Spinal Nerves

Question 1

CNS

Answer 1

brain and spinal cord

Question 2

PNS

Answer 2

cranial, spinal, and ganlia

Question 3

ganglion

Answer 3

collection of neuron cell bodies outside CNS

Question 4

Sensory innervation

Answer 4

brings info from environment to CNS f

Question 5

Motor innervation

Answer 5

sends instructions from CNS to muscles and glands

Question 6

Motor neuron

Answer 6

found in CNS, no axon divided, cell body at the end

Question 7

electrical impulse direction of motor neuron

Answer 7

flows 1 direction to skeletal muscle

Question 8

electrical impulse direction of sensory neuron

Answer 8

flows 1 direction to CNS

Question 9

Sensory neuron structure

Answer 9

found in PNS, axon divided, cell body in the middle

Question 10

somatic

Answer 10

innervation with body wall

Question 11

viseral

Answer 11

innervation with internal organs

Question 12

Paraxial mesoderm

Answer 12

on either side of neural tube

Question 13

Dermomyotome

Answer 13

provides cells for dermis and striated muscle, where all structures are derived from

Question 14

Dermatome

Answer 14

region of skin innervated by branches of single spinal nerve

Question 15

Epaxial dermamyotomes

Answer 15

give rise to intrinsic (deep) back muscles and dermis that covers them; supplied by dorsi rami

Question 16

Hypaxial dermamyotomes

Answer 16

give rise to all other skeletal muscle and dermis below neck and limbs (extrinc); supplied ventral rami

Question 17

Sensory neurons location

Answer 17

dorsal horn of spinal gray matter

Question 18

Motor neuron location

Answer 18

ventral horn of spinal gray matter

Question 19

Ventral root

Answer 19

fusion of motor axons into a single bundle; will divide into dorsal ramus and ventral ramus

Question 20

Dorsal Root

Answer 20

Central process from ganglion that goes TOWARDS spinal cord

Question 21

Dorsal ramus

Answer 21

epaxial muscles

Question 22

ventral ramus

Answer 22

hypaxial muscles

Question 23

Paravertebral ganglia

Answer 23

• Ganglia lie lateral to developing vertebral bodies

- Send their axons into ventral ramus of nearby spinal nerve

Question 24

Gray ramus communicans

Answer 24

carries postganglionic axons to ventral ramus

Question 25

Preganglionic sympathetic axons

Answer 25

• all ventral roots T1-L2

- all spinal nerves and ventral rami from T1- L2

Question 26

White ramus communicans

Answer 26

white nerve bundle that communicates LATERAL. Only located between T1-L2. It can travel to other locations through sympathetic trunk

Question 27

Postganglionic neuron

Answer 27

cell body outside CNS, parasympathetic