Cranial nerve V (Trigeminal nerve) Flashcards Preview

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Flashcards in Cranial nerve V (Trigeminal nerve) Deck (10)
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1
Q

What is CN V

What are the main functions of this nerve

A

Trigeminal nerve

Sensory, Motor only

2
Q

Where is the trigeminal nerve found in the brainstem

A

Roots found at lateral pons

Largest nerve with sensory and motor function

3
Q

What are the functions of the trigeminal nerve

A
Sensory for face
Motor for mastication
-masseter
-temporal
-pterygoid
-digastric
4
Q

What is the name of the main sensory nucleus associated with the trigeminal nerve
What are the 3 subdivisions of nuclei found here

What is the name of the other nucleus associated with the trigeminal nerve

A

Sensory nucleus of V from trigeminal ganglion outside BS

  • Mesencephalic (at level of superior colliculus)
  • Chief
  • Spinal (at level of spinal cord and medulla oblongata)

Motor nucleus (at level of chief nucleus in the pons)

5
Q

What are the 3 subdivisions of the sensory trigeminal nerve

What areas do they innervate

A

Ophthalmic division => opthalmic nerve

  • forehead
  • nasal cavity

Maxillary division => maxillary nerve

  • cheek
  • nasal cavity
  • teeth, upper lip

Mandibular division => mandibular nerve

  • Lower lip
  • chin, jaw
  • External ear
6
Q

Describe the sensory pathway of the Ab fibres into the sensory nucleus

A

Ab fibres pass via trigeminal ganglion and receive
-discriminative touch => chief nucleus

2nd order neurones to thalamus via medial leminiscus with gracilis and cuneate

Synapse with cerebral cortex

7
Q

Describe the sensory pathway of thin Ad and C fibres into the sensory nucleus

A

Thin Ad, C fibres via trigeminal ganglion and receive
-pain and temp sensation => spinal nuclei

2nd order neurones to thalamus via spinothalamic tract

8
Q

Describe the sensory pathway of Aa fibres into the sensory nucleus

A

Aa proprioceptive fibres from lower jaw bypass ganglion => mesencephalic nucleus

Fibres sent up to thalamus to mediate conscious proprioception
Also synapse with motor nucleus in reflex action

9
Q

Describe the motor pathway of the trigeminal nerves to the 4 effector muscles

A

Motor fibres from motor nucleus bypass ganglion

Innervate muscles in mastication

  • masseter
  • pterygoid
  • temporalis
  • digastric
10
Q

What foramen is associated with each branch of the trigeminal nerve

A

Ophthalmic => superior orbital fissure (w III, IV, VI)
Maxillary => foramen rotundum
Mandibular => foramen ovale

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