Question: What Is Edinger Westphal Nucleus?

What is cranial III?

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 smallest cranial nerve?

trochlear nerveThe trochlear nerve is the fourth cranial nerve (CN IV) and one of the ocular motor nerves that controls eye movement. The trochlear nerve, while the smallest of the cranial nerves, has the longest intracranial course as it is the only nerve to have a dorsal exit from the brainstem.

Where is the dorsal motor nucleus of the vagus nerve located?

medulla oblongataThe dorsal vagal nucleus, also known as the vagal nucleus, dorsal nucleus of the vagus nerve or the dorsal motor nucleus of the vagus nerve, is a elongated nucleus within the medulla oblongata that provides parasympathetic motor innervation to the viscera of the thorax and abdomen.

What is the ciliary ganglion?

The ciliary ganglion is a bundle of nerve parasympathetic ganglion located just behind the eye in the posterior orbit. It is 1–2 mm in diameter and in humans contains approximately 2,500 neurons. The ganglion contains postganglionic parasympathetic neurons.

Where is the Edinger Westphal nucleus?

The EWpg is what is thought of as the classic ONC—sending parasympathetic nerve fibers towards the eye. It is located in the midbrain immediately dorsal to the oculomotor nucleus near the level of the superior colliculus, which is why it is often included in the overarching term oculomotor complex.

What is the nucleus Ambiguus?

The nucleus ambiguus is the common nucleus of the efferent fibers for glossopharyngeal (CN IX) and vagus (CN X) nerves. … The nucleus ambiguus provides fibers that innervate the somatic muscles of the pharynx, larynx, and soft palate.

Does cranial nerve 3 Decussate?

The cranial nerves do not decussate generally with exceptions being CN2, CN4, CN7 and CN12. That means if a lesion affects Cranial Nerve 1, 5, 8, 9 and 11 or the respective nucleus there is either sensation loss or atrophy of the muscle (dependent on what the nerve does) of the ipsilateral side.

Which cranial nerves affect Eye Movement?

Cranial nerves III (CNIII) (oculomotor), IV (trochlear), and VI (abducens) control the position of the eyeballs; CNIII influences the position of the eyelids and the size of the pupils.

How many Edingers are in the Westphal nucleus?

1 Edinger–Westphal Nuclei (EW) The Edinger–Westphal nuclei are located just dorsal to the third cranial nerve motoneurons and represent the visceral (parasympathetic portion) component of the oculomotor complex.