Internal Anatomy of Midbrain Flashcards Preview

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Flashcards in Internal Anatomy of Midbrain Deck (40)
1

tectum

2

superior colliclus

3

brachium of inferior collilculus

4

crus cerebri

5

tegmentum of midbrain

6

cerebral aqueduct

7

Cerebral Peduncle (crus cerebri + grey matter of the tegementum)

8

prectal area

above the  brachium

9

inferior colliculus

function: hearing, localization of sound

pathology: subtble deficits in localizing source of sound

10

Lateral lemniscus

function: hearing

pathology: no obvious sx from unilateral X

11

ALS /Spiunothalmic

function: carries propathic (simple touch, pressure, pain and temp from the OPPOSITE side of the body)

pathology: contralateral loss of propathic sensation beginning 2 segments below the lesion. 

12

medial lemniscus

function: epicritic somatosensory for trunk and limbs on the OPPOSITE SIDE

pathology: loss of 2 point, vibration, position sense, asterognosis, shuffling gait

13

axons going through here

axons of the decussation of the superior cerebellar peduncle 

14

Decussation of the superior cerebellar peduncle

function: carries signals of disparate function between cerebellum and brain stem

pathology: cerebellar signs: ataxia, intention tremor

15

corticospinal tract

function: motor control from cortex to motor neurons 

16

medial longitudinal fascilus

function: coordinates head and eye position

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

 

17

Nucleus of CN 4

function: rortates the eye and assists in abduction and downward movement

pathology: subtle effects in OPPOSITE EYE

slightl difficulty converging and looking downwards

18

Periaqueductal Gray

function: pain sensation, rich in endorphin receptors

pathology: in animals, blocks the benefit of analgesics

19

cerebral aqueduct

20

superior colliculus

functions: 1. sensory: vision, perhaps to focus visual attension on a sector of space

2. motor: controls roientaing movements of head and neck

pathology: subtle deficits..

1. partial neglect of contralateral visual space

2. slightly smaller saccades OPPOSITE the lesion

21

bracium of the inferior colliculus

function: conveys auditory signals to the midbrain to the thalamus

pathology: UNK (bilateral X is rare)

connections: inferior colliculus to the MGN

 

midbrain section, hole without the frog eyes

22

ALS/Spinothalamic tract

function: carries protopathic info

pathology: contralateral loss of protopathic sensation beginning two segments below the lesion

23

medial lemniscus

pathology: loss of 2 point, vibration, position sense, asterogenosis, shuffling gait

24

Decussation of superior cerebellar peduncle

pathology: cerebellar signs: ataxia, intentional tremor

25

crus cerebri

function: cortical control of movement and some descending gating of sensory signals

pathology: loss of independent finger movement, slower rxn times, sight weakness

26

Corticospinal tract

27

medial longitudinal fasiculus

28

Trochlear nucleus

funtion: rorates eye and assists in abduction and downward movement

pathology: subtle effects on OPPOSITE eye

slight difficulty converging and looking downward

29

superior colliculus

function: 1. sensory: vision, perhaps to focus visual attn on a sector of space

2. motor: controls orienting movements of the head and neck

pathology: subtle deficits: 

1. partial neglect of OPPOSITE visual space

2. slightly smaller saccades directed to side opposite of lesion

30

medial lemniscus

function: epicritic somatosensory for trunk and limbs on opposite side

 

31

anterolateral system/spinothalamic tract

function: carries propathic information (simple touch, pressure, pain, and temperature)

32

substantia nigra

function: pars compacta: skeletal movement, complete dopamine synthesis

paras reticula: skeletal and eye movements

33

Crus cerebri

function: cortical control of movement and some descending gating of sesnory signals

pathology: loss of indepdentent finger movement, slowed rxn times, slight weakness

34

cerebellothalamic fibers

35

Red nucleus

fnction: skeletal movement

pathology: probably no obvious sx from isolated pathology

36

Medial geniculate nucleus (body)

function: hearing

pathology: lose ability to decode patterns of sound

errors in localizing source of sound

37

CN III

function: rorates eye upward, downward, toward nose

constricts the pupil

accomidation of the lens for near vision

pathology: external strabisimus: eye deviated OUTWARD and cannot move nasally, up, or down

pupil is dilated and cannot constrict (due to pathology of near endinger westphal)

38

CN III

function: rorates eye upward, downward, toward nose

constricts the pupil

accomidation of the lens for near vision

pathology: external strabisimus: eye deviated OUTWARD and cannot move nasally, up, or down

pupil is dilated and cannot constrict (due to pathology of near endinger westphal)

39

Nucleus Raphe Dorsalis

40

brachium of the superior collculus

no isolated pathology described.