What is the origin of the Vestibulocochlear nerve?

1 Origin. The vestibulocochlear nerve originates between the pons and the medulla oblongata, by two roots, vestibular and cochlear, emerging behind the facial nerve (VII) and in front of the inferior cerebellar peduncle.

Where does the vestibulocochlear nerve start and end?

The vestibulocochlear nerves originate in the monitoring receptors of the internal ear—the vestibule and cochlea. They pass through the internal acoustic meatus of the temporal bones, ending in the vestibular and cochlear nuclei of the pons and medulla oblongata.

Where does the cochlear nerve come from?

The cochlear nerve is primarily responsible for transmitting the electrical impulses generated for hearing and localization of sound. The nerve has its origin in the bipolar cells of the spiral ganglion of the cochlea, which is located adjacent to the inner margin of the bony spiral lamina.

Where is the vestibulocochlear nerve located?

internal auditory meatus

The vestibulocochlear nerve is located in the internal auditory meatus (internal auditory canal). The nerve is responsible for equilibrium and hearing. Conditions of the vestibulocochlear nerve include vestibular neuritis, labyrinthitis, and acoustic neuroma.

What was the vestibulocochlear nerve?

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.

Where is the 8th nerve?

The 8th cranial nerve runs between the base of the pons (the middle portion of the brainstem) and medulla oblongata (the lower portion of the brainstem). This junction between the pons, medulla, and cerebellum that contains the 8th nerve is called the cerebellopontine angle.

What is the nerve in the ear called?

Coming from the inner ear and running to the brain is the eighth cranial nerve, the auditory nerve. This nerve carries both balance and hearing information to the brain.

Is the vestibulocochlear nerve made up of hair cell axons?

The other two sensory organs supplied by the vestibular neurons are the maculae of the saccule and utricle. Hair cells of the maculae activate afferent receptors in response to linear acceleration. The vestibulocochlear nerve has axons that carry the modalities of hearing and equilibrium.

Where is the Perilymph found?


Perilymph is an extracellular fluid located within the inner ear. It is found within the scala tympani and scala vestibuli of the cochlea. The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid.

What axons make up the cochlear nerve?

The axons from the high-frequency region project to the dorsal portion of the anteroventral cochlear nucleus and the uppermost dorsal portions of the dorsal cochlear nucleus.
Cochlear nuclear complex

  • the dorsal cochlear nucleus (DCN)
  • the anteroventral cochlear nucleus (AVCN)
  • the posteroventral cochlear nucleus (PVCN)

What is nerve accessory?

The accessory nerve provides motor function (movement) to two muscles essential to neck and shoulder movement, the sternocleidomastoid (SCM) and the trapezius, as well as to the larynx (voice box) and other structures in the throat. It’s the 11th of the 12 cranial nerves and is often referred to as CN XI.

How is the abducens nerve cranial nerve VI classified?

Cranial nerve III, IV, and VI (oculomotor, trochlear, and abducens nerves, respectively) are general somatic efferent (GSE) nerves responsible for innervating the extraocular muscles within the orbit.

What nerve connects the tongue to the brain?

The hypoglossal nerve

The hypoglossal nerve is one of 12 cranial nerves. It’s also known as the 12th cranial nerve, cranial nerve 12 or CNXII. This nerve starts at the base of your brain. It travels down your neck and branches out, ending at the base and underside of your tongue.

Which nerve does not play a role in swallowing?

The glossopharyngeal nerve is the main center for swallowing, however, but all three play a role together (along with the facial, trigeminal, and spinal accessory). The olfactory nerve does NOT.

What nerve controls taste?

The facial nerve (CN VII) innervates the anterior two thirds of the tongue, the glossopharyngeal nerve (CN IX) innervates the posterior one third of the tongue, and the vagal nerve (CN X) carries taste information from the back part of the mouth, including the upper third of the esophagus.

Is the accessory nerve sensory or motor?

motor nerve

The spinal accessory nerve is the eleventh cranial nerve. It is a motor nerve (somatic motor) innervating two muscles—the sternocleidomastoid and trapezius.

Why is it called 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.

Accessory nerve
FMA 6720
Anatomical terms of neuroanatomy

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 the origin of sternocleidomastoid?

Sternocleidomastoid muscle

Origin Manubrium and medial portion of the clavicle
Insertion Mastoid process of the temporal bone, superior nuchal line
Artery Occipital artery and the superior thyroid artery
Nerve Motor: spinal accessory nerve sensory: cervical plexus Proprioceptive: ventral rami of C2-3

What is the origin of the splenius capitis muscle?

Splenius capitis muscle

Origin Spinous processes of vertebrae C7-T3, nuchal ligament
Insertion Lateral superior nuchal line of occipital bone, mastoid process of temporal bone
Action Bilateral contraction: Extends head/neck Unilateral contraction: Lateral flexion and rotation of head (ipsilateral)

Which is the origin of the Semispinalis capitis?

Semispinalis capitis muscle

Origin Articular processes of vertebrae C4-C7, transverse processes of vertebrae T1-T6
Insertion Between superior and inferior nuchal lines of occipital bone

What is the origin of the trapezius muscle?

It originates on the occipital bone, the ligamentum nuchae, and the spinous processes of T01–T12. The trapezius inserts on the lateral third of the clavicle, as well as the acromion and scapular spine of the scapula.

What is the origin of the deltoid muscle?

Deltoid muscle

Origins Lateral 1/3 of Clavicle (clavicular part), Acromion (acromial part), Spine of Scapula (spinal part) Mnemonic: ‘Deltoid helps you carry SACS’
Insertion Deltoid tuberosity of humerus
Innervation Axillary nerve (C5, C6)

What is the origin of the trapezius quizlet?

The base of the scull at the medial third of the superior nuchai line and the external occipital protuberance. And from the Ligamentum nuchae and the spinous process of the thoracic verebrae.

Which is a part of the origin of the adductor magnus quizlet?

What is the origin of the Adductor Magnus? 2. This muscle originates on the anterior pubis and inserts on the medial, proximal tibia, and is an adductor.

What is the origin of the biceps Brachii quizlet?

What is the origin of the Biceps brachii muscle? Long head originates from tubercle above Glenoid cavity of scapula.