p e r i o r t h a n t h e i n f e r i o r f o r b o t h male and f e m a l e , t h e d i f f e r e n c e b e i n g a p p r o x i m a t e l y 140 f i b e r s p e r 1mm 2. I n d i v i d u a l l y , t h e number o f muscle f i b e r s o f t h e i n f e r i o r exceeded t h a t o f t h e s u p e ‑ r i o r i n 3 male samples and 2 f e m a l e s a m p l e s . Between male and f e m a l e , t h e a v e r a g e number o f muscle f i b e r s were s l i g h t l y l a r g e r i n f e m a l e specimens f o r b o t h t h e s u p e r i o r andthe i n f e r i o r . But t h e d i f f e r e n c e was merely 1 0 f i b e r s p e r 1mm 2
3 ) T o t a l number o f muscle f i b e r s
The t o t a l number o f muscle f i b e r s i n t h e o r b i c u l a r i s o c u l i muscle a v e r a g e s 33234 f o r t h e male s u p e r i o r , a maximum o f 82245 , and a minimum o f 1 6 5 8 0 . The f e m a l e a v e r a g e was 30086 , t h e maximum was 40585 , and t h e minimum was 2 1 1 0 4 . I n t h e i n f e r i o r , t h e male a v e r a g e was 42566 ,
t h e maximum was 56820 , and t h e minimum was 1 3 0 8 5 . For b o t h male and f e m a l e t h e t o t a l num‑
b e r o f muscle f i b e r s i n t h e i n f e r i o r was l a r g e r t h a n t h a t o f t h e s u p e r i o r , t h e d i f f e r e n c e b e i n g o v e r 9000 f o r male and o v e r 700 f o r f e m a l e specimens , showing a gap between s e x e s . Between s e x e s , male specimens had more muscle f i b e r s i n b o t h t h e s u p e r i o r and t h e i n f e r i o r , t h e d i f f e r e n c e b e i n g 3000 i n t h e s u p e r i o r and a l i t t l e under 1 1 000 i n t h e i n f e r i o r showing a l a r g e gap i n t h e i n ‑ f e r i o r .
I n d i v i d u a l l y , t h e r e was a male sample o f t h e s u p e r i o r which had o v e r 80000 muscle f i b e r s , more t h a n 2 . 7 t i m e s t h e male a v e r a g e . On t h e o t h e r hand , one f e m a l e i n f e r i o r had 13000 f i b e r s , l e s s t h a n 1/2 t h e f e m a l e a v e r a g e .
‑72‑
' .
Anatomic R e s e a r c h o n t h e P a t h o l o g i c a l O b s e r v a t i o n o f O r b i c u l a r i s O c u l i Muscles 4 ) Thickness o f t h e muscle f i b e r
Of a l l t h e samples o f t h e o r b i c u l a r i s o c u l i muscles , t h e a v e r a g e t h i c k n e s s o f a muscle f i b e r i n t h e male s u p e r i o r was 362.7μm 2 , t h e maximum was 602μm 2 , and t h e minimum was 256μm 2 The f e m a l e a v e r a g e was 309.6μm 2 , t h e maximum was 418μm 2 , and t h e minimum was 1 8 4 μ m 2 . The a v e r a g e f o r male and f e m a l e combined was 341μm 2 . I n t h e i n f e r i o r , t h e male a v e r a g e was 410.3μm 2 . t h e maximum was 622μm 2 , and t h e minimum was 217μm 2 . The f e m a l e a v e r ‑ a g e was 389μm 2 , t h e maximum was 540μm 2 , and t h e minimum was 214μm 2. The a v e r a g e f o r b o t h s e x e s was 402μm 2. I n b o t h t h e s u p e r i o r and t h e i n f e r i o r , male samples t e n d e d t o b e t h i c k ‑ e r t h a n f e m a l e s a m p l e s . Furthermore , when comparing t h e s u p e r i o r and t h e i n f e r i o r , t h e i n f e r i o r was l a r g e r t h a n t h e s u p e r i o r f o r b o t h s e x e s . I n d i v i d u a l l y , t h e r e ware 2 examples w i t h t h i c k n e s s e s i n t h e 600μm 2 l e v e l and 3 examples i n t h e 500μm 2 l e v e l f o r male samples o f t h e i n f e r i o r and s u p e r i o r combined , i n d i c a t i n g a wider r a n g e o f d i v e r s i t y between i n d i v i d u a l samples compared t o f e m a l e s which had 1 example w i t h a t h i c k n e s s i n t h e 500μm 2 l e v e l .
5 ) C o r r e l a t i o n
,between t h e c r o s s ‑ s e c t i o n a l a r e a o f t h e muscle and t h e number o f muscle f i ‑ b e r s p e r 1mm 2 , t h e t o t a l number o f muscle f i b e r s and t h e t h i c k n e s s o f a muscle f i b e r .
When o b s e r v i n g t h e c o r r e l a t i o n o f t h e c r o s s ‑ s e c t i o n a l a r e a o f a muscle w i t h t h e number o f muscle f i b e r s p e r 1mm 2 and t h e 1 ' t a l number o f muscle f i b e r s , t h e r e were 3 examples ( 2 male , 1 f e m a l e ) o f t h e s u p e r i o r which had b o t h above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a and above a v e r a g e number o f muscle f i b e r s p e r 1mm 2. 5 samples ( 3 male , 2 f e m a l e ) had above a v e r a g e c r o s s ‑ s e c ‑ t i o n a l a r e a and below a v e r a g e number o f muscle f i b e r s p e r 1mm 2. 7 samples ( 5 male , 2 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a and above a v e r a g e number o f muscle f i b e r s p e r 1mm 2. 5 samples ( 2 male , 3 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and below a v e r a g e number o f muscle f i b e r s p e r 1mm 2. I n t h e i n f e r i o r , t h e r e were 7 examples ( 5 male , 2 f e m a l e ) w i t h above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e muscle f i b e r s p e r 1mm 2. 3 samples ( 3 m a l e ) had above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and below a v e r a g e number o f muscle f i b e r s p e r 1mm 2. 4 examples ( 3 male , 1 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e number o f muscle f i b e r s p e r 1mm 2. 6 samples ( l male , 5 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and below a v e r a g e number o f muscle f i b e r s p e r 1mm 2
Next , t h e r e i s t h e r e l a t i o n s h i p between t h e c r o s s ‑ s e c t i o n a l a r e a o f muscle and t h e t o t a l number
o f muscle f i b e r s . I n t h e s u p e r i o r , t h e r e were 6 samples ( 4 male , 2 f e m a l e ) which had above a v e ‑
r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e t o t a l number o f muscle f i b e r s . 2 examples
Anatomic R e s e a r c h on t h e P a t h o l o g i c a l O b s e r v a t i o n o f O r b i c u l a r i s O c u l i Muscles
( 1 male , 1 f e m a l e ) had above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and below a v e r a g e t o t a l number o f muscle f i b e r s . 3 samples ( 2 male , 1 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e t o t a l number o f muscle f i b e r s . 9 examples ( 5 male , 4 f e m a l e ) had b e ‑ low a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and below a v e r a g e t o t a l number o f muscle f i b e r s . l n t h e i n f e r i o r , 9 examples ( 7 male , 2 f e m a l e ) had above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e t o t a l number o f muscle f i b e r s . 1 male sample had above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and below a v e r a g e t o t a l number o f muscle f i b e r s . 1 0 samples ( 4 male , 6 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and below a v e r a g e t o t a l number o f muscle f i ‑ b e r s . None o f t h e samples o f t h e i n f e r i o r had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e t o t a l number o f muscle f i b e r s .
l n t h e c o r r e l a t i o n between t h e c r o s s ‑ s e c t i o n a l a r e a o f muscle and t h e t h i c k n e s s o f t h e muscle f i b e r , t h e r e were 4 examples ( 3 male , 1 f e m a l e ) o f t h e s u p e r i o r which had above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e t h i c k n e s s o f t h e muscle f i b e r . 4 samples ( 2 male , 2 f e m a l e ) had above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and below a v e r a g e t h i c k n e s s o f t h e muscle f i b e r . 4 samples ( 3 male , 1 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e t h i c k n e s s o f t h e muscle f i b e r . 8 samples ( 4 male , 4 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e t h i c k n e s s o f t h e muscle f i b e r . l n t h e i n f e r i o r , t h e r e were 5 male samples w i t h above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f muscle and above a v e r a g e t h i c k n e s s o f t h e muscle f i b e r . 5 samples ( 3 male , 2 f e m a l e ) had above a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f t h e muscle and below a v e r a g e t h i c k n e s s o f t h e muscle f i b e r . 4 samples ( 1 male , 3 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f t h e muscle and above a v e r a g e t h i c k n e s s o f t h e muscle f i b e r . 6 samples ( 3 male , 3 f e m a l e ) had below a v e r a g e c r o s s ‑ s e c t i o n a l a r e a o f t h e muscle and b e ‑ low a v e r a g e t h i c k n e s s o f t h e muscle f i b e r .
6 ) D e n s i t y o f muscle f i b e r s
l n t h e comparison o f t h e muscle f i b e r d e n s i t y o f t h e o r b i c u l a r i s o c u l i muscles , t h e a v e r a g e f o r t h e male s u p e r i o r was 6 1 .8%, t h e maximum was 75.3% , and t h e minimum was 47.5%. The f e m a l e a v e r a g e was 53.2% w i t h a maximum o f 6 7 . 1 % and a minimum o f 42.6%. l n t h e i n f e r i o r , t h e male a v e r a g e was 65.2% w i t h a maximum o f 83.7% and a minimum o f 36.3%. Both male and f e m a l e samples had a h i g h e r d e n s i t y i n t h e i n f e r i o r t h a n i n t h e s u p e r i o r . D e n s i t y i n male samples e x ‑ ceeded f e m a l e samples i n b o t h t h e s u p e r i o r and t h e i n f e r i o r
l n d i v i d u a l l y , d i f f e r e n c e s o f d e n s i t y between specimens were s m a l l i n t h e s u p e r i o r o f b o t h male and f e m a l e . Samples o f t h e i n f e r i o r , e s p e c i a l l y i n male specimens had a l a r g e d i v e r s i t y i n
‑ 7 4 ‑
Anatomic Research on t h e P a t h o l o g i c a l O b s e r v a t i o n o f O r b i c u l a r i s O c u l i Muscles
d e n s i t y , t h e maximum being 83.7% and t h e minimum 36.3% showing a gap o f approximately 2 . 3 t I mes.
1 . 1 Pathological observation
When pathologica l 1 y observing t h e s u p e r i o r and t h e i n f e r i o r o f each specimen according t o r e f e r e n c e s ( 2 ) , ( 3 ) , samples o f t h e s u p e r i o r had 1 2 examples o f i r r e g u l a r s i z e , 4 examples o f vacuola‑
t i o n , 4 examples o f h y a l i n e degeneration , and 3 examples o f d e f o r m a t i o n . There were 1 2 exam‑
p l e s showing an i n c r e a s e i n endomysium , o f which 8 examples were a l i p h a t i c , and 4 examples
T a b l e . 3 O r b i c u l a r i s O c u l i ( s u p e r i o r )
♂ ♀
1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1314151617181920 1 . i r r e g u l a r s i z e 00 0000000 O 00
2 . m e t a m o r p h o s i s O 00
C e l l 3 . a t r o p h y O
4 . v a c u o l a r d e g e n e r a t i o n O O O O
5 . h y a l i n e d e g e n e r a t i o n O O O O
6 . f a t t d e g e n e r a t i o n
Endomay 7 . f a t r e p l a c e m e n t O O O O O 000
‑ s lU m 8 . f i b r o u s t i s s u e r e p l a c e m e n t O O O O
Perimysium 9 . f a t r e p l a c e m e n t 00 O O O O 00
mternum 1 0 . f i b r o u s t i s s u e r e p l a c e m e n t O O O
」 ー
T a b l e . 4 O r b i c u l a r i s O c u l i ( i n f e r i o r )
♂ ♀
1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 . i r r e g u l a r s i z e o 0 0 00 00
2 . m e t a m o r p h o s i s o 0 00 0 0
C e l l 3 . a t r o p h y O
4 . v a c u o l a r d e g e n e r a t i o n O
5 . h y a l i n e d e g e n e r a t i o n O O O O O
6 . f a t t d e g e n e r a t i o n
Endomay 7 . f a t r e p l a c e m e n t O O 00 O 00 O
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