56 



THE MUSCLES. 



Fig. 49. 



hinder angle of the orbit, passes along- its inner wall, and is in- 

 serted into the antero-internal part of the circumference of the 

 eyeball. 



4. M. rectns superior (Fig. 49 r#.). 



Duges, post-orbito-sous-oculaire. 



Arises by a slender tendon from the f ronto-parietal bone, widens 



rapidly, and runs forwards and out- 

 wards to be inserted into the upper 

 part of the circumference of the bulbm. 



5. M. obliquus inferior (Fig. 48 oi], 



Duges, pre-sous-orbito-oculaire. 



This muscle arises near the floor of 

 the orbital cavity^ at the inner and an- 

 terior angle, from the palatine bone by 

 a thin and long tendon, runs under 

 Harder's gland outwards and back- 

 wards, and is inserted, almost at a right 

 angle with the axis of the eye, into 

 the anterior part of the circumference 

 of the eyeball. 



Eye-muscles of Kama esculcnta, from 



above. 



n Membrana nictitans. 

 ' Tendon of membrana nictitans. 

 p M. ptei-ygoideus. 

 rs. M. rectus superior. 

 t M. temporalis. 



Fig. 50. 



6. M. obliquus superior (Fig. 48 os}. 



Duges, pre-sus-orbito-oculaire, n. 7. 



The tendon of this small muscle arises from the inner end of the 

 palatine bone, near the origin of the m. olliguus 

 inferior, runs upwards, backwards, and out- 

 wards, and passes into a flat muscle, which 

 rapidly becomes broader, and is inserted into 

 the upper surface of the eyeball. 



7. J/. retractor bulbi (Figs. 48 r, 50 r, r). 



Duges, orbito-post-oculaire or choanide, n. lo. 

 Zenker, m. opticus. 



This muscle surrounds the optic nerve, and 

 is situated within the cone formed by the four 

 recti muscles; it consists of three portions, 

 which take their broad and fleshy (the recti 

 and obliqui arise by thin tendons) origins from 

 the under surface of the parasphenoid. The 

 first portion (Fig. 50 r] arises from the under 

 surface of the parasphenoid, nearly as far as the 



U 



Eye-muscles of llama escu- 

 lenta, from below, the m. 

 recti and obliqui have been 

 removed. 



n Tendon of membrana nic- 

 titans. 



r M. retractor bulbi, lower 

 part. 



r' Second part of same. 



