Brainscape's Knowledge GenomeTM

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


See full index

NE Exam 2 > Somatosensory Tracts: Facial Sensation > Flashcards

Somatosensory Tracts: Facial Sensation Flashcards

1
Q

Where does the Trigeminal N emerge from?

A

Midpons

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

Location of Trigeminal Ganglion:

A

Middle cranial fossa

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

4 cranial nerve nuclei associated with the Trigeminal N:

A

(1) Chief Sensory Nucleus
(2) Spinal Trigeminal Nucleus
(3) Tract of V
(4) Mesencephalic
(5) Motor Nucleus of V

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

Chief Sensory Nucleus

A
  • General Somatic Information
  • Processes discriminative touch, pressure, vibration and conscious proprioception
  • Located in midpons
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Spinal Nucleus and Tract of V

A

Processes pain and temperature

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

Mesencephalic Nucleus of V

A
  • Located in midbrain
  • Processes non-conscious proprioceptive information
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Motor Nucleus of V

A
  • Special visceral efferent
  • Muscles of mastication
  • Derived from first branchial arch
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Mesencephalic Nucleus of V receives afferents from:

A

Muscle spindles of muscles of mastication, periodontal ligaments of the teeth, and the TMJ

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

Nucleus that prevents biting down too hard:

A

Mesencephalic Nucleus of V

(relays non-conscious proprioceptive information about the position of the jaw)

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

Only structure in the CNS that contains the cells bodies of the first order sensory neurons:

A

Mesencephalic Nucleus

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

Central processes from Mesencephalic Nucleus of V travel to:

A

Reticular formation, cerebellum, Motor Nucleus of V

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

Jaw-Jerk Reflex

A

(1) Chin is tapped causing stimulation of proprioceptors
(2) Project to Mesencephalic Nucleus
(3) Fibers project to synapse in the Motor Nucleus of V
(4) Motor fibers innervate the muscles of mastication
(5) Occlusion of the jaw

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

Clinical Relevance of Jaw-Jerk Reflex

A

This reflex can be tested to assess the function of these brainstem nuclei (mesencephalic, motor) and the third branch of the Trigeminal N which carries these fibers

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

Spinal Trigeminal Nucleus / Spinal Nucleus of V

A
  • Pain and temperature fibers from the periphery have their cell bodies in the trigeminal ganglion, and their central processes enter the brainstem thru the sensory root of V in the midpons; fibers descend into spinal trigeminal tract and synapse in the spinal nucleus of V (ONLY instance in which sensory fibers descend upon entering the brainstem)
  • 2nd order neurons travel in the contralateral trigeminothalamic tract; collaterals to pain-modulating systems terminate in the VPM of the Thalamus
  • VPM –> Posterior limb –> face area of primary somatosensory cortex
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Corneal (Blink) Reflex: Afferent Limb

A

Pain and touch receptors in cornea –> opthalmic nerve –> terminate centrally in ipsilateral spinal trigeminal nucleus –> trigeminothalamic tract sends bilateral collaterals to facial motor nucleus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Cornreal (Blink) Reflex: Efferent Limb

A

Facial nerve fibers –> stimulate orbicularis occuli bilaterally –> eyes blink

17
Q

3 Parts of the Spinal Nucleus of V:

A

(1) Pars Caudalis
(2) Pars Interpolarais
(3) Pars Oralis

18
Q

Lateral Medullary Syndrome: Occluded Artery

A

PICA – sometimes due to occlusion of vertebral artery at origin of PICA

19
Q

Lateral Medullary Syndrome results in damage to:

A

Spinal Trigeminal Tract and Nucleus

20
Q

Lateral Medullary Syndrome: Symptoms

A
  • Ipsilateral loss of pain and thermal sense on face and in oral cavity
  • Contralateral loss of pain and temperature sensation from body
21
Q

Proprioception is conveyed through the ____ ___ ____ and is perceived as:

A
  • Principal Sensory Nucleus
  • Pressure of displacement but not pain
22
Q

Lesion of Spinothalamic Tract: Symptoms

A

Loss of pain and temperature sensation on contralateral side of body

23
Q

Disruption of PICA: Ipsilateral Spinocerebellar Tract Lesion

A
  • Can occur as the tract travels thru lateral medulla or as it enters the cerebellum via inferior cerebellar peduncle
  • Results in gait ataxia
24
Q

Horner Syndrome

A
  • Lesion of descending sympathetic fibers that travel in lateral tegmentum of brainstem
  • Ipsilateral ptosis, miosis, and anhidrosis
25
Q

Lesion of Vesitbular Nuclei

A
  • Occurs in posterior area of medulla
  • Vertigo, nausea, nystagmus
26
Q

Lesion of Nucleus Ambiguus

A

Dysarthria and dysphagia

27
Q

Lateral Pontine Syndrome: Cause

A

Occlusion of long circumferential branches of Basilar A

28
Q

Lateral Pontine Syndrome: Damage to Spinal Trigeminal Tract and Nucleus

A

Ipsilateral loss of pain and temperature sensation from face

29
Q

Lateral Pontine Syndrome: Damage to Trigeminal Motor Nucleus

A
  • Lesion at midpontine level
  • Ipsilateral paralysis of masticatory muscles
30
Q

Another name for Central Midbrain lesion

A

Claude Syndrome

31
Q

Claude Syndrome

A
  • Occurs if lesion extends laterally into the Ventral Trigeminothalamic fibers
  • Results in partial loss of pain and thermal sensation from contralateral face
32
Q

Indications of lesion of trigeminal ganglion or nerve proximal to ganglion

A

(1) Loss of pain/temperature/tactile sensation in ipsilateral face, oral cavity, and teeth
(2) Ipsilateral paralysis of masticatory muscles
(3) Ipsilateral loss of corneal reflex

33
Q

Causes of damage to peripheral portions trigeminal nerve

A
  • Traumatic (fracture)
  • Inflammatory
  • Tumor growth
34
Q

Another name for trigeminal neuralgia

A

Tic Douloureux

35
Q

Trigeminal Neuralgia: Probable Cause

A
  • Compression of trigeminal root
  • Commonly occurs at loop of superior cerebellar A
36
Q

Which artery supplies the spinal trigeminal tract and ALS in the medulla?

A

PICA

37
Q

PICA Syndrome

A
  • Alternating hemianesthesia
  • Loss of pain and thermal sensations on one side of the body and opposite side of the face
38
Q

Pontine Gliomas: Symptoms

A
  • If damage of Motor Trigeminal – paralysis of masticatory muscles
  • If damage to Principal Sensory Nucleus – loss of tactile input

NE Exam 2 (19 decks)

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