What structures does the oculomotor nerve innervate?

What structures does the oculomotor nerve innervate?

The oculomotor nerve (the third cranial nerve; CN III) has three main motor functions: Innervation to the pupil and lens (autonomic, parasympathetic) Innervation to the upper eyelid (somatic) Innervation of the eye muscles that allow for visual tracking and gaze fixation (somatic)

What is the function of CN III?

The oculomotor nerve is the third cranial nerve (CN III). It allows movement of the eye muscles, constriction of the pupil, focusing the eyes and the position of the upper eyelid. Cranial nerve III works with other cranial nerves to control eye movements and support sensory functioning.

What nerve innervates the sphincter Pupillae?

This muscle is innervated by parasympathetic nerve fibres derived from the oculomotor nerve (postganglionic fibres from the ciliary ganglion travel via the short ciliary nerves) although sympathetics also terminate in this muscle.

What does oculomotor nerve supply?

The oculomotor nerve is the third cranial nerve (CN III). It enters the orbit through the superior orbital fissure and innervates extrinsic eye muscles that enable most movements of the eye and that raise the eyelid. Cranial nerves IV and VI also participate in control of eye movement.

What is oculomotor supply?

The nerve also contains fibers that innervate the intrinsic eye muscles that enable pupillary constriction and accommodation (ability to focus on near objects as in reading). The oculomotor nerve is derived from the basal plate of the embryonic midbrain….

Oculomotor nerve
To	superior branch, inferior branch

Is the oculomotor nerve sympathetic or parasympathetic?

Oculomotor nerve (III) is responsible for the control of the pupil (constriction) via parasympathetic fibres (this is opposed by dilator tone controlled by sympathetic pathways).

Is the oculomotor nerve sensory or motor?

The trochlear, abducens, accessory, and hypoglossal nerves are only motor nerves; the trigeminal nerve is both sensory and motor; the oculomotor nerve is both motor and parasympathetic; the facial glossopharyngeal, and vagus nerves have sensory, motor, and parasympathetic components (Standring, 2008).

What is the role of sphincter Pupillae?

The sphincter muscle fibers are located near the pupillary margin and are slightly anterior to the pigmented epithelium of the iris. It encircles the pupil of the iris and functions to constrict the pupil in bright light via the pupillary light reflex or during accommodation.

What is the function of the sphincter Pupillae and dilator Pupillae?

The diameter of the pupil is dynamic and it is regulated by a pair of antagonistic muscles found in the iris; the sphincter pupillae and the dilator pupillae….Sphincter pupillae.

Origin and insertion	Pupillary margin of iris
Blood supply	Long posterior ciliary arteries, anterior ciliary arteries (via minor arterial circle)