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D1S U1 Neuroanatomy > 4 CN V And VII > Flashcards

4 CN V And VII Flashcards

1
Q

Three divisions of CN V:

A
  1. Ophthalmic (Vi/V1)- sensory
  2. Maxillary (Vii/V2)- sensory
  3. Mandibular (Viii/V3)- sensory and motor
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2
Q

CN V:

  1. Axon type
  2. CNS origin/termination 3. Peripheral origin/termination
A
  1. GSA
  2. Spinal and Main sensory nuclei
  3. Skin and deep tissues of head, dura
  4. Mesencephalic nucleus
  5. Muscle spindles, mechanoreceptors, proprioception
  6. SVE
  7. Trigeminal motor nucleus
  8. MOM and tensor twins
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3
Q

Near CN V motor nucleus, actually part of reticular formation, pattern generator for masticatory rhythm.

A

Supratrigeminal nucleus

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4
Q

One function of this nucleus is it controls the distance between mandible and maxilla

A

Mesencephalic nucleus

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5
Q

This nucleus senses discriminative touch and vibration on the face, oral cavity, meninges.

A

Main Sensory Nucleus

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6
Q

This nucleus senses pain, crude touch, temperature on the face, oral cavity, meninges.

A

Spinal Trigeminal Nucleus

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7
Q

The mesencephalic nucleus is homologous with the _____ of the brainstem.
Main/Principal/Chief sensory nucleus homologous with ______.
Spinal nucleus is _____ myelinated and is homologous with ______.

A 
Posterior column (medial lemniscus)
Posterior column (medial lemniscus)

Lightly
Anterolateral (STT) system

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8
Q

The ascending projection of the spinal nucleus is ___lateral and terminates in the ______.

The ascending projection of the main sensory nucleus is ___lateral and terminates in the ______.

A

Contralateral
VPM

Bilateral
VPM

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9
Q

The more _____ the spinal trigeminal tract (pars caudalis) injury, the larger the area around the mouth that is SPARED of sensory loss. This is because of the inverted, onion peel distribution of sensory neurons.

A

Caudal

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10
Q

CN VII Overview:

1. Axon 2. CNS origin/termination 3. Peripheral origin/termination

A
  1. GSA 2. Spinal Trigeminal nucleus, geniculate gangion 3. Ear skin
  2. SSA 2. Nucleus of solitary tract, geniculate ganglion 3. Taste buds ant. 2/3 tongue, nasal cavity and soft palate
  3. GVE 2. Superior salivatory nucleus, submand and pterygopalatine ganglia 3. Submand, sublingual, nasal, palatine, lacrimal glands.
  4. SVE 2. Facial motor nucleus 3. Muscles of facial expression, stapedius
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11
Q

Lesions on the _____ pathway results in inability to smile but unaffected ability to raise eyebrows.

A

Corticobulbar

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12
Q

Brief episodes of excruciating pain in distribution of one division of trigeminal nerve. No sensory trouble between attacks. Usually due to compression by a vessel/tumor. Treated by meds, cutting nerve root to lose all tactile sensation in area, or microvascular decompression.

A

Trigeminal neuralgia

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13
Q

Unilateral facial paralysis due to CN VII dysfunction. Most common cause of acute facial nerve paralysis.

A

Bell’s Palsy

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14
Q

Corneal blink reflex (touch cornea, both eyes blink):
Afferent limb ____

Efferent limb ____

A

Vi (Ophthalmic) to Spinal V tract

VII by bilateral projection from SpV

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15
Q 
Jaw opening (food contact with oral membrane)/closing (pain) reflexes:
Input from \_\_\_\_

Output from ____

A

CN V
Proprioception (Trigeminal mesencephalic nucleus)
Food (trigeminal main nucleus)
Pain (trigeminal spinal nucleus)

CN V
MOM

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16
Q

Jaw-jerk reflex (monosynaptic reflex, downward tap on chin stretches masseter):
Afferent limb ____

Efferent limb ____

A

Mesencephalic V neuron (masseter spindle)

V motor neuron

17
Q

Blink to light reflex ->

  1. Receptor
  2. Afferent
  3. 1st synapse
  4. 2nd synapse
  5. Muscle
A
  1. Retina
  2. Optic nerve (II)
  3. Superior Colliculus
  4. Facial motor nucleus
  5. Orbicularis oculi
18
Q

Blink to noise reflex ->

  1. Receptor
  2. Afferent
  3. 1st synapse
  4. 2nd synapse
  5. Muscle
A
  1. Cochlea
  2. Cochlear nucleus (VIII)
  3. Inferior Colliculus
  4. Facial motor nucleus
  5. Orbicularis oculi
19
Q

Sound attenuation reflex:

  1. Receptor
  2. Afferent
  3. 1st synapse
  4. 2nd synapse
  5. Muscle
A
  1. Cochlea
  2. Cochlear nucleus (VIII)
  3. Superior Olivary nucleus (pons)
  4. Facial motor nucleus
  5. Stapedius
20
Q

Gustatory (taste) afferent travel via the _____ tract to reach its nucleus. Second order fibers do 2 things: reflex activities (swallowing, salivation); project uncrossed to ____ then to gustatory cortex (insula)

A

Solitary tract

VPM (thalamus)

D1S U1 Neuroanatomy (8 decks)

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