Diplopia Impaired Ocular Movement

The line of action of individual ocular muscles (contd)

As a result of the angle of insertion into 'O. S.R.

the globe, the inferior and superior recti and the oblique muscles also have a rotatory or torsion effect.

When the eye is turned out, the oblique muscles rotate the globe; when turned in, the inferior or superior recti rotate the globe. S.O. I.R.

OCULOMOTOR (III) nerve

The oculomotor nucleus lies in the ventral periaqueductal grey matter at the level of the superior colliculus. Nerve fibres pass through the red nucleus and substantia nigra and emerge medial to the cerebral peduncle.

The nucleus has a complex structure:

Perlia's nuclei (parasympathetic) concerned with convergence and accommodation. \

Edinger - Westphal nuclei (parasympathetic) concerned with pupil constriction Medial rectus and --inferior oblique

Inferior rectus----

Superior rectus —

Caudal nucleus of Perlia (levator of eyelid)

Aqueduct

Superior rectus —

Superior colliculus nerve nucleus

Aqueduct

Superior colliculus

Red -- nucleus

nerve nucleus

Substantia

Cerebral peduncle nerve

Red -- nucleus

Substantia

Cerebral peduncle nerve

The nucleus is a paired structure which lies close to the midline, the portion representing the medial rectus abutting its neighbour.

Was this article helpful?

0 0
Peripheral Neuropathy Natural Treatment Options

Peripheral Neuropathy Natural Treatment Options

This guide will help millions of people understand this condition so that they can take control of their lives and make informed decisions. The ebook covers information on a vast number of different types of neuropathy. In addition, it will be a useful resource for their families, caregivers, and health care providers.

Get My Free Ebook


Post a comment