Table of Contents
What number is the trochlear nerve?
Neuroanatomy, Cranial Nerve 4 (Trochlear)
What nerve is located here in number 2?
Optic Nerve
Cranial Nerves
| Number | Name | Function |
|---|---|---|
| II | Optic Nerve | Vision |
| III | Oculomotor Nerve | Eye movement; pupil constriction |
| IV | Trochlear Nerve | Eye movement |
| V | Trigeminal Nerve | Somatosensory information (touch, pain) from the face and head; muscles for chewing. |
What are the trochlear nerves?
The trochlear nerve is one of 12 sets of cranial nerves. It enables movement in the eye’s superior oblique muscle. This makes it possible to look down. The nerve also enables you to move your eyes toward your nose or away from it.
What type of nerve is the trochlear nerve?
Description. The trochlear nerve is the fourth Cranial Nerve (CNIV) with the longest intracranial course, but also the thinnest. It has a general somatic efferent (somatic motor) nerve, which innervates a single muscle (superior oblique muscle) on the contralateral side of its origin.
Where is the 4th nerve?
The fourth cranial nerve is the only cranial nerve that starts at the back of the brain. It has a longer path through the skull than any other cranial nerve. It enters the eye socket through an opening at the back and then travels to the superior oblique muscle.
What is the 3rd cranial nerve?
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.
Which is the fifth cranial nerve?
The trigeminal nerve
The trigeminal nerve, also called the cranial nerve V (that’s the Roman numeral five), is the fifth of 12 cranial nerves. You have two trigeminal nerves, one on each side of your body.
What is the 12th cranial nerve?
The Hypoglossal Nerve is the 12th Cranial Nerve (Cranial Nerve XII). It is mainly an efferent nerve for the tongue musculature. The nerve originates from the medulla and travels caudally and dorsally to the tongue.
What is the trochlear nerve?
The trochlear nerve is one of 12 sets of cranial nerves. It is part of the autonomic nervous system, which supplies (innervates) many of your organs, including the eyes. This nerve is the fourth set of cranial nerves (CN IV or cranial nerve 4). It is a motor nerve that sends signals from the brain to the muscles.
How do you test the trochlear nerve?
The trochlear nerve is tested by examining the action of its muscle, the superior oblique. When acting on its own this muscle depresses and abducts the eyeball. However, movements of the eye by the extraocular muscles are synergistic (working together).
What happens if your trochlear nerve is damaged?
The trochlear nerve is fragile. Protecting your head from injury can help keep your trochlear nerve safe. Minor head injuries and more severe ones from trauma can cause fourth nerve palsy. This condition can cause double vision, crossed eyes and more. Depending on the cause, symptoms may go away on their own.