Glossary of CNS 1
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- -Cerebrum; the adult forebrain
-two cerebral hemispheres
- Corpus Callosum
- -a gigantic fiber bundle of axons connecting the two cerebral hemispheres.
-allows communication between each side.
-obviously white matter
- cerebral cortex
- superficial layer of the brain; gray matter (nerve cells) surrounding white matter.
- Prosencephalon (Telencephalon in adult)
- Functions of the Cerebrum
- -All intellectual functions;
-Conscious thought processes;
-Skeletal muscle contraction regulation.
- gyri, sulci, fissures
- elevated ridges, shallow depressions, and deeper grooves (respectively) that provide increased surface area on the cerebral hemispheres for additional cortical neurons.
- longitudinal fissure
- seperates the two cerebral hemispheres;
- lateral sulcus
- inferior border of frontal lobe; superior border of temporal lobe. extends from central sulcus (middle of head) anteriorly toward face.
- insular lobe
- island of cortex, deep to the temporal lobe. inferior to frontal lobe.
- parieto-occipital sulcus
- transverse across back of head, divides the parietal lobe from occipital lobe.
- Major sulci or fissures
- central sulcus
- major gyri
- central sulcus
- extends lateraly from longitudinal fissure; seperates frontal lobe from parietal lobe (or precentral gyrus from postcentral gyrus; also could be said, seperates motor and sensory portions of the cerebral cortex.
- precentral gyrus
- -primary motor cortex (surface);
-neurons are pyramidal cells
-direct voluntary movements of body via control of somatic motor neurons in brain stem/spinal cord.
- corticospinal pathyway
- pyramidal system; pathway that provides voluntary motor control.
- postcentral gyrus
- primary sensory cortex of cerebral cortex.
-recieve somatic sensory info from the 5 sense receptors; provides continuous awareness of these senses. (collaterals deliver info for to basal nuclei, etc.)
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