NS A&P

Question 1

CNS

Answer 1

Brain and spinal cord

Question 2

PNS

Answer 2

Cranial/spinal nerves and autonomic NS

Question 3

CNS ascending tract

Answer 3

Carry sensory info from periphery, muscles and organs to higher CNS

Question 4

Descending tract of CNS

Answer 4

• carry impulses from the brain and result in voluntary muscle mvt

Question 5

Functional unit of NS

Answer 5

Neuron
- don’t divide or replace but may be generated from stem cells after an injury

Question 6

Neuroglia

Answer 6

• can replicate
• supportive to the neuron–nourish and protect
• when neurons die, tissue is replaced with neuroglia
• more numerous than neurons

Question 7

Neuron cell body

Answer 7

Metabolic center of the neuron

Question 8

Dendrites

Answer 8

short extensions from the body
that receive and conduct nerve impulses

Question 9

Axons

Answer 9

extend varying distances from the cell
body and carry nerve impulses. They can be myelinated or unmyelinated

Question 10

Myelin sheath

Answer 10

White lipid substance that insulated and helps conduct the impulses

Question 11

Oligodendrocytes

Answer 11

Make myelin sheath for nerve fibers in CNS
- white matter

Question 12

Schwann cells

Answer 12

Myelinated nerve fibers in periphery

Question 13

Astrocytes

Answer 13

Structural support to neurons and form BBB
- gray matter

Question 14

Nerve impulse

Answer 14

• initiated by generation of an action potential
• APs travel along axon to junction
• NTs transmit signal across junction

Question 15

Synapse

Answer 15

Point when nerve impulse jumps from one neuron to another