S5: Internal and External Anatomy of the Medulla Flashcards Preview

Neuroanatomy Lab > S5: Internal and External Anatomy of the Medulla > Flashcards

Flashcards in S5: Internal and External Anatomy of the Medulla Deck (65)
1

Fasciculus cuneatus

 

function: carries ipsilateral epicritic sesnory from the UPPER HALF of the body

pathology: loss of epicritic below lesion on the SAME SIDE

2

fasciulus gracilis

carries ipislateral epicritic sensory from LOWER HALF of the body

pathology: loss of epicritic sensation below the lesion ON THE SAME SIDE

3

Nucleus gracilis

function: epicritc sensory, 2 point position, vibration, tactile for movement requiring fast sensory feedback

pathology: "dorsal column signs" loss of epicritic sensory for trunk and limb

inaccurate movements

4

Nucleas Cuneatus

function: epicritic somatosensory for upper trunk and limb on the SAME SIDE

pathology: in medulla: loss of 2 point vibration, position, tactile form sense, inaccurate movements

5

spinal nucleus of 5

function: somatosenoy for head and neck

pathology: loss of pain and temeprature senses on the same side of the head

6

7

Rubrospinal tract

function: distal motor control

pathology: ipsilateral loss of distal motor control below the X

8

Extrapyramidal tracts: vesitbulospinal reticulospinal, and tectospinal

function: proximal motor contorl

pathology: loss of proximal motor control below the lesion if damaged bilaterally along with the anterior corticospinal tract

9

Decussation of the pyramids

10

dorsal spinocerebellar tract

function: carries proproreceptive info. dstined for the cerebellum from the LOWER HALF OF THE BODY

pathology: controls ipsilateral muscle coordination but not obvious sx result from pathology

11

hypothalamoreticulospinal tract

function: carries rpegang symps to the intermediolateral cell column

pathology: ipsilateral horners syndrome

12

dorsal nucleus of vagus nerve

function: parasymps for heart, lungs, GI

pathology: inc in HR, subtle effects

13

Hypoglossal

pathology: tongue points to side of the lesion 

14

medullary pyramids

corticospinal axons (before they crossed in decussations!) 

 

15

yellow

decussation of pyramids

 

corticospinal tract crossing over here

16

what cranial nerves are around here?

 

what nuclei does it have?

olive

 

CN - hypoglossal exits between olive and the pyramids

the vestibulocochlear its between depression of the pons and the olive

 

nuclei - inferior olive n. which receives information from most areas of cerebral cortex, the red nucleus, and from the spinal cord and sends it to the cerebellum via the inferior peduncle

17

what does the inferior olive do? where is it?

inferior olive is in the olive complex in the medulla

sends axons from the cortex, red nucleus, and spinal cord to cross the midline and go to the inferior cerebellar peduncle

18

4'

input?

what does damage to this cause?

inferior cerebellar peduncle

receives input from opposite infeiror olive nulcei in medulla

often seen with PCA stroke. damage causes

1. ataxia

2. intention tremor to the ipsilateral side of the body

3.lean towards side of the lesion

4. clumsiness of ipsilateral hand

19

10

cuneate tubercle

carry somatosensory and proprioceptive information

20

gracile tubercle

have gracile nucleus

carry somatosensory and proprioceptive information

21

cuneate nucleus

22

reticular formation

23

nucleus ambiugous

 

Function:
Motor innervation of IPSI. muscles of the soft palate, pharynx, larynx and upper esophagus.

 

Deficits:
Lesion of nucleus ambiguus results in atrophy (lower motor neuron) and paralysis of innervated muscles, producing nasal speech, dysphagia, dysphonia, and deviation of the uvula toward the CONTRA

24

gracile nucleus

25

cuneate fasiculus

26

dorsal motor nucleus of X

27

hypoglossal n. 

28

medial longitudinal fasciulus

29

medial lemniscus

input - gracile or cuneate input on the other side

30

medullary pyramid

31

raphe nuclei

32

inferior olive complex

33

solitary nucleus

pathology -- loss of taste on side of the lesion

34

spinal trigem nucelus

35

tract of spinal trigem

36

inferior cerebellar peduncle

37

ALS

38

axons going through here..

olivio-cerebellar axons

39

HRST

40

Pyramids

41

medial lemniscus

42

inferior olive

43

MLF

 

44

cuneate nucleus

45

solitary nucleus

46

dorsal nculeus of vagus

47

inferior cerebellar peduncle

48

ALS

49

spinal trigem tract

50

HRST

51

hypoglossal nuclei

52

reticular formation

53

inferior olive

54

medial lemniscus

55

medulla pyramids

56

ALS

57

HRST

58

rubrospinal tract

59

spinal nucleus of 5

60

spinal tract of 5

61

vestibular nucleus

62

MLF

63

dorsal cochlear nucleus

64

ventral cohclear nucleus

65

raphe nculeus