MUSCLES OF THE EYE

There are two types of muscles in the eye EXTRINSIC MUSCLES and INTRINSIC MUSCLES. Extrinsic muscles are also called extra ocular muscles while the Intrinsic muscles are also called intra ocular muscles

 

EXTRINSIC MUSCLES 

A set of 6 extra ocular muscles superior, Inferior, Lateral &Medial rectus as well as, Superior & Inferior oblique helps to control the eye movement in all direction to see.         

 (A ) Superior rectus(B) Inferior rectus(C) Lateral rectus(D)  Medial rectus(E) Superior oblique(F) Inferior oblique           

 

The four Rectus muscles which help to move an eyeball in left right up and down. These muscles originate from the apex of the orbit called ANNULUS OF ZIN and get inserted on to the sclera at different distances from the limbus , while the two Oblique muscles helps to rotatory/tortional movement of eye in clock wise and anti clock wise directions. The superior oblique muscles originate from the bone of sphenoid and inserted on to the upper and outer part of the sclera while Inferior oblique muscle originate from the orbital plate of maxilla and get inserted on to the lower and outer part of the sclera.

 

 

INTRINSIC MUSCLES

A set of 3 intra ocular muscles that controlled by autonomic nervous system, work in response to amount of light, closeness of an object. It also helps to serve to focus the eye and control the amount of light entering it. (Cilliary muscles, Iris sphincter, Pupilo dilator muscle)

By -Assistant Professor- — Ms. Pridhi Panwar 
Department – OPTOMETRY
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