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Cranium

Nervous System/Brain

TermDefinition
gray matter derives its color from the motor neuron and interneuron cell bodies and their associated capillary beds, as well as the neuronal dendrites and some unmyelinated axons.
white matter derives its color from the myelin on the abundant myelinated axons.
meninges 3 connective tissue layers that separate and support the soft tissue of the brain from the bones of the cranium, enclose and protect some of the blood vessels that supply the brain, and help contain and circulate cerebrospinal fluid.
pia mater the innermost of the cranial meninges; a thin layer of delicate areolar connective tissue that tightly adheres to the brain and follows every contour of the brain surface.
arachnoid mater -external to the pia mater -"resembling a spider web" -partially composed of a delicate web of collagen and elastic fibers
subarachnoid space -deep to arachnoid mater -contains cerebrospinal fluid
dura mater -an external, tough dense irregular connective tissue layer composed of two fibrous layers. -the strongest of the meninges
superior sagittal sinus -run within the margins of either end of the dural septa -dural venous sinus
cerebrospinal fluid -a clear, colorless liquid that circulates in the ventricles and subarachnoid space. -bathes the exposed surfaces of the central nervous system and completely surrounds it FUNCTIONS: -Buoyancy -Protection -Environmental stability
choroid plexus -forms cerebrospinal fluid -a region of specialized tissue in each ventricle -composed of a layer of ependymal cells and the blood capillaries that lie within the pia mater
blood-brain barrier -protects nervous tissue from the general circulation -strictly regulates which substances can and cannot enter the interstitial fluid of the brain
corpus callosum -largest of white matter tracts -connects the hemispheres -provides the main method of communication between these hemispheres
longitudinal fasciculi -longer association tracts -connect gyri in different lobes of the same hemisphere -example: the tract that connects the Wernicke area to the motor speech area
projection tracts -link the cerebral cortex to both the inferior brain regions and the spinal cord example: corticospinal tracts that carry motor signals from the cerebrum to the brainstem and spinal cord.
Created by: ahasenmu