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S&F: Exam 2 > Brainstem > Flashcards

Flashcards in Brainstem Deck (29):
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Spinal Tract and Nucleus of V

Found in the rostral medulla; contain info about pain/temp in the face

*Part of a column continuous w/ dorsal gray matter w/ the spinal cord

=>essentially a continuation of this tract

1

Spinal Trigeminal Tract

Descending pathway of peripheral processes of axons from the trigeminal nucleus; synapse in the spinal nucleus of V

2

Trigeminothalamic Tract

Ascending axon that synapse in the VMP in the thalamus, superior colliculus, PAG, and reticular formation

*Fibers decussate @ various levels in the PONS

-Pain processing, visual reflexes, vertical gaze center, and RAS

3

Restiform body

"Inferior Cerebellar Peduncle"

4

Clarke's Nucleus

Found in the rostral medulla; receives proprioceptive info from the dorsal column and projects axons thru the restiform body

5

Accessory cuneate nucleus

Sends neurons thru the cuneocerebellar tract to relay unconscious proprioceptive info

6

Dorsal nucleus of X

Lies in the dorsal medulla; relays parasympathetic axons to the thoracic region

-Is just lateral to hypoglossal nucleus

7

Nucleus tractus solitarius

Primarily relays gustatory information (rostral medulla)

8

Nucleus ambiguus

LMNs for IX and X; innervation of soft palate, pharynx, larynx, and upper esophagus

-If it could be seen, it would be just dorsal to the ION

9

False localizing sign

Compression of nerve VI from increased ICP; results in medial strabismus

10

Paramedian pontine reticular formation

Horizontal gaze center that coordinates CN III, IV, and VI fnxn

11

Facial colliculus

Bulge on the floor of the 4th ventricle in the pons due to the wrapping of axons of VII

12

SON

Sharpens auditory info and fnxns in acoustic reflex

-Axons decussate to hear thru the trapezoid body

13

Chief sensory nucleus of V

Relays info about fine touch, vibration, and conscious proprioception from the face

-Also called the principal, main, superior, or PONTINE TRIGEMINAL NUCLEUS

14

Motor Nucleus of V

Lies medial to chief sensory nucleus of V; branchiomotor to muscles of mastication

15

Mesencephalic tract and nucleus

Relays unconscious proprioception from muscles of mastication

-Fibers run to motor nucleus of V and motor nucleus of VII (corneal reflex)

-Only pseudounipolar neurons found in CNS

16

Nucleus locus coreulus

Reticular formation important in arousal, attention, sleep cycles

-Found dorsolaterally in the rostral pontine tegmentum

17

Pontine nuclei

In the basal pons; contains corticospinal and corticobulbar axons

18

Superior Colliculus

Found in tectum of rostral midbrain

-Outputs to the cervical spinal cord, gaze centers, and to the pulvinar

19

PAG

Contains:
1. Mesencephalic nucleus of V

2. Descending neurons for transmission of pain; stimulated by opiods which can produce analgesia*

3. Vertical gaze center

20

Red nucleus

Lies at the level of the superior colliculus; output is part of the indirect corticospinal system

*Lesions will produce tremors

21

Decorticate posturing contralaterally

Lesion above the red nucleus; flexed arm/extended leg

22

Decerebrate posturing contralaterally

Unilateral lesion below the red nucleus; extend arm/extend leg

23

Substantia nigra

Contains:

1. Pars compacta- dopamine NTs; first area to go in Parkinson's*

2. Pars reticularis- GABA NTs; efferent area of nucleus

24

Crus cerebri

Contains projection axons and is continuous w/ the internal capsule

-Middle 1/3 contains corticobulbar and corticospinal axons

25

Herpes Zoster

Can involve the ophthalmic division of V resulting in corneal ulcerations and possible blindness

26

Vestibular nuclei

Found in rostral-most medulla

(Found about where dorsal nucleus of X would be)

*PICA=main blood supply

27

Cochlear nuclei

Lies in lateral part of the most-rostral medulla

*AICA= main blood supply

28

Brachium conjunctivum

Superior Cerebellar Peduncle

*Major output center of cerebellum