Somatic nervous system

Question 1

what is a neuron

Answer 1

functional unit of ns
cell body (soma), dendrites, axon

Question 2

what types of neuron are there

Answer 2

bipolar, multipolar, pseudounipolar

Question 3

what is the myelin sheath

Answer 3

insulating layer around nerves
myelin - lipid + protein substance
secreted by schwann cells (glial) around some axons
increases velocity of impulse conduction

Question 4

what is myelin secreted from

Answer 4

schwann cells (glial)

Question 5

what 3 layers of connective tissue cover nerves

Answer 5

epineurium
perineurium
endoneurium

Question 6

whats a dermatome

Answer 6

area of skin supplied by single spinal nerve

Question 7

whats a myotome

Answer 7

part of muscle supplied by single spinal nerve

one muscle myotome may involve multiple spinal segments

Question 8

what is a motor end plate

Answer 8

neuromuscular junction

Question 9

what 2 systems are in the NS

Answer 9

central NS

peripheral NS

Question 10

what 2 parts are there in the NS

Answer 10

somatic and visceral -> autonomic

Question 11

what is the somatic NS

Answer 11

regulate voluntary control of body via skeletal muscle

transmit general sensation (pain, touch, temperature, proprioception) to CNS

Question 12

are roots sensory, motor or both

Answer 12

roots are sensory OR motor

Question 13

what does the spinal nerve exit through

Answer 13

the intervertebral foramen

Question 14

what is somatic reflex arc

Answer 14

sensory detection

interpretation of sensory input in the CNS motor response