anatomyphysiologyblog - Extra-ocular Muscles of Eye: their attachment, actions in addition to nervus supply

Objectives:

Describe the attachment of extra-ocular muscles.

Describe the activity as well as nervus provide of extra-ocular muscles.

Extra-ocular muscles of eye

The musculus acting on the oculus ball to gain diverse movements of oculus are called extr-aocular muscles which consists of

Four recti	Two oblique muscles
Superior rectus	Superior oblique
Inferior rectus	Inferior oblique
Medial rectus
Lateral rectus

Recti muscles

Origin – from posterior business office of the reach from a mutual tendinous ring

Insertion – the muscles hold forwards inwards a cone of muscles as well as spread out at the sites of insertion into the sclera of the eyeball.

Oblique Muscles

Superior oblique: arises from the lesser fly of sphenoid os as well as inserts into the sclera behind the equator of eyeball.

Inferior Oblique: arises from orbital surface of maxilla inwards the flooring of the reach as well as inserts into the sclera behind the equator of the eyeball.

Innervations or Nerve provide of extra-ocular muscles

All these muscles are supplied past times oculomotor nerve (Cranial Nerve III) except lateral rectus (by abducent nerve – CN VI) as well as superior rectus (by trochlear nerve – CN IV).

Actions of extra-ocular muscles

Superior rectus –elevates, adducts as well as medially rotates the eyeball

Inferior rectus –depresses, adducts as well as medially rotates the eyeball

Medial rectus – adducts the eyeball

Lateral rectus – abducts the eyeball

Superior oblique – depresses, abducts as well as medially rotate the oculus ball

Inferior oblique – elevates, abducts as well as laterally rotate the eyeball.


REFERENCES:

Following resources are used piece preparing this ship service (readers are strongly recommended to larn             through them for to a greater extent than details):

K. L. Moore's Clinically Oriented Anatomy

R. Snell's Clinical Anatomy

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