Pons

Question 1

Connects the medulla oblongata to the midbrain

Answer 1

Pons

Question 2

Important ascending and descending tracts of Pons

Answer 2

Corticonuclear
Corticopontine
Corticospinal
Medial longitudinal fasciculus
Medial, Spinal, and Lateral Menisci

Question 3

Pons cranial nerves

Answer 3

Trigeminal - 5
Abducent - 6
Facial - 7
Vestibulocochlear - 8

Question 4

Convex from side to side and shows many transverse fiver that converge on each side to form the _______

Answer 4

Middle cerebellar peduncle

Question 5

A shallow groove in the midline found on the anterior surface which lodges the basilar artery

Answer 5

Basilar groove

Question 6

Nerve that emerges on each side of the anterolateral surface.

Answer 6

Trigeminal nerve

Question 7

The trigeminal nerve contains 2 roots. What is the size and laterality of each root.

Answer 7

Motor - smaller and medial

Sensory - larger and lateral

Question 8

CN 6-8 emerge from?

Answer 8

groove between the pons and cerebellum

Question 9

Pons are limited laterally by the __________ and divided symmetrically by a ___________.

Answer 9

Superior cerebellar peduncles

Median sulcus

Question 10

An elongated elevation located laterally to the median sulcus

Answer 10

Medial eminence

Question 11

Medial eminence is bounded laterally by ______

Answer 11

Sulcus limitans

Question 12

Formed from the slight expansion of the inferior end of the medial eminence

Answer 12

Facial colliculus

Question 13

2 cranial nerve roots responsible for the facial colliculus

Answer 13

root of the facial nerve winding around the nucleus of the abducent nerve

Question 14

Floor of the superior part of the sulcus limitans which is bluish-gray in color due to the pigmented nerve cells

Answer 14

Substansia ferruginea

Question 15

Located lateral to the sulcus limitans

Answer 15

Area vestibuli

Question 16

Area vestibuli is produced by the underlying _______

Answer 16

vestibular nuclei

Question 17

o Rotates as it passes from the medulla into the
pons
o Situated in the most anterior part of the tegmentum, with its long axis running transversely
o Accompanied by the spinal and lateral lemnisci

Answer 17

Medial lemniscus

Question 18

o Lies posterior to the lateral part of the medial lemniscus; fibers wind around the nucleus of the abducent nerve, producing the facial colliculus.
o The fibers then pass anteriorly between the facial nucleus and the superior end of the nucleus of the spinal tract of the trigeminal nerve

Answer 18

Facial nucleus

Question 19

o Situated beneath the floor of the fourth ventricle on either side of the midline
o Main pathway that connects the vestibular and cochlear nuclei with the nuclei controlling the extraocular muscles (oculomotor, trochlear, and abducent nuclei)

Answer 19

Medial longitudinal fasciculus

Question 20

o Situated lateral to the abducent nucleus and is in close relationship to the inferior cerebellar
peduncle
o The superior part of the lateral and the inferior part of the superior vestibular nucleus, the posterior and anterior cochlear nuclei are also found at this level

Answer 20

Medial vestibular nucleus

Question 21

Lie on the anteromedial aspect of the inferior cerebellar peduncle

Answer 21

Spinal nucleus of the trigeminal nerve and its tract

Question 22

o Made up of fibers derived from the cochlear nuclei and the nuclei of the trapezoid body
o Run transversely in the anterior part of the tegmentum

Answer 22

Trapezoid body

Question 23

o Small masses of nerve cells located at the basilar part of the pons
o Where the corticopontine fibers of the crus cerebri terminate

Answer 23

Pontine nuclei

Question 24

o The axons of these cells give origin to the transverse fibers of the pons, which cross the midline and intersect the corticospinal and corticonuclear tracts, which breaks them up into small bundles.

Answer 24

Pontine nuclei

Question 25

o Situated beneath the lateral part of the fourth ventricle within the reticular formation
o The emerging motor fibers travel anteriorly through the substance of the pons and exit on its anterior surface.

Answer 25

Motor nucleus of the trigeminal nerve

Question 26

o Situated on the lateral side of the motor nucleus
o Continuous inferiorly with the nucleus of the spinal tract
o The entering sensory fibers travel through the substance of the pons and lie lateral to the motor fibers.

Answer 26

Principal sensory nucleus of the trigeminal nerve

Question 27

o Situated posterolateral to the motor nucleus of the trigeminal nerve
o It is joined by the anterior spinocerebellar tract.

Answer 27

Superior cerebellar peduncle

Question 28

Lie at the lateral extremity of the medial lemniscus

Answer 28

Lateral and Spinal lemnisci

Question 29

Blood supply of the pons

Answer 29

Basilar artery

Question 30

Branches of basilar artery

Answer 30

o Pontine arteries
o Anterior Inferior Cerebellar Artery
o Superior Cerebellar Artery