Spinal Cord and PNS: Sensory pathways Flashcards Preview

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Flashcards in Spinal Cord and PNS: Sensory pathways Deck (12):
1

What are the 3 ascending pathways?

1) SPINOCEREBELLAR PATHWAY
2) POSTERIOR COLUMN PATHWAY
3) SPINOTHALAMIC PATHWAY

2

What are some characteristics of the SPINOCEREBELLAR PATHWAY?

- Proprioception from muscles, joints, tendons
- Ends at CEREBELLUM
- Not aware of this stimulus
- Info used to fine tune movement

3

What are some characteristics of POSTERIOR COLUMN PATHWAY?

- Fine touch, pressure, vibration
- Cross over in MEDULLA OBLONGATA
- Synapse in THALAMUS
- Ends at SOMATOSENSORY CORTEX
- Aware of this stimulus

4

What are some characteristics of SPINOTHALAMIC PATHWAY?

- Crude touch, pain, itch, temp.
- Cross over in SPINAL CORD
- Synapse in THALAMUS
- Ends at SOMATOSENSORY CORTEX
- Aware of this stimulus

5

What are some similarities between all 3 ascending pathways?

- All pass through the DORSAL ROOT GANGLION and DORSAL ROOT
- All synapse in POSTERIOR GREY HORN
- All go through WHITE COLUMNS (myelinated AXONS)
- Multiple NEURONS in pathway

6

Which pathway would a touch on the right arm take?

POSTERIOR COLUMN PATHWAY

7

Where can SENSORY NEURONS enter the SPINAL CORD?

1) DORSAL RAMUS
2) VENTRAL RAMUS
3) SYMPATHETIC NERVE

8

Where are all the CELL BODIES of the SENSORY NEURONS?

In the DORSAL ROOT GANGLION

Don't fuck with the Dorsal Root Gang >:)

9

Where do the AXONS pass through on their way to the SPINAL CORD?

The DORSAL ROOT

10

Where do all the SENSORY NEURONS synapse when they are entering the SPINAL CORD?

At the POSTERIOR GREY HORN

11

Through which 3 columns can SENSORY NEURONS ascend to the BRAIN?

1) POSTERIOR WHITE COLUMN
2) LATERAL WHITE COLUMN
3) ANTERIOR WHITE COLUMN

12

Describe, in full, the route a SENSORY NEURON would take to enter the BRAIN

- Arrive at either DORSAL RAMUS, VENTRAL RAMUS, or SYMPATHETIC NERVE
- Pass through DORSAL ROUTE GANGLION
- Pass through DORSAL ROOT
- Pass through POSTERIOR GREY HORN
- Ascend to the BRAIN via either the POSTERIOR WHITE COLUMN, LATERAL WHITE COLUMN, or ANTERIOR WHITE COLUMN