Anatomy 2 quiz 1

which of the following fractures would be the least likely to cause a spinal cord injury

a fracture of vertebra L4

A mixed nerve consists of both __________ and ___________.

afferent and efferent fibers

in the patellar tendon reflex arc, the patellar ligament is stretched, which stretches the quadriceps femoris muscle of the thigh. this reflex will cause the quadricep femoris to

contract and the antagonist muscles, the hamstrings, to relax

the cervical plexus gives origin to the ___ nerves

phrenic

these are all properties of reflexes except

reflexes are spontaneous actions of the nervous system

a patient has a gunshot wound that caused a bone fragment to nick the spinal cord. the patient now feels no pain or temperature sensations from that level of the body down. most likely, the _____ was damaged

spinothalamic tract

the signals that control your handwriting travel down the spinal cord in

the corticospinal tracts

which of these is an ascending tract of the spinal cord

the gracile fasciculus

which of the following sensory functions involves neurons in the posterior root ganglia

touch

Nerve fibers in a given tract in the white matter are similar in origin, destination, and function.

true

the cross extension reflex is the contraction of the extensors on one side of the body when the flexors are contracted on the other side

true

gray matter contains

Neurosomas, dendrites, and proximal parts of axons of neurons

Some spinal nerves are sensory and others are motor.

false

most neurons are motor neurons

false

the spinal cord is divided into all of the following regions except

pelvic