What is the 8th facial nerve?

What is the 8th facial nerve?

The vestibulocochlear nerve, also known as cranial nerve eight (CN VIII), consists of the vestibular and cochlear nerves. Each nerve has distinct nuclei within the brainstem.

Which cranial nerves have sensory afferents?

Cranial nerve VIII, the vestibulocochlear nerve, is responsible for the auditory sense and the vestibular sense of orientation of the head. This nerve conveys special sensory afferents (SSA) from the inner ear to the cochlear nuclei and the vestibular nuclei in the caudal medulla oblongata.

How do you check cranial nerve VIII?

8th Cranial nerve

1. Hearing is first tested in each ear by whispering something while occluding the opposite ear.
2. Vestibular function can be evaluated by testing for nystagmus Nystagmus Earache, hearing loss, otorrhea, tinnitus, and vertigo are the principal symptoms of ear problems.

Which cranial nerve is identified by the arrow?

What cranial nerve is indicated by the orange arrow? CN XI, the Spinal Accessory Nerve.

Where is the balance nerve?

The cell bodies of the vestibular nerve are located in the vestibular ganglion which is housed in the outer part of the internal acoustic meatus. Information about the position of the head is used to coordinate balance and the vestibulo-ocular reflex.

What is 7th nerve?

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.

Is cranial nerve 8 sensory or motor?

Table of cranial nerves

No.	Name	Sensory, motor, or both
VII	Facial	Both sensory and motor
VIII	Vestibulocochlear In older texts: auditory, acoustic.	Mostly sensory
IX	Glossopharyngeal	Both sensory and motor
X	Vagus	Both sensory and motor

Which cranial nerve sends balance sensations to the brain?

vestibulocochlear nerve: Also known as the auditory vestibular nerve, this is the eighth of twelve cranial nerves, and it is responsible for transmitting sound and equilibrium (balance) information from the inner ear to the brain.

What nerve affects balance?

What is vestibular neuritis? Vestibular neuritis is a disorder that affects the nerve of the inner ear called the vestibulocochlear nerve. This nerve sends balance and head position information from the inner ear to the brain.

Which cranial nerve is responsible for smell?

Cranial Nerve
Neuroanatomy, Cranial Nerve 1 (Olfactory)

Which is the largest cranial nerve?

The vagus nerve (cranial nerve [CN] X) is the longest cranial nerve in the body, containing both motor and sensory functions in both the afferent and efferent regards.

Where are the VII and VIII cranial nerves located?

VII,VIII CRANIAL NERVES. These innervate the buccinator, the orbicularis oris and the nasolabial muscles. The dorsal and ventral buccal branches receive GSA fibers through communicating branches of the auriculotemporal nerve and mylohyoid nerves respectively (these nerves are branches of the mandibular nerve).

Is the vagus nerve part of the facial nerve?

The facial nerve is joined by the auricular branch of the vagus nerve. This leaves the vagus nerve at the level of the jugular foramen and constitute the lateral internal auricular nerve (a branch of the facial nerve) that innervates the external ear canal.

Which is the 9th nerve in the human body?

The glossopharyngeal nerve is the 9th cranial nerve (CN IX). It is one of the four cranial nerves that has sensory, motor, and parasympathetic functions.

What are the symptoms of CN VIII injury?

CN VIII injuries are the result of pathological processes or injuries that commonly involve the cerebellopontine angle (CPA), the internal auditory canal (IAC), or the inner ear. In such cases, symptoms such as vertigo, nystagmus, tinnitus, and sensorineural hearing loss may occur.