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
