5.3 Trigeminal Neuroanatomy Flashcards Preview

Gross Anatomy > 5.3 Trigeminal Neuroanatomy > Flashcards

Flashcards in 5.3 Trigeminal Neuroanatomy Deck (24):
1

Where in the CNS is the mesencephalic nucleus?

midbrain

2

Where in the CNS is the chief sensory nucleus?

pons

3

Where in the CNS is the spinal trigeminal nucleus?

medulla

4

What type of sensory modality does the chief sensory nucleus receive?

discriminative tactile and pressure input from the face and oral cavity

5

What type of sensory modality does the spinal trigeminal nucleus receive?

Pain and temperature inputs from the face and oral cavity

6

What type of sensory modality does the mesencephalic nucleus receive?

proprioceptive input from the head (muscles of mastication, teeth and hard palate, TMJ)

7

What cranial nerves have 1st order sensory neurons that synapse in the spinal trigeminal nucleus?

CN V, VII, IX, X

8

Which thalamic nucleus receives sensory info from the sensory trigeminal nuclei?

VPM nucleus of thalamus

9

Axons from the Chief sensory nucleus ascend ipsilaterally as what tract?

dorsal trigeminothalamic tract

10

Axons from the Spinal trigeminal nucleus cross and ascend as what tract?

ventral trigeminothalamic tract

11

Where do the dorsal and ventral trigeminothalamic tracts project to/terminate?

3rd order VPM --> project to face area of post central gyrus

12

Where is the trigeminal motor nucleus?

pons

13

Are the cell bodies in the trigeminal motor nucleus upper or lower neurons?

lower neurons that innervate muscles of mastication

14

What are the 2 sources of input that the trigeminal motor nucleus receives?

bilateral corticobulbar (upper motor neurons) and mesencephalic nucleus

15

What is the afferent limb of the jaw jerk reflex?

sensory portion of V3

16

What is the efferent limb of the jaw jerk reflex?

motor branch of V3

17

If the jaw jerk reflex is present, what motor neurons were damaged in the trigeminal motor system?

corticobulbar pathways (upper motor neurons) --> trigeminal motor nucleus

18

What is the efferent limb of the corneal reflex and where are its cell bodies?

CN VII cell bodies in facial motor nucleus

19

What happens with the corneal reflex if there is a CN V1 lesion?

no direct or consensual reflex = can't blink on either side

20

What happens with the corneal reflex if there is a left CN VII lesion?

No direct = can't blink left eye
intact consensual = right eye will blink

21

What is the efferent limb of the lacrimal reflex and where are its cell bodies?

CN VII transmits impulses via superior salivatory nucleus

22

What is the oculocardiac reflex?

bradycardia induced by compression of the eye ball

23

What is the afferent pathway of the oculocardiac reflex?

CN V1

24

What is the efferent pathway of the oculocardiac reflex?

dorsal motor nucleus of CN X (preganglionic parasympathetic fibers to cardiopulmonary plexus)