Nerve Supply Of Eye Muscles

Trochlear nerve CN IV A lesion of CN IV will paralyse the superior oblique muscle. The development of the extraocular muscles is dependent on the normal development of the eye socket while the formation of the ligament is fully independent.

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Depresses and abducts eye.

Nerve supply of eye muscles. They are actually the anterior extensions of the vascular layer of the eyeball. Intrinsic eye muscles visceral motor function These muscles are located within the eye itself and are both supplied by parasympathetic fibers of the oculomotor nerve. There are 12 pairs of nerves in the Central Nerve System a left and a right nerve for each.

It also has branches that serve the orbit and other parts of the face. The affected eye is displaced laterally by the lateral rectus and inferiorly by the superior oblique. Abducens nerve CN VI Superior oblique.

The superior tarsal muscle is by the sympathetic nervous system. All these muscles are supplied by the third nerve except the superior oblique which is supplied by the fourth and the external rectus which is supplied by the sixth. The levator palpebrae superioris is supplied by the oculomotor nerve CN III.

Sclera posterior to lateral rectus. Nerves that innervate the extraocular muscles are called bulbomotors and they are the oculomotor CN III trochlear CN IV and abducens CN VI nerves. There is no obvious affect of the resting orientation of the eyeball.

Nerve-Supply to the Eye. Sclera posterior to superior rectus. Abducent nerve lies first inferior then lateral to the divisions of nerve.

The extraocular muscles are seven muscles supplied by cranial nerves that are responsible for eye movement in some cases when these nerves are affected consequently they affect eye movements. There are six main cranial nerves that innervate the eye and its accessory structures. Most of these nerves enter the eye through the orbital cone while others reach the accessory structure directly.

Lateral view of the nerves of the eyeball. Somatomotor innervation of the levator palpebrae superiorus originates in a subnucleus of the somatic portion of the oculomotor nucleus in the midbrain near the dorsal midline. Third nerve palsy therefore results in the unopposed action of both the lateral rectus and superior oblique muscles which pull the eye inferolaterally.

Nerve is crossed by trochlear nerve which become superomedial to it. As such they dont conform to the typical organization of other muscles with well defined origins and insertions. The trochlear nucleus of one side supplies the superior oblique of the contralateral side due to decussation of fibers of the trochlear nerve in the midbrain.

The Cranial Nerves that control the eye include the Optic Nerve the Oculomotor Nerve the Trochlear Nerve and the Abducens Nerve. The main function of the eye is sight and the nerve that enables sight is the optic nerve CN II. Some control muscles and others control senses.

Trochlear nerve CN IV Inferior oblique. Four of the extraocular muscles originated from a tendinous band surrounding the optic nerve. The eye adopts a position known as down and out.

And the eye itself will be drooping slightly downwards and looking out towards the side of your face. Cranial nerve 3 is also called the oculomotor nerve because this is the main nerve that stimulates ther eye ocular muscles. Trochlear frontal and lacrimalnerves traverse the fissure above the anulusof zinn.

Oculomotor nerve CN III. Olfactory Nerve CN I Optic Nerve CN II Oculomotor Nerve CN III Trochlear Nerve CN IV Trigeminal Nerve CN V Abducens Nerve CN VI Facial Nerve CN VII Vestibulocochlear Nerve CN VIII Glossopharyngeal Nerve CN IX Vagus Nerve CN X Accessory Nerve CN XI Hypoglossal Nerve CN XII Blood Vessels CSF. Your eyelid will droop.

The oculomotor nerve also carries parasympathetic fibers that supply the intrinsic muscles of the eye and transmits propriosensation from the extraocular muscles. Other muscles superior inferior medial recti and inferior oblique innervated by the 3 rd oculomotor nerve The nerves enter the ocular surface of the respective muscles. The oculomotor nerve also innervates the intrinsic ocular muscles and thus regulates accommodation.

Elevates and abducts eye. Six skeletal muscles surround and produce various eye movements. Nerves are in the green boxes.

Hence the subsequent nerve supply innervation of the eye muscles is from three cranial nerves. If this nerve has been damaged by disease or trauma your pupil will be larger than normal and will not be functioning properly. Superioris and indirectly the iris and ciliary muscle of the eyeball through the ciliary ganglion.

The nasociliary nerve is the sensory nerve to the eyeball. One of its branches the infratrochlear nerve supplies the eyelids conjunctiva and lacrimal sac. The third nerve also supplies the levator palpebra.

Like comment share subscribe Facebook. Oculomotor nerve CN III A lesion of the oculomotor nerve affects most of the extraocular muscles. The oculomotor nerve supplies all extraocular muscles except the superior oblique CNIV and the lateral rectus CNVI.

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