S6: Internal and External Anatomy of the Pons Flashcards Preview

Neuroanatomy Lab > S6: Internal and External Anatomy of the Pons > Flashcards

Flashcards in S6: Internal and External Anatomy of the Pons Deck (50)
1

Middle Cerebellar Peduncles

2

CN 5

3

CN 6

4

CN 7

5

 Superior Cerebellar Peduncles

6

basis of the pons

7

16 

facial colliculus

8

vestibular area

9

pontine tegmentum

10

Abduscens nuclei

supplied by: perforating branches of basilar

11

Facial Nerve

 

supplied by anterior inferior cerebral a.

12

medial lemniscus

supplied by mostly branches from the basilar

13

lateral lemniscus

14

Superior olive

supplied by AICA ?

15

Vestibular nulcei

supplied by AICA

16

Medial longitudinal fascilus

supplied by perforating basilar a. 

17

Paramedian Pontine Reticular formation

18

Rubrospinal tract 

19

ALS

 

supplied by AICA

20

Spinal n. of trigem. 

 

supplied by AICA

21

Spinal tract of trigem. 

supplied by aica

22

inferior cerebellar peduncle

23

superior cerebellar peduncle

24

corticospinal tract

supplied by perforating branches of basilar 

25

middle cerebellar peduncle 

26

medial lemniscus

27

rubrospinal tract

28

ALS

29

Motor nucleus of trigem

supplied by AICA

 

function: somatosensory for head and neck and motor jaw muscles

pathology: numbness in head and neck on SAME SIDE

weakened chewing

sensory loss elsiminating corneal reflexing -> irritated cornea

30

principal sensory of trigem.

function: epicritic from head and neck

pathology: reduced 2 point tactile, fibration, position sense on SAME SIDE of head

31

CN 5: Trigem

function: somatosensory for head and neck, motor for jaw

pathology: numbness in head and neck on the same side, weakened chewing, sensory loss eliminates corneal reflex resulting in irritated cornea

32

lateral lemniscus

function: hearing

pathology: no obvious pathology (from unilateral X)

33

Superior olive

function: hearing, particularly in locating the source of sound

pathology:

unilateral - nothing, due to bilaterality of auditory pathway

34

Decussation of the trapezoid body

function: 1. somatosensory for trunk and limbs (medial lemniscus)

2. autditory: crossing lateral lemniscus fibers

 

pathology:

1. loss of epicritic sense for trunk and limbs

2. no obvious hearing loss

35

Locus Ceruleus

function: main source of Norepeinphrine, motor control and sleep; adjusts muscle tone during rem

Pathology: prevents collapse of tone during  REM (in cats...), implicated in parinksonism

36

Medial longitduinal fasiculus

function: coordinates head and eye position

pathology: itnernuclear opthalmoplegia; contralateral eye cannot adduct for conjugate gaze shift but can adduct during convergence

37

pontine nuclei

38

Medial longitudinal fasciculus

function: coordinates head and eye position

pathology: contralateral eye cannot adduct for conjugate gaze shift, can adduct during convergence

39

locus ceruleus

function: main source of norepeinhrpine; motor control and sleep; adjusts muscle tone during REM

pathology: implicated in parinksoniasm, prevents collapse of tone during REM sleep

40

superior cerebellar peduncle

pathology: cerebellar signs: ataxia, intention tremor

connections:o carries most of cerebellums output to other parts of the brain

• main ouput:
 areas of pontine reticular formation
 red nucleus in the midbrain
 ventral anterior and ventral alteral nucleus in the thalamus -> precentral gyrus and premotor cortex

41

medial lemniscus

function: epicritic somatosensory for trunks and limbs on OPPOSITE SIDE

pathology: loss of 2 point, vibration, position sense, asterogonosis, shuffling gait etc. 

42

crus cerebri

function:

cortical control of movement and some descending gating of sensory signals

pathology: 1. loss of indepdent finger movement

2. slowed rxn times

3. slight weakness

 

43

lateral lemniscus

function: hearing

pathology: no obvious sx from unilateral X

44

Corticospinal tract

function: motor contorl from cortex to motor neurons of CN and ventral horn

isolated pathology: loss of indepdent finger control, slowed rxn times 

45

facial nculeus

46

superior cerebellar peduncle

47

dentate nucleus

48

inferior cerebellar peduncle

49

middle cerebellar peduncle

50