Monday, March 16, 2015
Extraocular Muscles Function and Innervation
Eye Movement Control Systems
Extraocular Muscles : Function
Superior Oblique muscle : can depress and abduct the eye from the neutral position. From the adducted position, it is the only muscle that can depress the eye
Inferior Oblique muscle : can elevate and abduct the eye from the neutral position.From the adducted position, it is the only muscle that can elevate the eye
Superior rectus muscle : can elevate and adduct the eye from neutral position. it is the only muscle that can elevate the eye from the abducted position
Inferior rectus muscle : can depress and adduct the eye from the neutral position. From the abducted position , it is the only muscle that can depress the eye.
The Lateral rectus muscle can abduct the eye.
Innervation:
Cranial Nerve III :
Cranial Nerve IV :
Extraocular Muscles : Function
Superior Oblique muscle : can depress and abduct the eye from the neutral position. From the adducted position, it is the only muscle that can depress the eye
Inferior Oblique muscle : can elevate and abduct the eye from the neutral position.From the adducted position, it is the only muscle that can elevate the eye
Superior rectus muscle : can elevate and adduct the eye from neutral position. it is the only muscle that can elevate the eye from the abducted position
Inferior rectus muscle : can depress and adduct the eye from the neutral position. From the abducted position , it is the only muscle that can depress the eye.
The Lateral rectus muscle can abduct the eye.
Innervation:
- Medial rectus : adducts eye
- Superior rectus : elevate, intorts, adducts eye
- Inferior rectus : depresses, extorts, adducts eye
- Inferior Oblique: elevates, extorts, abducts eye
Cranial Nerve IV :
- Superior Oblique : depresses, intorts , abducts eye
- Lateral rectus: Abducts eye.
