CH 17 HW
There are _______ pairs of cervical nerves, _________ pairs of thoracic nerves, __________ pairs of lumbar nerves, 5 pairs of sacral nerves, and 1 pair of coccygeal nerves
8; 12; 5
Which of theses subdivisions of the PNS regulate involuntary actions. ANS SNS CNS MNS
ANS
Which neuroglia form myelin sheaths in the PNS?
Schwann cells
What partially divides the spinal cord into right and left sides?
anterior and posterior median sulci
Which of the following is FALSE regarding the sciatic nerve? It: arises from the lumbar plexus splits at about the level of the knee into tibial and common fibular nerves is the largest nerve in the body sends branches to the hamstring muscles
arises from the lumbar plexus
Why are spinal nerves classified as mixed nerves?
because they contain both motor and sensory neurons
Neurons that have one main dendrite and one axon are bipolar unipolar multipolar pseudounipolar
bipolar
The _______ nervous system includes the brain and spinal cord, the ________ nervous system includes the cranial and spinal nerves.
central; peripheral
The superior enlargement of the spinal cord is the
cervical enlargement
What is the correct order of neuron parts in which a nerve impulse travels?
dendrites, cell body, axon, axon terminal, synaptic end bulb
An area of skin the provides sensory input to the CNS via one pair of spinal nerves is a
dermatome
The coverings of a spinal nerve from the most superficial to deep include
epineurium, perineurium, endoneurium
Select the muscle(s) served by the femoral nerve extensor muscles of knee joint adductor muscles of thigh gluteus maximus gastrocnemius and soleus muscles tibialis anterior and fibulas (peroneal) muscles
extensor muscles of knee joint
The Pia mater that extends from the conus medullar is to the coccyx is the
filum terminale
What types of problems could result from damage to motor neurons?
lack of control of skeletal muscles
Which of the following is NOT a correct description of the location of the brachial plexus? on the neck alongside the first four cervical vertebrae passes above the first rib posterior to the clavicle extends inferiorly and laterally on either side of the last few cervical and first thoracic vertebrae enters the axilla
on the neck alongside the first four cervical vertebrae
What is the name of this nerve, with origins from C3, C4, and C5 roots of the cervical plexus?
phrenic
Which spinal meninx is deep to the subarachnoid space?
pia mater
A network of axons that form on both sides of the body by joining with axons from anterior rami of adjacent nerves is a
plexus
Chemical synapses differ from electrical synapses in that chemical synapses release neurotransmitters are connected to the post synaptic cell via gap junctions contain connexons are faster to communicate than electrical synapses
release neurotransmitters
How is a spinal nerve connected to the spinal cord?
rootlets
Pain along the posterior and lateral sides of the leg extending from the buttock to the lateral side of the foot indicates compression or irritation to the _____ nerve.
sciatic
Which of the following nerves is NOT from the brachial plexus? musculocutaneous radial axillary sciatic ulnar
sciatic
Nerve impulses from ___________ travel along the posterior root of spinal nerves and nerve impulses from ________ travel along the anterior root of spinal nerves
sensory neurons; motor neurons
