Spinal Cord-- Ascending Systems Flashcards Preview

MHD2 Neuro > Spinal Cord-- Ascending Systems > Flashcards

Flashcards in Spinal Cord-- Ascending Systems Deck (15):
1

Function(s) of the Dorsal Column Pathway (DCP)

(1) 2 point discrimination
(2) Vibration sense
(3) Proprioception

2

What is Proprioception?

The ability to consciously sense positioning of a limb even with no visual stimulation. It is due to the perception of muscle spindle and Golgi tendon receptors.

3

What type of fibers make up the dorsal column pathway?

GSA

4

Important receptor types affiliated with the DCP

(1) Meissner's Corpuscle
(2) Pacinian Corpuscle
(3) Ruffini Ending
(4) Joint Receptor
(5) Neuromuscular Spindle
(6) Golgi Tendon Organs

5

Information below T6 is found

Medially in what is called the fasciulus gracillis

6

Information above T6, including the head, is found

Laterally in the fasciculus cuneatus

7

Medial lamiscus

Where second order fibers pile up after exiting the gracile and cuneate nuclei

8

How does the nervous signal end up at the opposite end from which it began?

Crosses the medulla at the internal arcuate fibers

9

Area 312 (broddman's area)

Somatosensory cortex. It handles afferent information

10

What area is in front of the central sulcus?

Area 4, which controls motor functions. It has efferent information.

11

What part of the body has its sensory towards the midline of the parietal cortex? Towards the lateral end?

From midline to lateral end:

Feet, hands, some head (minimal as CNV mainly handles this), large area for lips.

12

General path for dorsal column pathway

(1) Enters dorsal root
(2) 1st synapse- nucleus cuneatus/gracilis
(3) 2nd synapse- VPL (after traveling via medial lamiscus)
(4) 312 area

13

Dorsal spinocerebellar and ventral spinocerebellar tracts register...

Unconscious sensory

14

Rombwerg Sign

Loss of Tabes dorsalis

Issues with dorsal column pathway

Positive if person requires vision in order to stand steadily. Said to be positive for patients with dorsal column injury. Negative for cerebellar ataxia.

15

VPL

Ventral Posterolateral Nucleus

Receives information from the neospinothalamic trat and the medial lemniscus of the dorsal column and projects them to Brodmann's area 312