Temp Pathway

Question 1

Temp Receptor?

Answer 1

Thermoreceptors

• responds to change in temp (not absolute temp)
• Non-nociceptive temps

Question 2

Type of temp afferent axon?

Answer 2

Delta
C

-Same pathway as the “primary pain” pathway

Question 3

The temp spinothalamic tract (STT) is located?

Answer 3

Anterolaterally in the spina cord

Located lateral in the brainstem

Question 4

The temp primary somatosensory cortex is?

Answer 4

Sensory homunculus somatotopic organization

Question 5

The primary somatosensory cortex inntervates?

Answer 5

Trunk, UE, hand, face represented superiorly and laterally on the postcentral gyrus.

LE represented medially on the posterior paracentral gyrus.

Question 6

The thermoreceptor is stimulated and?

Answer 6

An AP is generated and propagates along an Delta or C first-order afferent neuron (whose soma is in a DRG).

Central axon terminates in the dorsal horn of the entering spinal cord segment.

Question 7

The first-order afferent synapses with?

Answer 7

Second-order neuron in the dorsal horn second-order neuron crosses the spinal cord to the contralateral STT travels up the STT to the VPL nucleus of the thalamus.

Question 8

The second-order neuron does?

Answer 8

Synapses with third-order neuron in the VPL nucleus of the thalamus third order neuron goes to the primary somatosensory cortex in the parietal lobe and temperature change perception occurs.