TBL 5

Question 1

Somatosensory

Answer 1

bodily sensation of touch, pain, temperature, vibration, and proprioception

Question 2

Posterior Column-Medial Lemniscal Pathway (PCML)

Answer 2

Conveys proprioception, vibration, and fine touch

• First Order: enters spinal cord via the dorsal root and ascends ipsilaterally within the dorsal column
• Second Order:

Question 3

Anterolateral Pathways (Spinothalamic Tracts)

Answer 3

Convey temperature, pain, and crude touch

• Archispinothalamic Tract
• Paleoepinothalamic Tract
• Neospinothalamic Tract

Question 4

Proprioception

Receptor and Fxn

Answer 4

Receptor: muscle spindles and golgi tendon organ
Fxn: senses change in muscle length and tension

Question 5

Fine Touch

Receptor and Fxn

Answer 5

Receptor: meissner’s corpuscles and merkel’s receptor
Fxn: sensitive to mechanical deformation of the skin

Question 6

Deep Touch and Vibration

Receptor and Fxn

Answer 6

Receptor: pacinian corpuscle, ruffini ending, an hair receptor
Fxn: sensitive to mechanical deformation of the skin and movement of hairs

Question 7

Temperature

Receptor and Fxn

Answer 7

Receptor: bare nerve ending
Fxn: sensitive to changes in temperature

Question 8

Pain

Receptor and Fxn

Answer 8

Receptor: bare nerve endings
Fxn: sensitive to high levels of mechanical, temperature, or chemical stress

Question 9

Secondary Somatosensory Association Cortex

Answer 9

• located within the Sylvian fissure along its superior border

Question 10

Parietal Association Cortex

Answer 10

• caudal to the primary somatosensory cortex in the superior parietal lobe

Question 11

Fasciculus Gracilis

Answer 11

• located medially

- conveys sensory information from the periphery of dermatomes below T5 (legs and lower trunk)

Question 12

Fasciculus Cuneatus

Answer 12

• located laterally

- conveys sensory information from the periphery of dermatomes above T5 and above

Question 13

Archispinothalamic Tract

Answer 13

• C fibers
• not somatotopically mapped
• stimulate the brainstem reticular formation (increase alertness), periaqueductal gray matter (endogenous pain modulating system), hypothalamus (visceral and autonomic response to pain), and limbic system (emotional responses to pain)

Question 14

Paleospinothalamic Tract

Answer 14

• C fibers
• not somatotopically mapped
• stimulates the brainstem reticular formation (increase alertness), periaqueductal gray matter (endogenous pain modulating system), and intralaminar thalamic nuclei (projects to the frontal, cingulate cortex, and insular cortex)

Question 15

Neospinothalamic Tract

Answer 15

• A delta fibers
• somatotopically mapped
• conveys pain, temperature, and crude touch sensations to the cortex