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Lecture 23 - Nervous System.docx

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Biology (Sci)
BIOL 111
Suzanne Gray

Mammals II: Nervous System 1. Central Nervous System (CNS)  Dorsal  Hollow tube of nervous tissue  Large cephalic ganglion (brain)  Long tube inferior to it (spinal cord)  Both brain and spinal cord protected by bone 2. Peripheral Nervous System (PNS)  System of lateral nerves  Cranial nerves from the brain  Spinal nerves from the spinal cord Fore brain: telencephalon and diencephalon give rise to the forebrain  Telencephalon: gives rise to cerebrum and limbic system o Cerebrum: enlarged in mammals  Centre for intellect, learning, memory, language and consciousness  Divided into 2 hemispheres (connected by corpus callosum)  Top layer = cerebral cortex, rich in cell bodies  Grooves and ridges increase surface area o Limbic System: include amygdala, hippocampus and nucleus accumbens  Responsible for basic physiological drives like hunger, thirst, emotions, long-term memory  “Pleasure and pain centers” located here Mammals II: Nervous System  Diencephalon: gives rise to thalamus and hypothalamus (interior part of forebrain) o Hypothalamus:
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