vestibulocochlear nerve, also called Auditory Nerve, Acoustic Nerve, or Eighth Cranial Nerve, nerve in the human ear, serving the organs of equilibrium and of hearing.
What is the location of the vestibulocochlear nerve?
Each vestibulocochlear nerve is found posterior to the origin of the facial nerves. They link the boundary between the pons and medulla oblongata, reaching sensory receptors of the internal ear, via the internal acoustic meatus, which also allows passage of the facial nerves.
What type of nerve is the accessory nerve?
The accessory nerve is a cranial nerve that supplies the sternocleidomastoid and trapezius muscles. It is considered as the eleventh of twelve pairs of cranial nerves, or simply cranial nerve XI, as part of it was formerly believed to originate in the brain.
Which part of the brain does the vestibulocochlear nerve emerge?
The vestibulocochlear nerve emerges from the ventrolateral margin of the brain stem near the junction of the medulla, pons, and cerebellum (the cerebellopontine angle).Which cranial nerve is the Vestibulocochlear or acoustic nerve?
The vestibulocochlear nerve, also known as cranial nerve eight (CN VIII), consists of the vestibular and cochlear nerves.
Where does the accessory nerve innervate?
Function of the accessory nerve The spinal accessory nerve is a purely motor entity. It innervates both the trapezius and the sternocleidomastoid muscles.
Where do first order neurons of the vestibulocochlear nerve terminate?
The central processes of these first-order neurons form the vestibular division of the vestibulocochlear (VIII) nerve and terminate in the vestibular complex in the dorsolateral medulla.
What nucleus of Vestibulocochlear nerve is Cochlear?
Nuclei. There are two special sensory cochlear nuclei and four special sensory vestibular nuclei located within the lower pons and upper medulla.What is Vestibulocochlear?
The vestibulocochlear nerve (auditory vestibular nerve), known as the eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain.
What are the 8 nerves?- Vestibular portion. Superior vestibular nerve. Supplies anterior/superior SCC, lateral SCC, utricle, and upper half of saccule. Inferior vestibular nerve. …
- Cochlear portion. Spiral ganglion. Cochlear nerve.
- Common Disorders. Acoustic_neuroma. Microvascular compression.
Where is located the body of the 3rd neuron of the vestibular nerve?
It arises from bipolar cells in the vestibular ganglion which is situated in the upper part of the outer end of the internal auditory meatus.
Where does the Abducens nerve cranial nerve VI originate?
Course. The abducens nerve originates from a set of neural cells that are found in the ventral aspect of the pons.
Where does the hypoglossal nerve innervate?
The hypoglossal nerve innervates all the intrinsic muscles and all but one of the extrinsic muscles (genioglossus, styloglossus, and hyoglossus) of the tongue. The function of each muscle/muscle group is as follows: Genioglossus- Draw the tongue forward from the root.
Is the Vestibulocochlear nerve sensory or motor?
No.NameSensory, motor, or bothVTrigeminalBoth sensory and motorVIAbducensMainly motorVIIFacialBoth sensory and motorVIIIVestibulocochlear In older texts: auditory, acoustic.Mostly sensory
What nerve innervates the deltoid?
After exiting the quadrangular space posteriorly, the anterior branch of the axillary nerve wraps around the surgical neck of the humerus, with the posterior humeral circumflex artery, to then innervate the deltoid muscle.
What does the Abducens nerve do?
The abducens nerve functions to innervate the ipsilateral lateral rectus muscle and partially innervate the contralateral medial rectus muscle (at the level of the nucleus – via the medial longitudinal fasciculus).
What are the 12 cranial nerve?
In higher vertebrates (reptiles, birds, mammals) there are 12 pairs of cranial nerves: olfactory (CN I), optic (CN II), oculomotor (CN III), trochlear (CN IV), trigeminal (CN V), abducent (or abducens; CN VI), facial (CN VII), vestibulocochlear (CN VIII), glossopharyngeal (CN IX), vagus (CN X), accessory (CN XI), and …
What is the 5th 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. They start in your brain and travel throughout your head.
What is 7th nerve?
Excerpt. The facial nerve is the seventh cranial nerve (CN VII). … The facial nerve provides motor innervation of facial muscles that are responsible for facial expression, parasympathetic innervation of the glands of the oral cavity and the lacrimal gland, and sensory innervation of the anterior two-thirds of the tongue …
Which extraocular muscle is innervated by each abducens nerve?
Organization of the several cranial nerve nuclei that govern eye movements, showing their innervation of the extraocular muscles. The abducens nucleus innervates the lateral rectus muscle; the trochlear nucleus innervates the superior oblique muscle; (more…)
Which Foramina do the abducens nerves pass through?
Cranial NerveForamenVI-Abducenssuperior orbital fissureVII-Facial (Major motor branches: Temporal, Zygomatic, Buccal, Mandibular, Cervical, and Posterior Auricular)internal acoustic meatus-> facial canal-> stylomastoid foramenfacial canal-> middle ear-> chorda tympani-> petrotympanic fissure
What causes abducens palsy?
Causes include an aneurysm, carcinomatous meningitis, procedure-related injury (e.g., spinal anesthesia, post-lumbar puncture), inflammatory lesions (e.g., sarcoid, lupus), infection (e.g., Lyme disease, syphilis, tuberculosis, Cryptococcus).
Is hypoglossal nerve a mixed nerve?
CN XII, Hypoglossal, innervates the muscles of the throat and enables us to swallow. Five cranial nerves have mixed sensory, motor and parasympathetic function.
What is hypoglossal canal?
The hypoglossal canal is located between the occipital condyle and jugular tubercle and runs obliquely forwards (posteromedial to anterolateral) allowing the hypoglossal nerve to exit the posterior cranial fossa.
What nerve innervates the sternocleidomastoid?
The muscles innervated directly by the XI nerve are the trapezius and the sternocleidomastoid, in addition to the laryngeal musculature (in collaboration with the vagus nerve), such as the palatal, pharyngeal, laryngeal muscles.
