Ch 14 the Brain Stem

Question 1

spinal cord

Answer 1

ends at L1 vertebra with conus medullaris, extends inferiorly as cauda equina
divided into cervical, thoracic, lumbar, sacral, and coccygeal

Question 2

filum terminae

Answer 2

thin strand of pia attaching conus medullaris to coccyx

Question 3

superiormost nerve

Answer 3

C1 nerve

Question 4

inferiormost nerve

Answer 4

Co1 nerve

Question 5

sensory nerves (what side of spinal cord)

Answer 5

posterior

Question 6

motor nerves (what side of spinal cord)

Answer 6

anterior

Question 7

what is important to remember about names?

Answer 7

spinal cord parts do not align w vertebral names

Question 8

grooves on spinal cord

Answer 8

anterior median fissure and posterior median sulcus

Question 9

anterior horns

Answer 9

cell bodies of somatic motor neurons

Question 10

lateral horns

Answer 10

cell bodies of autonomic motor neurons

Question 11

posterior horns

Answer 11

axons of sensory neurons and cell bodies of interneurons

Question 12

grey and white matter in spinal cord

Answer 12

grey on inside, white outside

Question 13

motor pathways

Answer 13

control effectors such as skeletal muscles
upper motor neuron in motor cortex, cerebral nucleus, or brainstem contacts lower motor neuron in nerve nucleus or spinal cord anterior horn

Question 14

somatosensory pathways receive signals from…

Answer 14

signals from skin, muscles, joints

Question 15

viscerosensory pathways

Answer 15

carry signals from viscera

Question 16

primary neuron (1st order)

Answer 16

“sensor”
neuron has peripheral ending, cell body in posterior root ganglion, axon leading to secondary neuron

Question 17

secondary neuron (2nd order)

Answer 17

“relay”
interneuron, receives primary input and extends to tertiary neuron or cerebellum

Question 18

tertiary neuron (3rd order)

Answer 18

interneuron, receives secondary neuron input and extends to somatosensory cortex

Question 19

another name for somatic motor pathways

Answer 19

corticospinal tracts

Question 20

another name for sensory pathways

Answer 20

anterolateral pathway