Where are the nuclei for cranial nerves 1 and 2?
Where are the nuclei for cranial nerves 1 and 2?
The cranial nerve nuclei are a series of bilateral grey matter motor and sensory nuclei located in the midbrain, pons and medulla that are the collections of afferent and efferent cell bodies for many of the cranial nerves.
Where are the nuclei of the IV and VI CN?
Trochlear and abducens nerves
| Type | General somatic efferent (GSE) |
|---|---|
| Location of nuclei | Trochlear nerve (CN IV) – Level of the inferior colliculus Abducens nerve (CN VI) – Dorsal pons, the floor of 4th ventricle |
| Parts of nerve | Nucleus Intraparenchymal Cisternal Cavernous Intraocular |
What is the cranial nerve 6?
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).
Where is the nucleus of cranial nerve 1?
Special visceral efferent (motor) nuclei The motor nucleus of the trigeminal nerve: This cranial nucleus lies in the upper part of the pons, in the pons’ dorsal part. It is situated in the lateral part of the reticular formation, medial to the main sensory nucleus of the trigeminal nerve.
What is the function of the abducens and trochlear?
The trochlear (CN IV) and abducens (CN VI) nerves innervate the extraocular muscles that are responsible for positioning the eyeballs. The positioning ensures that the eyes can focus on a visual target.
What is the common purpose of the oculomotor trochlear and abducens cranial nerves?
The oculomotor, trochlear, and abducens nerves control actions of the intraocular (pupillary sphincter) and extraocular muscles. These nerves are observed for symmetry of eye movement, globe position, asymmetry or drooping of the eyelid (ptosis), and twitching or fluttering of the lids or globes.
Where is the nucleus of 6th cranial nerve?
pons
The abducens nucleus is the originating nucleus from which the abducens nerve (VI) emerges—a cranial nerve nucleus. This nucleus is located beneath the fourth ventricle in the caudal portion of the pons, medial to the sulcus limitans.
Where is the abducens nuclei?
The abducens nucleus is located internal to the facial colliculus and surrounded by the internal genu of the facial nerve (Fig. 14.1). This structure, in turn, is found in the floor of the rhomboid fossa just lateral to the median sulcus and rostral to the striae medullares of the fourth ventricle.
What does the 6th nerve control?
The sixth cranial nerve sends signals to your lateral rectus muscle. This is a small muscle that attaches to the outer side of your eye. When this muscle contracts, your eye moves away from your nose.
