anatomy final exam

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 these subdivisions of the PNS regulate involuntary actions

ANS

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

why are spinal nerves classified as mixed nerves?

because they contain both motor and sensory neurons

neurons that have one main dendrite and axon are

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 muscles served by the femoral nerve

extensor muscles of knee joint

the pia mater that extends from the conus medullaris 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

what is the 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

how is a spinal nerve connected to the spinal cord

rootlets

which neuroglia form myelin sheaths in the PNS

schwann cells

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?

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