BIOL 241 Exam #4

Found in the brain and spinal cord, dense collections of myelinated fibers.(Outter layer)

Found in the brain and spinal cord, mostly neuron cell bodies and unmyelinated fibers.(Inner layer)

Are large collecting veins located within the dural folds

Gyri-series of ridges formed by the cerebral cortex that serve to increase its surface area. Gyrus-a prominent fold or ridge of neural cortex on the surfaces of the cerebral hemisphere.

These are the shallow depressions that help seperate the Gyri/Gyrus

These are the deep depressions that help seperate the Gyri/Gyrus

Covers the surface of the cerebral hemispheres(superficial layer of neural cortex)

A large bundle of axon's that links centers in the left and right cerebral hemisphere.(bands of commissural fibers,200 million axons, 4 billion impulses per second)

Interconnect and permit communication between the cerebral hemispheres.(corpus callosum and anterior commissure)

Interconnect areas of cerebral cortex within a single cerebral hemisphere. (Short A.fibers-arcuate fibers-curve in an arc to pass from gyrus to gyrus, Long A.fibers-longitudinal Fasciculi-connect frontal lobe to other lobes of same hemisphere

Link the cerebral cortex to the diencephalon,brain stem,cerebellum and spinal cord. All projection fibers must pass through the diencephalon.(Entire collection of projection fibers is known as internal capsule)

The central, branching(looks like a tree) mass of white matter inside the cerebellum.

The group of nuclei and tracts along the border between the cerebrum and diencephalon that are involved with emotional states, memories and behavioral drives.

The mesencephalic portion of the reticular formation. Responsible for arousal and the maintenance of consciousness.

Are filled with cerebrospinal fluid(CSF) The CSF continuously circulates from the ventricles and central canal into the subarachnoid space of the surrounding cranial meninges.