Brainstem introduction Flashcards Preview

MD4001 Anatomy > Brainstem introduction > Flashcards

Flashcards in Brainstem introduction Deck (29)
1

what are the functions of the brainstem

motor coordination
reticular formation
cranial nerves
vital and non vital centres

2

describe the distribition of cranial nerves in the brainstem

4 from midbrain and above

4 from the pons

4 from the medulla

3

does a brainstem lesion cause ipsilateral or contralateral defects

ipsilateral usually

4

ambiguous nucleus

somatic motor

5

solitarius

visceral sensory

6

what structures are found superior to the brainstem

tentorium cerebelli and diencephalon

7

what is the superior cerebellar peduncle

connects the cerebellum and midbrain

8

what is the middle cerebellar peduncle

connects the pons and cerebellum

9

what connects the medulla and cerebellum

inferior cerebellar peduncle

10

where does conscious proprioception cross (ascends in the dorsal columns)

brainstem then ascends in the medial lemniscus

11

where does light touch cross

some crosses straight away
some crosses in the brainstem

12

what does unconscious proprioception ascend in

spinocerebellar tract

does not cross

13

what information is found in the corticospinal tract

descending motor
crosses in the brainstem

upper motor neurone synapses with a lower motor neuron in the spinal cord

14

in what lesion are fasciculations present

lower mn

15

tone and reflexes

increased in upper mn lesion

16

atrophy

only present in lower mn lesions

17

what is the sympathetic supply from the hypothalamus

facial sweating, eyelid elevation, vasomotor and pupil dilation

doesn't usually cross

18

what is the general visceral autonomic output from the brainstem

eye, saliva, heart, lungs, gut

(cn 3,7,9,10)

19

what is the autonomic function of the facial nerve

chorda tympani to submandibular and sublingual glands

20

what are the components of special somatic afferent

hearing
balance
sight

cn 2 -sight
cn8- balance and hearing

21

corticobulbar tract

The muscles of the face, head and neck
UMN

22

corticospinal tract

Upper motor neurons for the body

may cross in the medulla or spinal cord

23

why will a brainstem lesion cause contralateral upper motor neurone signs

fibers cross in the brainstem below (start in the cortex)

24

what is the medial lemniscus a continuation of

the dorsal column

25

what is the function of the medial lemniscus

discriminatory touch and proprioception to the thalamus then cross over and ascends as medial lemniscus to sensory cortex

26

what is the spinal lemniscus

continuation of the spinothalamic tract

carries pain, temp, course touch to the thalamus and then to the post central gyrus

27

what is the function of the cuneocerebellar tract

continuation of the spinocerebellar tract

28

what is the function of the medial longitudinal fasciculus

carries information about the direction that the eyes should move

29

what is the diencephalon

posterior part of the forebrain, containing the epithalamus, thalamus, hypothalamus, and ventral thalamus and the third ventricle.