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40 Cards in this Set

  • Front
  • Back
Number of Spinal Nerves
31 pairs
Cervical Enlargement branches to
Upper Limbs
Lumbar Enlargement branches to
Lower Limbs
Dorsal Root contains ___ neurons
Sensory
Venral Root contains ___neurons
autonomic, somatic motor
Lateral Horn contains___neurons
autonomic
Anterior horn contains___neurons
somatic potor
Babinski sign caused by
not enough myelination of axons
Two types of reflex acs
Somatic, Autonomic
Most sensory neuronse synapse in the
spinal cord
Basic Reflex Arc
Sensory Receptor--->Sensory Neuron-->Interneurons--->Motor Neurons--->Effector Organ
Stretch Reflex
___respond to stretch
Response to stretching force; muscle spindle
Stretch Reflex does not use
interneuron
Stretch reflex uses___motor neurons
Gamma, control muscle spindle
Muscle Spindles of Stretch Reflex innervated by
sensory neurons
Stretch Reflex Pathway
Sensory Neurons-->alpha motor neurons->stimulation of alpha motor neurons
Golgi tendom reflex
Apply excessive tension, cause relaxation to prevent muscle damage
Golgi Tendon pathway
Sensory neuron-->inhibitory neuron-->aplha motor neuron
Withdrawal Reflex, 2 parts
Removal from stimulus, reciprocal innervation and crossed extensor reflex
Recriprocal innervation
in withdrawal, relaxation of extensor muscle to allow flexor contraction
Withdrawal reflex pathway
Sensory neuron-->exitatory interneuron-->alpha motor neuron
Withdrawal w/ reciprocal innervation
Sensory neuron--> Inhibitory neuron(extensor) AND excitatory neuron-->alpha motor neuron
Withdrawal w/ Crossed Extensor Reflex pathway
Sensory Neuron--->Excitatory neuron for R and L ---> alpha motor neuron to extensor on one leg, to flexor on the other
Cervical Plexus
C1-C4
Innervates Superficial neck structures, skin of neck, posterior portion of head
Brachial Plexus, 5 branches
C5-T1
Axillary, Radial, Musculocutaneous, Ulnar, Median
Lumbar Plexus, 4 portions
L1-L4
Obturator, Femoral, Tibial, Common Fibular(peroneal)
Sacral Plexus
L4-S4
Coccygeal Plecus
S4, S5
Phrenic Nerve
Portion of choroid plexus that innervates diaphragm
Axillary Nerve Fuction
Lateral Rotation of teres minor, abducts arm, innervates skin of shoulder
Radial Nerve Function
Movement at elbow, wrist, and thumb
Skin on posterior surface of arm and forearm, lateral 2/3 of dorsum of hand
Musculocutaenous Nerve
Movements at shoulder, elbow, wrist

Skin on lateral surface of forearm
Ulnar Nerve
Movements at wrist, fingers, hand

skin on medial 1/3 of hand, little finger, and medial 1/2 of ring finger
Median Nerve
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
Obturator Nerve
adduction of knee and thigh, hip rotation
skin on superior middle side of thigh
Femoral Nerve
Movements of hip and knee

skin on anterior and lateral thigh, medial leg and foot
Sciatic Nerve
Tibial+Peroneal
Tibial Nerve
movement of hip, knee, toes

no skin
Common Fibular
Anterior and lateral muscles of leg and foot

skin on lateral and anterior leg, dorsum of foot
Coccygeal Plexus/Nerve
Muscles of Pelvic Floor