01:119:101 Lecture Notes - Lecture 25: Auditory Cortex, Olfactory Bulb, Brainstem
25 Feb 2016
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49. 2: cnidarians, simplest animals with nervous system, nerve net series of interconnected nerve cells, no central control organ. Transverse nerves connect 2 nerve cords: annelids and arthropods, brains more complex, ganglia segmentally arranged clusters of neurons c. Increasing complexity: nervous system organizations usually correlates with lifestyle, chiton slow-moving simple, squid active predator complex. 1: concentration/centralization of nerve cells, specialization of function. Increase complexity: cephalization concentrate nerve cells in front end. Glial cells: types, ependymal cells, line cavities of cns, cilia promote circulation of cerebra spinal fluid, astocytes a. In cns: dilate blood vessels near active neurons, regulate composition of cerebrospinal fluid. Rel. fixed response pattern to a simple stimulus. Sensory receptors detect sudden stretch in quadriceps muscle: brain, 3 main regions forebrain, midbrain and hindbrain, ventricles cavities, gray matter surrounds white matter, cerebrospinal fluid. Sensory receptors detect stimuli: nerves, cranial from hind part of the brain, spinal originate from spinal cord, 2 components, motor nervous system, external environment, components.
