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PSYCH 2NF3 (55)


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McMaster University
Bridget O' Shaughnessy

Chapter 7 The Structure of the Nervous System Gross Organization of the Mammalian Nervous SystemNS of all mammals has two division the CNS and the PNS Anatomical References o Read Page 169 and 170The Central Nervous System o Consists of the parts of the nervous system encased in bone the brain and the spinal cord o Three parts of the brain are common to all mammals the cerebrum the cerebellum and the brain stemo The CerebrumRostralmost and largest part of the brainIt is split down the middle into two hemispheres separated by the deep sagittal fissureThe right hemisphere receives information and controls the left side of the body the left hemisphere receives information and controls the right side of the body o The CerebellumLies behind the cerebrumIt contains as many neurons as both cerebral hemispheres combinedIt is primarily a movement control center with extensive connections to the cerebrum and spinal cordLeft side of the cerebrum is concerned with the left side of the body and the same applies to the right portion o The Brain StemThe remaining part of the brainForms the stalk from which the cerebral hemispheres and the cerebellum sproutA complex nexus of fibers and cells that in part serves to relay information from the cerebrum to the spinal cord and cerebellum and vice versaAlso the site where vital functions are regulated eg breathing consciousness and the control of body tempConsidered the most primitive part of the mammalian brain but also the most important to life o The Spinal CordEncased in a bony vertebral column and is attached to the brain stemIs the major conduit of info from skin joints and muscles of the body to the brain and vice versaIt communicates with the body via the spinal nerves part of PNSEach spinal nerve attaches to the spinal cord by means of two branches the dorsal root and the ventral rootThe Peripheral Nervous System o Has two parts the somatic PNS and the visceral PNS
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