cranial nerve functions

Question 1

oculomotor nerve nuceli

Answer 1

1) located in the midbrain at level of superior colluculis
2) GSE neurons in the oculomotor nucleus
- muscles of the orbit
3) GVE in the nuclei of edinger westphal
- pupil dilation and constriction
4) post ganglionic parasympathetic neurons are located in ciliary ganglion

Question 2

trochlear nerve nuclei

Answer 2

1) only nerve from posterior aspect of the brainstem
- midbrain at the level of inferior colliculus
2) GSE are in the trochlear nucleus
3) fibers from the left nucleus cross fibers from the right one to provide innervation
- to the contralateral superior oblique

Question 3

trigeminal nerve nucleu

Answer 3

1) nuclei extend from the midbrain to the spinal cord
2) mesencephalic nucleus lies in the midbrain
- receives proprioception from mastication muscles and PDL - jaw jerk reflex
3) main sensory nucleus in the pons
- receive touch receptors
4) spinal trigeminal nucleus runs from upper spinal cord to the medulla and receives pain and temperature fibers
5) all somatic efferent fibers
- originate in the motor nucleus of CN V

Question 4

abducens nuclei

Answer 4

1) GSE originate from the abducens nucleus in the pons

Question 5

facial nerve nuclei

Answer 5

1) GSE to muscles of facial expression
- originate from facial motor nucleus
2) GVE to the lacrimal, sublingual and submandibular glands
- originate in superior salivatory nucleus
- preganglionic parasympathetic
3) special sensory taste from anterior 2/3 of the tongue
- terminate in solitary nucleus

Question 6

vestibulocochlear nucleu

Answer 6

1) nuclei lie in the medulla and pons
2) SSA from cochlear
- terminate in two cochlear nuclei ventral and dorsal
3) special sensory vestibular fibers terminate 4 vestibular nuclei
- medial, lateral, superior, inferior

Question 7

glossopharyngeal nerve nuclei

Answer 7

1) special sensory taste from posterior 1/3 of tongue
- terminate in solitary nucleus
2) GSA for pain and temperature in the pharynx and posterior 1/3 of tongue
- terminate in spinal trigeminal nucleus
3) GVE that supply parotid gland
- lie in inferior salivatory ganglion
- parasympathetic preganglionic
4) GSE to stylopharyngeus originate in nucleus ambiguus

Question 8

vagus nerve

Answer 8

1) SSA from epiglottis region terminate in solitary nucleus
2) GSE to muscles innervated by X and XI
- originate in nucleus ambiguus
3) GVE that supply thoracic and abdominal viscera
- lies in dorsal motor nucleus of CN X

Question 9

spinal accessory nerve

Answer 9

1) GSE to trapezius and SCM
- originate in anterior horns of cervical spinal segments C1-C5
2) GSE to muscles innervated by CN XI via CN X
- originate in the nucleus ambiguus and merges up with spinal root, then jumps over to vagus nerve

these do not mix

Question 10

hypoglossal nerve nuclei

Answer 10

1) GSE to the muscles of the tongue
- originate in the hypoglossal nucleus of the medulla