Lecture 5- Motor Ad Sensory Pathways Flashcards Preview

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Flashcards in Lecture 5- Motor Ad Sensory Pathways Deck (36):
0

Area ......: Broca’s area:
contains movement patterns for
making ........ ......... ......... .........?

44
Speech sounds and writing

1

Most ascending sensory pathways (except olfactory) are relayed via the ......... and project to ......... .......?

Thalamus
cerebral cortex

2

Major descending motor tracts from ....... ....... generally bypass ......... on the way down to thespinal cord.

cerebral cortex
thalamus

3

Stimulation of motor cortex produces muscle contraction on
................. side of body.

contralateral

4

Basal ganglia concerned with controlled purposeful
movements. They integrate info from ......... ........, process it and project it back to ....... through the ...........

cerebral cortex
cortex
thalamus

5

Functional disturbances of basal ganglia will cause ......... .........?

movement disorders.e.g Parkinson's

6

Motor pathways:
Corticospinal tract is the main pathway controlling ....... ........?

Voluntary pathways

7

Motor pathways:
Axons originate from ........ ....... ........ cell bodies in the cerebral motor cortex (in posterior frontal lobe) and pass to the medulla where they form the ........... .........

upper motor neuron
medullary pyramids.

8

Motor pathways:
Most fibres decussate at pyramids to form the ......... ......... .......?

lateral corticospinal tract.

9

Fibres that don’t decussate form the ......... ........ .......?

anterior (ventral) corticospinal tract.

10

Motor pathway:
Synapse with ...... ...... ....... in the ......... ......... horn of spinal cord grey matter.

lower motor neurons
anterior (ventral)

11

Lateral corticospinal => mediates ........ control of movement of ...... and motor functions of CN IX, CN X and CN XII (9,10,11)
(decussates at pyramids).

voluntary
limbs

12

Ventral corticospinal =>.......... tract that eventually crosses the spinal cord to synapse with ....... horn and control of ....... muscles.

uncrossed
anterior
axial

13

Rubrospinal => from ........ ........ to spinal cord. Role in control of ........ .......?

red nucleus
flexor tone

14

Vestibulospinal => from ...... ....... to spinal cord. Role in control of ......... ........ and maintenance of ......... And .........

vestibular nuclei
extensor tone
posture and balance

15

Somatosensory
“Body sense”
• Pain
• Temperature
• Simple touch
• Proprioception (perception of .......)
• Kinesthesia (perception of .........)
• Stereognosis (perception of ..... and ...... of objects by touch).

position
movement
Size and shape

16

Somatosensory afferents feed into ......... and also distribute to ......... .......... and cerebellum.

reflexes
cerebral cortex

17

Nociceptors (pain) = ....... ...... receptors

50% skin

18

Proprioceptive info transmitted via ....... ......., ......... ...... ...... and joint receptors

muscle spindles
golgi tendon organ

19

Larger receptive fields for areas of skin that ....... need ...... .........

don’t
fine resolution.

20

For ....... ........ sensation multiple small receptive fields, packed closely.

finer tactile

21

Two-point discrimination:
~ 2-3mm on ...... ......
~35-40mm on ......
~40mm on ......

Fingertips
Arm
Back

22

Somatotopic organisation:
each body region represented in a particular ....... .......

cortical area.

23

Represented in proportion to their sensory innervation – not
actual ....... .......

body size

24

Sensory pathways:
Cell bodies of the ....... ....... ...... for all pathways is located in the .....

first afferent neuron
DRG

25

Sensory pathways:
Typically cross the midline => ..........

contralateral

26

Sensory pathways:
Travel via ........ ........ through the ........ to ....... gyrus.

medial lemniscus
thalamus
postcentral

27

Sensory tracts:
Anterior (ventral) spinothalamic => ........ (non-discriminative) touch

crude

28

Sensory tracts:
Lateral spinothalamic => ......, ......., ......

itch, pain & temperature

29

Sensory tracts:
Fasciculus gracilis => fine touch, pressure, vibration, conscious proprioception of ....... .......

lower limb

30

Fasciculus cuneatus => fine touch, pressure, vibration conscious proprioception of ...... ......

upper limb

31

Spinocerebellar => ........... proprioception from .......... ........ ....... ...... ...... receptors to cerebellum.

unconscious
muscle spindles/tendon organs/joint & skin

32

Sensorimotor:
Voluntary movements require .......... feedback.

constant

33

Sensorimotor systems:
Cerebral cortex works with ...... ........, cerebellum & thalamus to....... & ......... movements.

basal ganglia
Plan and program

34

Sensorimotor systems:
Efferent fibres project through ........ and down spinal cord to effector muscles.

brainstem

35

Sensorimotor systems:
Afferent fibres project through ...... ...... Down to the brains

dorsal funiculus