Are the cranial nerves contralateral?
All cranial nerves are paired, which means they occur on both the right and left sides of the body. The muscle, skin, or additional function supplied by a nerve, on the same side of the body as the side it originates from, is an ipsilateral function.
What are the 4 cranial nerves that innervate the eye?
The muscles that act on and around the eyes receive innervation from four cranial nerves and the sympathetic nervous system.
- Oculomotor Nerve.
- Trochlear Nerve.
- Abducens Nerve.
- Facial Nerve.
- Sympathetic Nervous System.
What muscles does cranial nerve 1 innervate?
Located in the superior orbital fissure. Innervates the levator palpebrae superioris, superior rectus, medial rectus, inferior rectus, and inferior oblique, which collectively perform most eye movements.
Which cranial nerve is contralateral?
Contralateral and Unilateral Innervation
| Nerve | Innervation |
|---|---|
| Trigeminal (V) | Bilateral symmetry |
| Facial (VII) | Mixed bilateral symmetry and contralateral innervation |
| Glossopharyngeal (IX) | Neither bilateral symmetry or contralateral innervation* |
| Vagus (X) | Bilateral symmetry |
Is vagus nerve contralateral or ipsilateral?
CRANIAL NERVES The 4 cranial nerves in the medulla are CN9-12: Glossopharyngeal (CN9): ipsilateral loss of pharyngeal sensation. Vagus (CN10): ipsilateral palatal weakness.
Does the oculomotor nerve Decussate?
The oculomotor nerve also controls the constriction of the pupils and thickening of the lens of the eye. Shining a light into one eye should result in equal constriction of the other eye. The neurons in the optic nerve decussate in the optic chiasm with some crossing to the contralateral optic nerve tract.