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Flashcards in 3 PONS Deck (42):
1

What are the two major regions of the pons?

tegmentum and basis pontis

2

what does basis pons contain

-corticopontine and pontocerebellar fibers
- PONTINE NUCLEI

3

pons is derives from which latin word?

bridge

4

What does the pontine tegmentum contain?

CN nuclei and major ascending/descending tracts

5

which CN nuclei does the tegmentum contain? motor and sensory

motor=VII, VI, and V
sensory= VIII V

6

What is the major internuclear tract found in the pontine tegmentum?

medial longitudinal fasciculus (MLF)

7

What are the major ascending tracts of the pontine tegmentum?

medial lemniscus
trigemino-thalamic
spinothalamic

8

The facial nucleus contains what type of branchiomotor neurons?

SVE- migrates away from floor of 4th ventricle

9

T-F-- axons of the facial nucleus wrap around the lateral edge of the abducens nucleus

false- medial edge

10

Do lesions of the abducens nucleus often damage CNVII fibers?

YES

11

The rostral end of the spinal nucleus and tract of V is in the caudal pons, afferent endings here are mostly what types of sensations?

crude touch from face and cornea

12

ParaSNA nuclei (GVE) in the pons include what?

superior salivatory nucleus and inferior salivatory nucleus

13

As the basis pontis swells what happens to medial lemniscus?

flattens out and inferior portion lies laterally

14

T-F---the caudal part of the solitary nucleus receiving taste is in the caudal pons?

false, rostral part in the caudal pons

15

What does spinal trigeminal tract carry at the pontine level?

primary afferents simple touch from face

16

2nd order fibers of the spinal trigeminal cross midline and ascend as what?

ventral trigeminothalamic tract

17

What receives discriminative touch sensation from the head and face?

main sensory nucleus of V

18

What 2nd order neuron carries conscious proprioception, vibratory sensation, and discriminative touch from the contralateral body?

medial lemniscus

19

T-f---2nd order tract fibers carrying pain, temp and simple touch from contralateral body pass through the basis pontines?

false- pass through pontine tegmentum

20

What in the pons connects the III, IV and VI nuclei with themselves and with the vestibular nuclei?

medial longitudinal fasciculus

21

What connects the abducens and oculomotor nuclei to enable lateral conjugate gaze?

MLF

22

What is the gray matter component in the basis pontis?

pontine nuclei

23

What is the largest input into the cerebellum?

middle cerebellar peduncle- (axons of neurons in the pontine nuclei cross middling to enter this)

24

Where do corticonuclear fibers to V, VI and VII nuclei enter the tegmentum?

upper pons

25

What do the pontine nuclei receive signals from?

every area of the ipsilateral cortex via cortico-pontine fibers

26

Do pontocerebellar fibers enter the opposite cerebellum?

yes

27

What reflex is mainly used to test the integrity of the pons?

corneal reflex

28

Nociception from the cornea is carried by what type of fibers?

Asigma and C fibers from long ciliary branches of V1

29

Is the corneal reflex consensual?

yes

30

What 3 major groups of vessels supply the pontine region from the basilary artery?

-paramedian (medial part of basis and tegmentum)
-short circumferential (ventrolateral basis pontis only)
-long circumferential-[AICA- superior cerebellar arteries] (lateral and dorsal pontine tegmentum)

31

Lesion of the abducens nerve produces what?

ipsilateral lateral rectus palsy

32

Lesions of the abducens nucleus produces what?

paralysis of lateral conjugate gaze on side ipsilateral to the lesion

33

Lesions of the MLF produce what?

look opposite of lesion- ipsilateral adducting eye cannot adduct while contralateral eye can abduct

34

Lesions involving facial nerve or nucleus produce?

LMN signs
ipsilateral to side of lesion
affect upper and lower face

35

T-F---the lower face receives UMN bilaterally?

False- contralateral (upper face receives bilayer)

36

Unilateral UMN VII lesions produce what?

contralateral lower face paralysis

37

Tegmental pontine syndromes are characterized by?

ipsilateral CN signs and contralateral sensory loss over body

38

What syndrome- bilateral corticobulbar fibers to CN motor nuclei, UMN weakness, speeach problems, dysphagia, inappropriate outbursts of laughter/crying, emotional input is preserved?

pseudo bulbar palsy

39

What syndrome--caudal basal pontine lesion of VI and VII. Crossed hemiplegia with ipsilateral LMN signs in head and contralateral signs in body?

millard-grubler

40

What syndrome- contralateral UMN to the body and ipsilateral CN signs?

basal pontine syndromes

41

What syndrome--rostral pontine tegmental lesion with VI nerve palsy and conjugate gaze palsy, dysarthria and contralateral hemianesthesia?

raymond-cestan

42

what syndrome-- facial expression, speech and movement affected. somatosensory is sparred so patient is awake and aware. eye movements may also be spared?

Locked-in syndrome- large lesions of the basal pons damaging the corticospinal and corticobulbar pathways.