Somatosensory & Wiring Principles

Question 0

PNS consists of ___, ___ & ___.

Answer 0

enteric NS, neurons with cell bodies in PNS & process in both CNS & PNS & axons of neurons in PNS with their cell bodies in CNS

Question 1

What type of neurons live ENTIRELY outside the CNS?

Answer 1

enteric NS

Question 2

Sensory cell bodies are ____ (inside/outside) of the CNS.

Answer 2

OUTSIDE!!

VERY IMPORTANT!

Question 3

Motor neuron cell bodies are ___ (inside/outside) of the CNS.

Answer 3

INSIDE

VERY IMPORTANT!

Question 4

Cluster of cell bodies is a ___

Afferent (sensory) - axons ____ dorsal part of spinal cord

Efferent (motor) - axons ____ ventral part of spinal cord

Answer 4

ganglia

enter

leave

Question 5

Somatic (conscious control) deals with ___

Autonomic (unconscious control) deal with ___

Answer 5

skeletal muscle, joints, skin, etc.

smooth muscle, glands, etc.

Question 6

What are characteristics of primary afferent neurons?

Answer 6

cell bodies of 1st afferents live OUTSIDE the CNS
Primary afferents for somatic neurons end on the IPSILATERAL side of CNS
damage to primary afferents - lose part/all perception & reflex (if one exists)

Question 7

What neuron crosses the midline of the somatic afferent system?

Answer 7

secondary

Question 8

The primary afferents synapse onto the ___ order neurons & second order neurons cross the ___ of the CNS.

Sensory information on its way to the cortex goes through the ____

Answer 8

second; midline; thalmus

Question 9

Primary afferents NEVER cross!!

Answer 9

.

Question 10

Second order afferents for pain & temperature cross at the _____.

Secnd order afferents for touch & proprioception cross at the ____.

Answer 10

level they enter the spinal cord

at the level of the brainstem

Question 11

Pathways to the cerebellum -axons ____ (do or don’t) cross

Answer 11

DON’T - cerebellum receives information from ipsilateral side of body

axons DO NOT need to go through thalamus