nervous

white matter

dominated by myelinated axons

grey matter

dominated by neuron cell bodies, dendrites, synapses, and glial cells

astrocytes

contribute to BBB, support the neural microenvironment

oligodendrocytes

myelinate multiple CNS axons in white matter, but in grey matter it provides metabolic support as perineuronal satellite cells

ependymal cells

line ventricles & the central canal, modified ependymal cells participate in choroid plexus formation/CSF production

microglia

macrophages of the CNS

Which glial cell filters blood plasma from capillaries of the pia mater to form cerebrospinal fluid?

modified ependymal cells of the choroid plexus

arrangement of the layers of meninges

outer dura mater —> arachnoid mater —> inner pia mater

CSF is located in

the subarachnoid space btwn arachnoid and pia

dura mater

outer, thick/leathery dense CT layer

arachnoid mater

middle layer, arachnoid membrane w/trabeculae spanning the CSF-filled subarachnoid space

pia mater

thin/innermost highly vascular layer that is tightly adherent to brain/spinal cord and following sulci/fissures

grey matter of spinal cord

deep/central, butterfly region containing cell bodies subdivided into horns

white matter of spinal cord

superficial, contains ascending afferent and descending efferent axon tracts, subdivided into columns

dorsal horn

interneuron cell bodies, receives/synapses w/afferent sensory fibers

ventral horn

somatic/autonomic motor neuron cell bodies, sends efferent motor axons thru ventral roots

lateral horn

most prominent in thoracic cord, contains autonomic motor neuron cell bodies associated w/sympathetic pathways

dorsal root

carries sensry afferent fibers toward the spinal cord, contains the dorsal root ganglion

dorsal root ganglion

enlargement containing sensory neuron cell bodies

ventral root

carries motor efferent fibers away from the spinal cord, no ganglion

dorsal roots have

sensory afferent fibers

ventral roots have

motor efferent fibers

afferent fibers travel

toward the CNS thru dorsal roots

efferent fibers travel

away from the CNS thru ventral roots