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Neuro > Spinal Cord Ascending System : (DCP and STT) > Flashcards

Spinal Cord Ascending System : (DCP and STT) Flashcards

1
Q

Information carried by the Dorsal Column Pathway

A

2-point discrimination

vibration sense

proprioception (helps you know where your hands and limbs are in the dark)

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2
Q

Receptors for DCP

A

2 point discrimination: Meissner’s corpuscle

Vibration: Pacinian Corpuscle

Joint position: Joint receptors

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3
Q

morphology of midbrain cross section:

A

upside mickey mouse called cerebral peduncles

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4
Q

cerebral peduncles

A

they connect the midbrain to the cerebral cortex

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5
Q

substantia naigra

A

blacks substance found in the midbrain.

produces dopamine

responsible for Parkinson’s when it is damaged

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6
Q

Pathway of information via the DCP

A

first order fibers: synapse in the nucleus cuneatus in medulla

second order fibers: (travels through the medial lemniscus) synapse in the thalamus

third order fibers: synapse in area 312 of the cortex

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7
Q

where in the central cortex is most of the sensory information located?

A

Postcentral Gyrus

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8
Q

Pre central Gyrus

A

Motor information

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9
Q

Area 4

A

precentral gyrus

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10
Q

area 312

A

postcentral gyrus

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11
Q

area 17

A

vision

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12
Q

functional component carried in DCP

A

GSA

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13
Q

What senses position, vibration and pain in the head?

A

Trigeminal ganglion

DCP does not sense pain and vibration, proprioception in the head

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14
Q

nucleus cuneatus

A

nucleus in the medulla where the first order axons from upper limb synapse.

No fascilculus cuneatus after T6.

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15
Q

medial lemniscus (ribbon)

A

made up of thousands of axons from DCP that pile up in the midline of the medulla.

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16
Q

nucleus of second order axons

A

Ventral Posterior Lateral nucleus. (VPL)

Location: thalamus

17
Q

stroke/injury to the right thalamus

A

loss of sensation on the left side (opposite side)

18
Q

knife wound on the right side of the spinal cord (DCP)

A

loss of sensation on the right side (same side)

19
Q

third order axons termination

A

area 312 of the post central gyrus.

location: cortex

20
Q

internal arcuate fibers

A

name for the fibers of second order fibers

crosses the midline

21
Q

nucleus gracilis

A

handles lower limb sensory information.

location: medulla.

The rest of the lower limb DCP is the same as upper limb.

22
Q

fasciculus cuneatus

A

first order neurons that transmits information from C1-T6 to the medulla.

used by DCP and Dorsal spinocerebellar tract

location: spinal cord (C1-T6).

23
Q

fasciculus cuneatus vs nucleus cuneatus

A

fasciculus cuneatus: axons located in the spinal cord

nucleus cuneatus: cell bodies located in the medulla

24
Q

Tabes Dorsalis

A

wipes out the dorsal column pathway

25
Q

Positive Romberg’s sign

A

Loss of proprioception: patients cannot stand steadily when their eyes are closed.

Indicates problems with DCP

26
Q

Draw the DCP

A

Draw the damn thing

27
Q

Spinothalamic Tract (STT)

A

classic PAIN pathway.

28
Q

Pathway of Spinothalamic tract

A

first order synapse in Nucleus Proprius of Spinal Cord.

Second order fibers cross the midline at spinal cord and synapse in the VPL

3rd order fibers synapse in Area 312 of the cortex

29
Q

Laterality of DCP

A

contralateral once it crosses midline at medulla.

crosses midline at medullary level

30
Q

Laterality of Spinothalamic tract

A

contralateral at spinal cord level.

Crosses midline at spinal cord level

31
Q

myelination of pain sensory fibers

A

lightly myelinated: enter spinal cord via LATERAL DiVISION

32
Q

Lateral Division of Dorsal Root Afferent

A

Entrance of:

Pain fibers
Temperature
Light Touch
visceral afferents

33
Q

lesion of DCP at spinal cord level

A

ipsilateral: loss of sensation on the same side of the body

34
Q

lesion of DCP at the brain

A

contralateral: loss of sensation on the opposite side

35
Q

lesion of Spinothalamic tract at spinal cord level

A

contralateral: loss of sensation on the opposite side of the body.

36
Q

lesion of spinothalamic tract at brain level

A

contralateral loss of sensation

37
Q

Syphilis

A

Wipes out posterior column (of Dorsal Column Pathway) and Dorsal Root Ganglion

Neuro (5 decks)

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