CMD 377 Lecture Notes - Lecture 22: Inferior Parietal Lobule, Superior Parietal Lobule, Inferior Frontal Gyrus
Document Summary
Neocortex: gray matter of the majority of the cerebral hemisphere, 95% of the total cortical area of human. Paleocortex: some restricted parts of the base of the telencephalon (olfactory areas) Stellate cells: small, multipolar neurons, principal interneurons of the neocortex. Pyramidal cells: principal output neurons, apical dendrites ascend to the cortical surface, dendritic spines on the apical dendrites preferential site of synaptic contact. Fibers to/from other cortical sites: within same hemisphere association fibers, in contralateral hemisphere commissural fibers. Fibers to/from subcortical sites projection fibers: most descend through internal capsule. Corpus callosum: the largest fiber bundle, interconnect two cerebral hemisphere, anterior portion = genu, middle = body, posterior = splenium. Anterior commissure: interconnects parts of the temporal lobes especially middle and inferior temporal gyri. Posterior commissure: in the midbrain, connecting pretectal areas. Superior longitudinal fasciculus (arcuate fasciculus: connects the frontal lobe to the parietal, occipital, and temporal lobes. Superior occipitofrontal fasciculus: connects the occipital and front lobe, parallel to corpus callosum.
