b. Light inhibits the secretion of melatonin. G. Cerebrum (Telencephalon) 1. Structure of the Cerebrum a. Longitudinal Fissure the two cerebral hemispheres –separates Falx Cerebrum of dura mater between the cerebral hemispheres. – Corpus Callosum bundle of axons that connects the cerebral hemispheres. – b. Transverse Fissure separates the occipital lobe from the cerebellum – Tentorium Cerebelli layer of dura matter between the cerebrum and – cerebellum. c. Gyri (Gyrus, sing.) convolutions or ridges of the cerebrum. – Precentral Gyrus primary motor cortex of cerebrum – Postcentral Gyrus somatosensory cortex of cerebrum – d. Sulci (Sulcus, sing) shallow grooves separating the gyri. – Central Sulcus separates the precentral and postcentral gyri – Lateral Sulcus separates the temporal lobe from the frontal/parietal – e. Gray Matter unmyelinated tissue in the central nervous system – Cerebral Cortex Thin outer layer of cerebrum. – Cerebral cortex contains 75% of neurons in the nervous system. Nucleus group of cell bodies within CNS – e. White Matter myelinated tissue in the central nervous system – 2. Basal Nuclei gray matter deep within the cerebrum – a. Nuclei Include: Caudate Nucleus Putamen Globus pallidus b. Basal Nuclei secrete which inhibits skeletal muscle contractions dopamine c. Portions of the basal nuclei extend into the midbrain as substantia nigra
b. Light inhibits the secretion of melatonin. G. Cerebrum (Telencephalon) 1. Structure of the Cerebrum a. Longitudinal Fissure –separates the two cerebral hemispheres Falx Cerebrum – of dura mater between the cerebral hemispheres. Corpus Callosum – bundle of axons that connects the cerebral hemispheres. b. Transverse Fissure – separates the occipital lobe from the cerebellum Tentorium Cerebelli – layer of dura matter between the cerebrum and cerebellum. c. Gyri (Gyrus, sing.) – convolutions or ridges of the cerebrum. Precentral Gyrus – primary motor cortex of cerebrum Postcentral Gyrus – somatosensory cortex of cerebrum d. Sulci (Sulcus, sing) – shallow grooves separating the gyri. Central Sulcus – separates the precentral and postcentral gyri Lateral Sulcus – separates the temporal lobe from the frontal/parietal e. Gray Matter – unmyelinated tissue in the central nervous system Cerebral Cortex – Thin outer layer of cerebrum. Cerebral cortex contains 75% of neurons in the nervous system. Nucleus – group of cell bodies within CNS e. White Matter – myelinated tissue in the central nervous system 2. Basal Nuclei – gray matter deep within the cerebrum a. Nuclei Include: Caudate Nucleus Putamen Globus pallidus b. Basal Nuclei secrete dopamine which inhibits skeletal muscle contractions c. Portions of the basal nuclei extend into the midbrain as substantia nigra
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