Sheet 8

Question 1

What passes through the central gray matter (From medial to lateral)?

Answer 1

1) Hypoglossal nucleus
2) Dorsal nucleus of vagus
3) Solitary nucleus
4) Vestibular nuclei (medial and inferior)

Question 2

Which nerve is purely motor?

Answer 2

Hypoglossal nerve

Question 3

Which nucleus is a parasympathetic nucleus?

Answer 3

Dorsal vagal nucleus

Question 4

Which nucleus is sensory for taste and visceral sensation?

Answer 4

Solitary nucleus (Nucleus of tractus solitarius)

Question 5

Acoustic pathway:

Answer 5

Cochlea -> Brainstem (PM junction) -> A&P cochlear nuclei [Synapse] -> Cross the midline [Trapezoid Body] -> Ascend to lateral lemniscus -> To inferior colliculi -> Medial genticulate body (thalamus) -> Cortex (Temporal lobe)

Question 6

What is found in the caudal section of the pons? (Tegmentum)

Answer 6

1) Medial lemniscus (most A)
2) Medial longitudinal fasciculus
3) Part of Reticular formation
4) Spinal nucleus of Trigeminal
5) Part of superior & middle cerebellar peduncle
6) CN 6,7,8 nuclei

Question 7

What is found in the caudal and cranial section of the pons? (Basillar)

Answer 7

1) Transverse Pontine fibers (middle cerebellar)
2) Pontine nuclei
3) Bundles of CS-T

Question 8

What is found in the cranial section of the pons? (Tegmentum)

Answer 8

1) Inferior and middle cerebellar peduncle
2) Spinal lemniscus & Lateral lemniscus
3) Motor nuclei of Trigeminal (in RF)
4) Principle sensory nuclei

Question 9

What is the Trigeminal pathway?

Answer 9

Cell bodies of 1st order neurons in Trigeminal ganglia -> Principle and spinal nuclei of Trigeminal [Synapse] -> Cross the midline [Trigeminal lemniscus] -> Thalamus (VPM)