Spinal Cord And Spinal Nerves

Front 1

Number of Spinal Nerves

Back 1

31 pairs

Front 2

Cervical Enlargement branches to

Back 2

Upper Limbs

Front 3

Lumbar Enlargement branches to

Back 3

Lower Limbs

Front 4

Dorsal Root contains ___ neurons

Back 4

Sensory

Front 5

Venral Root contains ___neurons

Back 5

autonomic, somatic motor

Front 6

Lateral Horn contains___neurons

Back 6

autonomic

Front 7

Anterior horn contains___neurons

Back 7

somatic potor

Front 8

Babinski sign caused by

Back 8

not enough myelination of axons

Front 9

Two types of reflex acs

Back 9

Somatic, Autonomic

Front 10

Most sensory neuronse synapse in the

Back 10

spinal cord

Front 11

Basic Reflex Arc

Back 11

Sensory Receptor--->Sensory Neuron-->Interneurons--->Motor Neurons--->Effector Organ

Front 12

Stretch Reflex
___respond to stretch

Back 12

Response to stretching force; muscle spindle

Front 13

Stretch Reflex does not use

Back 13

interneuron

Front 14

Stretch reflex uses___motor neurons

Back 14

Gamma, control muscle spindle

Front 15

Muscle Spindles of Stretch Reflex innervated by

Back 15

sensory neurons

Front 16

Stretch Reflex Pathway

Back 16

Sensory Neurons-->alpha motor neurons->stimulation of alpha motor neurons

Front 17

Golgi tendom reflex

Back 17

Apply excessive tension, cause relaxation to prevent muscle damage

Front 18

Golgi Tendon pathway

Back 18

Sensory neuron-->inhibitory neuron-->aplha motor neuron

Front 19

Withdrawal Reflex, 2 parts

Back 19

Removal from stimulus, reciprocal innervation and crossed extensor reflex

Front 20

Recriprocal innervation

Back 20

in withdrawal, relaxation of extensor muscle to allow flexor contraction

Front 21

Withdrawal reflex pathway

Back 21

Sensory neuron-->exitatory interneuron-->alpha motor neuron

Front 22

Withdrawal w/ reciprocal innervation

Back 22

Sensory neuron--> Inhibitory neuron(extensor) AND excitatory neuron-->alpha motor neuron

Front 23

Withdrawal w/ Crossed Extensor Reflex pathway

Back 23

Sensory Neuron--->Excitatory neuron for R and L ---> alpha motor neuron to extensor on one leg, to flexor on the other

Front 24

Cervical Plexus

Back 24

C1-C4
Innervates Superficial neck structures, skin of neck, posterior portion of head

Front 25

Brachial Plexus, 5 branches

Back 25

C5-T1
Axillary, Radial, Musculocutaneous, Ulnar, Median

Front 26

Lumbar Plexus, 4 portions

Back 26

L1-L4
Obturator, Femoral, Tibial, Common Fibular(peroneal)

Front 27

Sacral Plexus

Back 27

L4-S4

Front 28

Coccygeal Plecus

Back 28

S4, S5

Front 29

Phrenic Nerve

Back 29

Portion of choroid plexus that innervates diaphragm

Front 30

Axillary Nerve Fuction

Back 30

Lateral Rotation of teres minor, abducts arm, innervates skin of shoulder

Front 31

Radial Nerve Function

Back 31

Movement at elbow, wrist, and thumb
Skin on posterior surface of arm and forearm, lateral 2/3 of dorsum of hand

Front 32

Musculocutaenous Nerve

Back 32

Movements at shoulder, elbow, wrist

Skin on lateral surface of forearm

Front 33

Ulnar Nerve

Back 33

Movements at wrist, fingers, hand

skin on medial 1/3 of hand, little finger, and medial 1/2 of ring finger

Front 34

Median Nerve

Back 34

Movement of wrist, fingers, thumb

skin on lateral 2/3 of palm, thumb, index, middle fingers; lateral 1/2 of ring finger and dorsal tips of fingers

Front 35

Obturator Nerve

Back 35

adduction of knee and thigh, hip rotation
skin on superior middle side of thigh

Front 36

Femoral Nerve

Back 36

Movements of hip and knee

skin on anterior and lateral thigh, medial leg and foot

Front 37

Sciatic Nerve

Back 37

Tibial+Peroneal

Front 38

Tibial Nerve

Back 38

movement of hip, knee, toes

no skin

Front 39

Common Fibular

Back 39

Anterior and lateral muscles of leg and foot

skin on lateral and anterior leg, dorsum of foot

Front 40

Coccygeal Plexus/Nerve

Back 40

Muscles of Pelvic Floor