MUSCLES 23 



fornix of conjunctiva(A) (Upper division of 3rd). [Raises upper 

 eyelid.] The four recti arise from two common tendons 

 superior and inferior. Superior common tendon (ligament of 

 Lock wood) rises above and outside optic foramen and gives 

 origin to superior, internal and external recti (upper head). 

 The inferior common tendon (ligament of Zinn) below and 

 outside optic foramen goes to inferior, internal, and lower 

 head of external recti. 



Rectus superior : upper margin of optic foramen(T) 

 sclerotic(x) (Upper division of 3rd). [Rotates cornea up- 

 wards and inwards.] 



Rectus inferior : margin of optic foramen(T) sclerotic(x) 

 (Lower division of 3rd). [Rotates cornea downwards and 

 inwards.] 



Rectus interims : optic foramen(x) sclerotic(T) (Lower 

 division of 3rd). [Rotates cornea inwards]. 



Rectus externus: Upper head. Optic foramen(T). Lower 

 head. Optic foramen and process of bone at the lower margin 

 of spheroidal fissure(x) sclerotic(x) (6th). [Rotates cornea 

 outwards.] Between the two heads pass ^rd, 6th, nasal branch oj 

 5/A nerve and ophthalmic vein. 



Obliquus superior : inner part of optic foramen(x) passes 

 through "pulley," thence reflected backwards and outwards 

 between superior rectus and eyeball to be attached to scle- 

 rotic between superior and external recti (x) (4th). [Rotates 

 cornea downwards and outwards.] The qth nerve enters its 

 upper surface. 



Obliquus inferior : depression on orbital plate of superior 

 maxilla(F) external surface of sclerotic under cover of 

 external rectus(x). (Lower division of 3rd). [Rotates cornea 

 upwards and outwards.] Passes outivards from origin beneath 

 inferior rectus and between eyeball and external rectus to its in- 

 sertion. 



NASAL REGION. 



Pyramidalisnasi : occipito-frontalis(F) compressor naris(A) 

 (Facial). [Wrinkles skin over nose.] 



Compressor naris : facial surface of superior maxilla by side 

 of anterior nares(p) its fellow of side(A) (Facial). [Closes 

 anterior nares.] 



Levator labii superioris alseque nasi : root of nasal process 

 of superior maxilla(F) ist slip, cartilage of ala ; 2nd slip, 

 orbicularis oris(p) (Facial). [Raises ala of nose and upper lip.] 



Depressor al nasi : incisor fossa of superior maxilla(F) 

 septum and ala of nose(p) (Facial). [Very little ; depresses 

 ala.] 



