Medical Sciences 3999A/B/Y Lecture 19: (HSTL 1102 - Block-2)
16 Feb 2020
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Document Summary
Cns: structures - cerebrum, cerebellum and spinal cord. Pns: main components - nerves (bundles of nerve fibres surrounded by ct sheaths), ganglia and nerve endings. Stellate cells: very small cells with many branches - facilitates transmission faster. *alcohol"s effects in order: 1) forebrain - motor coordination and decision making, 2) midbrain - loss of emotional control, 3) brainstem - heart rate, body temperature, appetite and consciousness (can be fatal) Cerebrum (cortex): largest part of human brain, associated with higher brain function (i. e. thought and action) Primary function: integration of sensory information and initiation of voluntary motor responses. Frontal lobe - reasoning, planning, parts of speech, movement, emotions and problem solving. Parietal lobe - movement, orientation, recognition, perception of stimuli. Temporal lobe - perception and recognition of auditory stimuli, memory and speech. Cells of cajal - horizontal; parallel to cerebral surface. Large pyramidal cells (in a typical pyramid shape) Extremely large in motor areas (called betz cells)
