Cranial Nerve Nuclei Flashcards

Explore the locations, functional columns, sensory and motor nuclei, and cranial nerve connections within the brainstem.

Card 1 of 30Question

What are cranial nerve nuclei?

Collections of neuronal cell bodies in the central nervous system associated with cranial nerve functions.

In This Section

1. What are cranial nerve nuclei?

Collections of neuronal cell bodies in the central nervous system associated with cranial nerve functions.

2. Where are most cranial nerve nuclei located?

In the brainstem, distributed through the midbrain, pons, and medulla oblongata.

3. Which embryological groove separates motor and sensory nuclear columns?

The sulcus limitans.

4. How are motor and sensory cranial nerve nuclei arranged relative to the sulcus limitans?

Motor nuclei lie medially, while sensory nuclei lie laterally.

5. Which functional nuclear column supplies somatic skeletal muscles?

The general somatic efferent column.

6. Which functional nuclear column supplies muscles derived from pharyngeal arches?

The special visceral efferent, or branchial motor, column.

7. Which functional nuclear column contains preganglionic parasympathetic neurons?

The general visceral efferent column.

8. Which midbrain nucleus supplies most extraocular muscles through cranial nerve III?

The oculomotor nucleus.

9. Which nucleus provides preganglionic parasympathetic fibers to the ciliary ganglion?

The Edinger-Westphal nucleus, associated with the oculomotor nerve.

10. At what level of the midbrain is the trochlear nucleus located?

At the level of the inferior colliculus.

11. What is distinctive about trochlear motor fibers before they exit the brainstem?

They decussate in the superior medullary velum before emerging dorsally.

12. Which trigeminal nucleus processes fine touch and pressure from the face?

The principal sensory nucleus of the trigeminal nerve in the pons.

13. Which trigeminal nucleus processes facial pain and temperature?

The spinal trigeminal nucleus.

14. Which trigeminal nucleus contains primary sensory neuron cell bodies for jaw proprioception?

The mesencephalic nucleus of the trigeminal nerve.

15. Which nucleus supplies the muscles of mastication?

The motor nucleus of the trigeminal nerve in the pons.

16. Which pontine nucleus supplies the lateral rectus muscle?

The abducens nucleus, located beneath the facial colliculus.

17. Which cranial nerve fibers loop around the abducens nucleus?

Motor fibers of the facial nerve, forming the internal genu of the facial nerve.

18. Which nucleus contains motor neurons supplying the muscles of facial expression?

The facial motor nucleus in the caudal pons.

19. Which nucleus provides parasympathetic fibers for lacrimal gland secretion?

The superior salivatory nucleus, through the facial nerve pathway.

20. Which nucleus receives taste information from cranial nerves VII, IX, and X?

The rostral gustatory portion of the nucleus of the solitary tract.

21. Which nuclei receive auditory information from the cochlear nerve?

The dorsal and ventral cochlear nuclei at the pontomedullary junction.

22. Which nuclei receive vestibular information concerning balance and head movement?

The superior, medial, lateral, and inferior vestibular nuclei.

23. Which medullary nucleus supplies branchial motor fibers to the pharynx and larynx?

The nucleus ambiguus, primarily through the vagus nerve.

24. Which nucleus provides preganglionic parasympathetic fibers to thoracic and abdominal viscera?

The dorsal motor nucleus of the vagus nerve.

25. Which nucleus receives visceral sensory information from the carotid sinus and aortic arch?

The caudal visceral sensory portion of the nucleus of the solitary tract.

26. Which nucleus supplies parasympathetic fibers to the otic ganglion?

The inferior salivatory nucleus, through the glossopharyngeal nerve.

27. Where is the hypoglossal nucleus located?

In the medial medulla, beneath the hypoglossal trigone of the fourth ventricle.

28. Which cranial nerve nucleus supplies intrinsic and most extrinsic tongue muscles?

The hypoglossal nucleus, through cranial nerve XII.

29. What clinical deficit results from a unilateral lower motor neuron lesion of the hypoglossal nucleus?

The protruded tongue deviates toward the side of the lesion.

30. Which nucleus is involved in the pupillary light reflex as the parasympathetic motor output?

The Edinger-Westphal nucleus, activated through connections from the pretectal area.