pons Flashcards
study and recite all parts of pons
where is the pons
it is a part of the brain stem that lies between the medulla below and the midbrain above
what are the parts of pons
a ventral part : basis pontis
a dorsal part : tegmentum
what are the external features present on the ventral part of pons
1) basillar groove
2) transverse pontine fibers
3) middle 4 cranial nerves
what does the ventral surface of the pons called
basis pontis or basillar surface
what is the basillar groove
it is a shallow median groove that lodges the basillar artery
what are the transverse pontine fibers
they are thick ridges that collects on either sides forming the middle cerebellar peduncle connecting the pons with the cerebellum
what are the names of the middle 4 cranial nerves related to pons
trigeminal nerve
abducent nerve
facial nerve
vestibulo-cochlear nerve
what is the nature of trigeminal nerve
it has a large sensory lateral rootand a small motor medial root
from where does the trigeminal nerve emerge
it emerges from the lateral part of the front of the pons close to its upper border
where does the abducent nerve exit from
it exits from the sulcus between the pyramid and the pons
from where do facial and vestibulo cochlear nerves exit
they exit from the cerebello pontine angle
what is the cerebellopontine angle
it is an angle formed by middle and inferior cerebellar peduncles when they meet to enter the cerebellum
what is the name of the dorsal surface of pons
tegmental surface
by what the tegmentum bounded on the sides
bounded on either sides by superior cerebellar peduncles
what seperates the back of pons from the back of open medulla
medullary stria
