Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CNS Histology > Pons > Flashcards

Pons Flashcards

1
Q

Mention the longitudinal fibers

A

Corticospinal, corticonuclear, corticopontine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The transverse pontine fibers form……

A

Middle cerebellar peduncle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Function of the basis pontis

A

Considered a massive relay station, by which impulses from the cerebral cortex are transmitted to contralateral cerebellar hemisphere.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Mention contents of central tegmental tract

A

A) Descending fibers from the red nucleus in midbrain to the inferior olivary complex
B) ascending fibers from reticular formation of thalamic nuclei

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The intermediate acoustic stria arises from…..

A

Dorsal part of ventral cochlear nucleus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

…….runs transversely between basis pontis & tegmentum, derived from…..

A

Trapezoid
Ventral cochlear nucleus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The cochlear nerve originated from……nerve cells in….of inner ear. Their peripheral process end in relation to…..

A

Bipolar
Spiral ganglion
hair cells of organ if Corti

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

In auditory pathway, the axons of…..&……ascend mainly in ipsilateral lateral leminiscus

A

Superior olive & nuclei of the trapezoid body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Describe the tertiary auditory fibers

A

Lateral leminiscus ascends in the lateral part of tegmentum , most of its fibers end on inf colliculus some cross to inf colliculus of opposite side, the inf c. gives fibers to medial genifukate body of thalamus then these fibers project to auitory cortex.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The vestibular nerve nerve cells is in……, their peripheral processes recieve impulses from……

A

Vestibular ganglion
Hair cells of maculae of the utricle and saccules and crista ampularis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Compare 1ry & 2ry vestibular fibers

A

1ry, 1st order neuron (vestibular nerve) some project directly to cerebellum & remain 1ry
2ry, vestibulo-cerebellar fibers that arise from vestibular nuclei

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Describe postion of vestibular nuclei

A

Floor of 4th ventricle
A) superior & lateral nuclei are at inferior level of pons
B) inferior & medial nuclei are at level of open medulla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Describe efferents of vestibular nuclei

A

A) cerebellum: from medial & inferior nuclei
B) spinal cord from lateral vestibualr nucleus
C) MLF: from all vestibular nuclei, to motor nuclei of cranial nerves that supply extra-ocular muscles.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Describe components of medial longitudinal fasiculus

A

1) Ascending fibers: from medial & superior vestibular (crossed & uncrossed), that project to motor nuclei of 3rd, 4th & 6th. 6th connect with 3rd for conjugate eye movements.
2) Descending: vestibuloinal from medial vestibular, reticulospinal, tectospinal (descend to VII nucleus), interstitial nucleus of Cajal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Describe function of medial longitudinal fasiculus

A
  1. Coordination of reflex eye movements (tectospinal) and neck muscles in response to visual & auditory stimuli
  2. Control of conjugate eye movements
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Mention nuclei of facial nerve

A
  1. Motor nucleus of facial nerve
  2. Solitary nucleus
  3. Spinal nucleipus of V
  4. Superior salivatory nucleus
17
Q

Describe function & connections if motor nucleus of facial

A

Supply msucles of facial expression, posterior belly of digastric, platysma, stapedius, stylohyoid
Dorsal part of nucleus supplies upper face & recieves bilateral corticonuclear while ventral part which supplies lower face recieves contralateral.

18
Q

Mention role of following nuclei in CN VII:
1. superior salivatiry
2. Spinal n. of trigeminal
3. Solitary nucleus

A
  1. Parasymp , gives secretory fibers to submandibular, sublingual, lacrimal, nasal, buccal & palatine glands.
  2. Exteroceptive impulses from external auditory meatus & skin back to ear
  3. Gustatory part recives taste of ant 2/3 of tongue
19
Q

Function of abducent nucleus
Its fibers relay in….

A

Supply motor innervation to lateral rectus muscle of same side
Nucleus of III

20
Q

Mention nuclei of trigeminal nerve

A
  1. Main sensory nucleus (cont. with spinal nucleus)
  2. Spinal nucleus of trigeminal
  3. Mesencephalic nucleus extends from pons to upper midbrain level
  4. Motor nucleud of trigeminal nerve in cranial part of pons
21
Q

Describe the descending fibers of trigeminal nerve

A

The descend in spinal tract of trigeminal to end in spinal nucleus of trigeminal then cross to opposite side & form ventral trigemino-thalamic tract which ascends to VPMN then to sensory cortex.

22
Q

Describe the ascending fibers of trigeminal nerve

A

The ascend to end in main sensory nucleus then ascend in same or to opposite side & form dorsal trigemino-thalamic tract forms trigeminal leminiscus which ascends to VPMN then to sensory cortex.
Ascending fibers of proprioception go directly to mesencephalic nucleus (considered 1st order neuron)

23
Q

Describe connections of mesencephalic nucleus

A

A) Motor nucleus of trigeminal
B) Trigeminal leminiscus

24
Q

GR, Motor nucleus of trigeminal in connected to mesencephalic nucleus

A

To increase force of mastication

CNS Histology (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions