Chapter 13: The Peripheral Nervous System (Continued)

Question 1

Do ventral rami form plexuses?

Answer 1

No, but they are in a segmental pattern

Question 2

What is the function of Thorax?

Answer 2

Serves the muscles between ribs, skin of the anterior part of the thorax and most of the abdominal wall

Question 3

Dorsal ramus function

Answer 3

Innervates a narrow strip of muscle and skin at the same area where it emerges from spinal column

Question 4

Skin (Dermatones)

Answer 4

Area of skin innervated by a single spinal nerve

Question 5

What is the function of dermatones

Answer 5

Provides sensory details ( pressure, temperature, pain ) of the skin to the brain

Question 6

Reflex arc

Answer 6

Response that enables rapid and predictable responses by the body

Question 7

Intrinsic reflex

Answer 7

Unlearned, built in responses. Ex: Jerking hand back from hot stimulus, dropping something and picking it up

Question 8

Acquired reflex

Answer 8

Results from practice or repetition
Ex: Driving a car

Question 9

Receptor

Answer 9

Site of stimulus action

Question 10

Sensory neuron

Answer 10

Transmits afferent impulses to the CNS

Question 11

Integration center

Answer 11

Synapses found in the CNS

Question 12

Motor neuron

Answer 12

Conducts efferent impulses from the integration center to the effector organ

Question 13

Effector

Answer 13

Muscle fiber or gland that responds to the efferent impulse

Question 14

Spinal reflex

Answer 14

Any somatic reflex that is mediated by the spinal cord. Most occur without any higher CNS involvement

Question 15

What does the brain do during a spinal reflex?

Answer 15

The brain is not controlling anything but it is made aware of what is happening

Question 16

Stretch reflex

Answer 16

Prevents muscle from overstretching by forcing it to contract

Question 17

Stretch reflexes are monosynaptic and ipsilateral

Answer 17

Monosynaptic - Have only a single synapse between the sensory neuron and a motor neuron

Ipsilateral: The stimulus and response occur on the same side of the body

Question 18

Muscle spindles

Answer 18

Proprioceptors that Provide information about the length of a particular muscle

Question 19

What is an example of a muscle spindle

Answer 19

The knee jerk reflex

Question 20

Tendon organs

Answer 20

Provide information about the amount of tension in a muscle and its associated tendons

Question 21

Tendon reflex

Answer 21

Forcing a muscle to relax and lengthen

Question 22

Polysynaptic

Answer 22

Sensory neuron is involved with a motor neuron and an interneuron

Question 23

Flexor reflex (withdrawal reflex)

Answer 23

Initiated by painful stimuli, causes automatic withdrawal of body part from stimulus source

Question 24

Can the flexor reflex be overridden?

Answer 24

Yes. Someone can know they’re about to be in pain and override the withdrawal reflex w the conscious mind. Ex: going to the doctors for a shot

Question 25

Crossed-extensor reflex

Answer 25

Accompanies flexor reflex prevalent in weight bearing limbs

Question 26

The crossed extensor reflex is contralateral , what does this mean

Answer 26

The stimulus and response occur on opposite sides of the body. Ex: stepping on a Lego and weight shifting to other foot as u lift injured foot up