a&p quiz 34

tracts

(pathways)- collections of myelinated axons in the CNS; subdivisions of columns

arachnoid mater

(spider like)- thin wispy middle meningeal layer

pia mater

(tender mother)- deepest meningeal layer that is very tightly bound to the surface of the SC

dura mater

(tough mother)- most superficial and thickest meningeal layer

lumbar puncture (spinal tap)

CSF is removed from the subarachnoid space to examine for infection of hemorrhage

meninges

CT membranes that cover the SC and brain

fissure

a deep grove in a bone

epidural anesthesia

anesthetics delivered into the epidural space, as in childbirth

anterior horn

anterior portion of the gray matter of each half of the SC

a sensory neuron

conducts action potentials throughout the nerve and dorsal root to the spinal cord

a motor neuron axon

conducts action potentials throughout the ventral root and spinal nerve to an effector organ

gray commissure

connects the gray matter from both sides of the SC

white commissure

connects the white matter from both sides of the SC

anterior median fissure

deep cleft that partially separates the anterior halves of the SC

posterior median fissure

deep cleft that partially separates the posterior halves of the SC

a sensory receptor

detects a stimulus

thecae sac

dura mater sac the surrounds the spinal cord- also known as dural sac

cerebrospinal fluid (CSF)

fluid that acts to support and nourish the brain and SC

denticulate ligaments

lateral pia mater extensions from the Sc to the dura mater

central canal

opening in the center of the grey commissure that helps to circulate CSF

columns

organization of the white mater of the SC; 3 on each half of the SC -ventral: anterior -dorsal: posterior -lateral

film terminale

pia mater that extended inferiorly from the conus medullar is to anchor the SC to the coccyx

posterior horn

posterior portion of the gray matter of each half of the SC

subdural space

potential space between the dura mater and arachnoid mater

subarachnoid space

real space in between the arachnoid mater and Pia mater that contains blood vessels and cerebrospinal fluid

5 components of a reflex are

sensory receptor sensory neuron interneuron motor neuron effector organ

lateral horn

small portions of the gray matter found at vertebral levels associated with the ANS

potential space

something in contact that there could be a space if something were to make it a space

epidural space

space between the dura mater and periosteum of the vertebral canal

epidural space contains

spinal nerve roots, blood vessels, areolar CT, adipose tissue

dorsal root ganglion

swelling of the dorsal root that contains a collection of neuron cell bodies

reflex arc

the basic functional unit of the nervous system, simplest portion capable of receiving a stimulus and producing a response

neuron

the basic structural unit of the nervous system

dorsal root

the portion of a spinal nerve that arises from 6-8 dorsal rootlets

ventral root

the portion of a spinal nerve that arises from 6-8 ventral rootlets

in the spinal cord

the sensory neuron synapses with an interneuron

sensory neurons are mixed

they have sensory and motor neurons

the interneuron synapses

with motor neuron