BLG 10A/B Lecture Notes - Lecture 11: Central Nervous System, Peripheral Nervous System, Spinal Nerve

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Chapter 11 nervous systems and nervous tissues. Integration processing and interpretation of sensory input: motor output activation of effector organs (muscles and glands) produces a response. Nervous system is divided into two principal parts: central nervous system (cns, brain and spinal cord of dorsal body cavity. Neuroglia: nervous tissue histology, nervous tissue consists of two principal cell types, neuroglia (glial cells): small cells that surround and wrap delicate neurons, neurons (nerve cells): excitable cells that transmit electrical signals. Line the central cavities of the brain and spinal column fluid bathing cns cells: oligodendrocytes, branched cells, processes wrap cns nerve fibers, forming insulating myelin sheaths in thicker nerve fibers. Neurons: neurons (nerve cells) are structural units of nervous system, special characteristics. Neuron processes: dendrites, receptive (input) region of neuron, convey incoming messages toward cell body as graded potentials (short distance signals)

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