Of all the cranial nerves, the abducens nerve has the longest intracranial course. It is located in the pons at the floor of the fourth ventricle, at the same level as the facial colliculus. In fact, the axons of the facial nerve loop around the posterior aspect of the abducens nucleus. This will be of clinical significance later.
The numbering of the cranial nerves is based on the order in which they emerge from the brain, front to back (brainstem). The terminal nerves, olfactory nerves (I) and optic nerves (II) emerge from the cerebrum or forebrain, and the remaining ten pairs arise from the brainstem, which is the lower part of the brain.
The cranial nerves emerge from the central nervous system above this level. Each cranial nerve is paired and is present on both sides. The numbering of the cranial nerves is based on the order in which they emerge from the brain, front to back (brainstem).
Cranial nerve six (CN VI), also known as the abducens nerve, is one of the nerves responsible for the extraocular motor functions of the eye, along with the oculomotor nerve (CN III) and the trochlear nerve (CN IV). NCBI Skip to main content Skip to navigation Resources
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.
The longest cranial nerve is the vagus nerve. Your vagus nerve has both sensory and motor functions. It runs through many parts of your body, including your tongue, throat, heart and digestive system.
The vagus nerve has the most extensive distribution of the cranial nerves.
- The trochlear nerve is the smallest cranial nerve. It is the fourth cranial nerve. Emerging from the brain, it has the shortest course as it terminates by innervating a muscle present in the eye.
The sciatic nerveThe sciatic nerve is the longest, largest nerve in your body. Your sciatic nerve roots start in your lower back and run down the back of each leg.
the abducens nerveOf all the cranial nerves, the abducens nerve has the second longest intracranial course. It is located in the pons at the floor of the fourth ventricle, at the same level as the facial colliculus. In fact, the axons of the facial nerve loop around the posterior aspect of the abducens nucleus.
CardsTerm How many bones in the cuneiform bones?Definition 3Term Largest of the cranial nerve; Chief sensory nerve of the face; Serve as the motor nerve of the muscles that control chewing.Definition Fifth Cranial Nerve (Trifacial Nerve / Trigeminal Nerve)231 more rows•Dec 6, 2010
The optic nerve is the second cranial nerve (CN II) responsible for transmitting visual information. The optic nerve contains only afferent (sensory) fibers, and like all cranial nerves is paired.
Introduction. The accessory spinal nerve or XI cranial nerve is essential for neck and shoulder movement, the intrinsic musculature of the larynx, and the sensitive afferences of the trapezius and sternocleidomastoid musculature.
Largest Cranial Nerve – Trigeminal nerve (5th Cranial nerve) Smallest cranial nerve – Trochlear Nerve (4th Cranial nerve)
The trigeminal nerve (V) is the largest cranial nerve, and it has both a sensory and a motor division. The motor division of the trigeminal nerve, which has its own nucleus located in the pons, innervates the “muscles of mastication” and also the tensor muscle of the tympanic membranes of the ear.
The trochlear nerveDetailed Solution. Option 1 is correct: The trochlear nerve is the fourth cranial nerve (CN IV) and one of the ocular motor nerves that control eye movement. The trochlear nerve is the smallest nerve of the human body.