organization of the nervous system

dorsal root transmits what information

sensory information coming in

above the midbrain anterior =

rostral

above the midbrain posterior =

caudal

above the midbrain superior =

dorsal

above the midbrain inferior =

ventral

ventral root transmits what information

motor information coming out

efferent fibers

motor fibers going away from the CNS

afferent fibers

sensory fibers going toward the CNS

dorsal ramus has what information

mix of motor and sensory

ganglia

collection of cell bodies within the PNS

cell bodies

communication spot for transmitting signals between neurons

dendrites

receives information from other neurons

autonomic and somatic belongs to:

PNS

somatic system

voluntary control

autonomic system

involuntary

sympathetic and parasympathetic

what levels does the fight/flight response come from

thoracolumbar (T1-L3)

sympathetic

what level does the relax/digest response come from

craniosacral

parasympathetic

what does the ventral rami form

T2-T12

forms intercostal nerve - ventral and lateral

what is gray matter consist of

cell bodies

what is white matter consist of

axons and myelin

ascending pathways carry __ information

sensory

descending pathways carry __ information

motor

columns are lumped together by

location

fascicles are lumped together by

location and function

cuneate fascicles carry information from

head, neck, upper trunk, arm

gracile fascicules carry information from

lower trunk and leg

funiculus

large zone of white matter

clumped by location

somatosensory cortex is __ to the central sulcus

posterior

somatomotor cortex is __ to the central sulcus

anterior

tract

made up of cell bodies, axons, dendrites functionally related

pathway

system of tracts that work together for a specific function

ex: visual pathway

brachium

branch of fibers connecting one structure to another

peduncle

large bundle of fibers that travel together

functionally related

decussation

fibers crossing from one side to the other

(make an X)

leminiscus

axons that travel together and functionally related

carry the same type of information

commissure

point of crossing - shorter distance than decussation

(joining together)

medial part of homunculus emphasizes what

legs / LE

lateral part of homunculus emphasizes what

head / UE