Brainstem Flashcards Preview

Neuro 3 (mine) > Brainstem > Flashcards

Flashcards in Brainstem Deck (20)
Loading flashcards...
1
Q

Cerebral peduncle

A

cerebrum to spinal cord, pons, CN nuclei

2
Q

Superior cerebellar peduncle (SCP)

A

cerebellum TO (and from):
anterior spinocerebellar tract
red nucleus
thalamus (VA/VL)

3
Q

Middle cerebellar peduncle (MCP)

A

FROM pons (cerebral cortex) to cerebellum

cerebral cortex–>pons–MCP–>cerebellum

4
Q

Inferior cerebellar peduncle (ICP)

A

cerebellumposterior spinocerebellar tract, inferior olive, vestibular nucleus

5
Q

Corticospinal tract

A

Motor

Decussates at base of medulla

6
Q

Dorsal Column/Medial Lemniscus

A
  • Fine touch, vibration, proprioception

- Decussates mid-medulla

7
Q

Anterolateral System (spinothalamic)

A
  • pain, temp

- Decussates at level of spinal cord

8
Q

Most long tract lesions in brainstem will be ____; most cranial nerve signs will be _____ to lesion

A

long tract: contralateral

cranial n: ipsilateral

9
Q

Cranial nerves for midbrain, pons, medulla

A

Midbrain: 3,4

pons: 5,6,7,8
medulla: 9,10,11,12

10
Q

Cranial nerves

A
CN I – Olfactory
CN II – Optic
CN III – Oculomotor
CN IV – Trochlear
CN V (1,2,3) – Trigeminal
CN VI – Abducens
CN VII – Facial
CN VIII – Vestibulocochlear
CN IX – Glossopharyngeal
CN X – Vagus
CN XI – Accessory
CN XII – Hypoglossal
11
Q

CN nuclei:

midbrain

A

III
Edinger Westphal Nucleus
IV

12
Q

CN nuclei:

pons

A
V
Mesencephalic nuc of V
Primary motor nuc of V
Main sensory nuc of V
Spinal nucleus of V (@caudal pons)
VI
VII
VIII (cochlear nucleus and vestibular nucleus at pontomedullary junction)
13
Q

CN nuclei:

medulla

A

IX (nucleus of solitary tract)
X (nucleus of solitary tract, dorsal motor nucleus of vagus and ventral motor nucleus of vagus aka nucleus ambiguous)
XII (hypoglossal nucleus)
(Spinal nucleus of V is here too)

14
Q

Pupillary light reflex

A

shining light in one eye will cause pupillary constriction in both eyes
Afferent=II (sensory fibers from retina)
Efferent=III (parasympathetic fibers to ciliary ganglion)

15
Q

MLF

A

coordinating eye movements with head movements

  • MLF
  • CN nuclei 3,4,6,8
  • Also involves cerebellum, medial vestibulospinal tract (to coordinate neck muscles too)
16
Q

Dorsal motor nuc of X

A

Preganglionic parasymp vagal neurons to heart and thoracic & abdominal viscera

17
Q

Nucleus Ambiguous

A

motor vagal neurons to muscles of pharynx, larynx (swallowing, phonation, movement of uvula, gagging)… this nucleus also contains motor fibers to stylopharyngeus muscle which helps in phonation and swallowing (but not gagging)

18
Q

Solitary nucleus

A

special sensory (taste) from 7, 9, 10

19
Q

Gag reflex

A

touching the wall of one side of pharynx elicits bilateral gagging response
Afferent=IX (sensory fibers)
Efferent=X (nucleus ambiguous)

20
Q

Jaw Jerk reflex

A

Downward tapping of jaw causes biilateral contraction of masseter
Afferent = mesencephalic nucleus of V (stretch receptors in masseter)
Efferent = main motor nucleus of V