Vestibulocochlear CN Flashcards
Where does the Vestibulocochlear nerve exit the cranium?
Via internal acoustic meatus of the temporal bone.
Where does the vestibulocochlear nerve divide into the vestibular and the cochlear nerve?
after exiting via the internal acoustic meatus.
Where are the vestibular nerve cell bodies found?
In the vestibular ganglion
How many vestibular nuclei are there in the lower pons/upper medulla?
- superior
- inferior
- medial
- lateral vestibular nuclei.
WHere are the cochlear nerve cell bodies situated?
They are localized in the cochlear/spiral ganglion, in the spiral canal of the modiolus in the cochlea.
Where are the terminal endings of the cochlear nerve?
In the spiral organ of Corti.
How many cochlear nuclei are there and where are they situated?
The anterior and posterior cochlear nuclei are both localized in the brainstem.
WHere is the primary auditory cortex situated?
In the temporal lobe.
In the lateral corner of which region of the brainstem are the vestibular nuclei placed?
Rhomboid fossa of fourth ventricle
What nerves pass through the internal auditory meatus?
- vestibulocochlear
- Facial nerve
- Sensory root of facial nerve
What major associative pathway of the brainsteminfluences movement of the neck and upper limbs in response to stimuli from the vestibular nuclei?
Medial longitudinal fasciculus
To what structure does the cochlear fibers merge to form at the level of the superior olivary nucleus?
The lateral lemniscus
To where does the lateral lemniscus carry auditory information?
To the inferior nucleus
How is the reticular formation and the vestibular nuclei connected?
The vestibular nuclei share multiple connections with the gray matter of the spinal cord, oculogyric nuclei (the nuclei of the CN III, IV and VI), the reticular formation and the cerebellum.
