Cranial Nerve Components Flashcards Preview

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Flashcards in Cranial Nerve Components Deck (9)
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1

CN III (Occulomotor)

Contributing Nuclei (2)

Nuclei Type/Functions

  • Occulomotor Nucleus
    • Somatomotor
    • Muscles of eye + eyelid opening
  • Edinger-Westphal Nucleus
    • Preganglionic Parasympathetic
    • Pupil diameter and lens shape

2

CN IV (Trochlear)

Contributing Nuclei (1)

Nuclei Type/Functions

  • Trochlear Nucleus
    • Somatomotor LMNs
    • One muscle of eye - Superior Oblique
  • NOTE: Only nucleus/CN to cross AND exit dorsally

3

CN V (Trigeminal)

Contributing Nuclei (4)

Nuclei Type/Functions

  • Trigeminal Motor Nucleus
    • Branchial Motor LMNs
    • Muscles of mastication
    • Tensor Timpani in middle ear
  • Mesencephalic Nucleus V
    • Somatosensory
    • Unconscious proprio of Jaw
  • Chief Sensory Trigeminal Nucleus
    • Somatosensory
    • Light touch/pressure of face
    • Light touch/pressure of ant. 2/3 of tongue
  • Spinal Nucleus V
    • Somatosensory
    • Pain/temp of face
    • Pain/tmep of ant. 2/3 of tongue

4

CN VI (Abducens)

Contributing Nuclei (1)

Nuclei Type/Functions

  • Abducens Nucleus
    • Somatomotor
    • Lateral Rectus eye muscle
    • Runs interneurons to Medial Rectus of opposite eye

5

CN VII (Facial)

Nerve Roots (2)

Contributing Nuclei (4)

Nuclei Type/Functions

  • Nerve roots
    • Motor (medial - facial nucleus)
    • Intermediate (lateral - all else)
  • Facial Nucleus (motor nerve root)
    • Branchial Motor LMNs
    • Muscles of facial expression
    • Strapedius (middle ear)
  • Spinal Nucleus V
    • Somatosensory
    • Pain from ear
  • Solitary Nucleus
    • Viscerosensory
    • Taste of ant. 2/3 of tongue
  • Superior Salivatory Nucleus
    • Visceromotor Preganglionic Parasympathetic
    • Submandibular and sublingual salivary glands
    • Lacrimal glands

6

CN IX (Glossopharyngeal)

Contributing Nuclei (4)

Type/Function

  • Nucleus Ambiguous
    • Branciomotor (LMNs)
    • One muscle that elevates pharynx during swallowing (stylopharyngeus)
  • Inferior Salivatory Nucleus
    • Visceromotor (preganglionic parasympathetic)
    • Parotid Gland
  • Solitary Nucleus
    • Viscerosensory
    • Taste from post. 1/3 of tongue
  • Spinal Nucleus of V
    • Somatosensory
    • Pain and temp of ear, post. 1/3 of tongue and pharynx

7

CN X (Vagus)

Contributing Nuclei (4)

Type/Function

  • Nucleus Ambiguous
    • Branchiomotor (LMNs)
    • Palatal, Pharyngeal and Laryngeal muscles (swallowing)
  • Dorsal Motor Nucleus of Vagus
    • Visceromotor
    • Viscera of thorax and abdomen
  • Solitary Nucleus
    • Visceroosensory
    • Taste from Epiglottis
    • Signals from Aortic body stretch and chemoreceptors
  • Spinal Nucleus of V
    • Somatosensory
    • Pain and temp. from Larynx and esophagus

8

CN XI (Accesory)

Contributing Nuclei (1)

Type/Function

  • Accesory Nucleus
    • Branchiomotor (LMNs)
    • Sternocleidomastoid and trapezius muscles
  • Runs down into spinal cord
    • Ventral horn-ish
    • C1-C5/6

9

CN XII (Hypoglossal)

Contributing Nuclei (1)

Type/Function?

  • Hypoglossal Nucleus
    • Somatomotor (LMNs)
    • Muscles of Tongue