BCS 110 Lecture 5: Organization of the Nervous System 2.1.18
9 Feb 2018
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Document Summary
2/1/18: main divisions of the nervous system - a system of twos, cns in bone, pns. Somatic ns - external environment: afferent nerves - sensory input from five senses, efferent nerves - motor output. Lateral ventricles (1 and 2) - on the sides of the third ventricle (horn-like) Fourth ventricle - behind the third: cerebral aqueduct, central canal, cns: blood flow, ask davis for more, the brain is a finely tuned electrochemical organ with substantial nutritional requirements. Blood is supplied from three main arteries: the anterior, middle and posterior cerebral arteries: feed the circle of willis ensures maximum blood flow to brain. Anterior - feeds the front (more of the inside: middle - feeds the lateral edges - stroke is a result of loss here. "foreign substances" proteins/other large molecules highly charged molecules hormones and neurotransmitters: glucose is actively transported, as are amino acids. Posterior = caudal: extremities, closer to the body, proximal.
