15 terms

Brain and Spinal Cord

gray matter
contains cell bodies, dendrites, unmyelinated axons, and neuroglia
main site of synaptic contact between neurons
white matter
contains myelinated axons
tracts are bundles of myelinated axons that carry nervse signals within CNS
Brain Regions
continuous with spinal cord, components include medulla oblongata, pons, midbrain, reticular formation
posterior to brainstem, divided into hemispheres
components are thalamus, hypothalamus, epithalamus
occupies most of the cranium, divided into hemispheres
fibrous connective tissue coverings surrounding the brain and spinal cord
dura mater
outermost meninx
consists of dense irregular CT that lines the cranial cavity and surrounds the spinal cord
arachnoid mater
middle meninx
consists of delicate collagen fibers and some elastic fibers
pia mater
inner meninx
thin layer of transparent collagen and elastic fibers that adhere to the spinal cord and brain
epidural space
between the dura mater and wall of the vertebral canal
filled with blood vessels, adipose tissue, loose CT, only on spinal cord
subdural space
seperates sura mater and arachnoid mater
subarachnoid space
between arachnoid mater and pia mater
filled with cerebrospinal fluid
describes inflammation of the arachnoid mater and/or pia mater caused by bacteria and/or viruses that invade the central nervous system via the nose or throat
brain swells, ventricles enlarge, brainstem may hemmorhage
symptoms include high fever, stuff neck, drowsiness, intense headache, coma
death may occur within hours of onset