NURSING Lecture Notes - Lecture 3: Central Nervous System, Autonomic Nervous System, Spinal Nerve

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Nervous system- consists of the brain, spinal cord, and nerves. Functions: to defect changes and feel sensations, to initiate appropriate responses to changes, to organize information for immediate use and store it for future use. Nerve tissue-consists of nerve cells/nerve fibers called neurons. Parts of nerve tissue: neuron (nerve cell, cell body b. axon c. dendrites, synapse, neuroglia, schwann cells, neurotransmitters. Types of neurons: sensory/afferent neurons, motor/efferent neurons, interneurons. Sensory/afferent neurons-carry from receptors to cns>> interprets these impulses as sensation impulses. Receptors-detect external and internal changes: somatic-from receptors in skin, skeletal muscles and joints, visceral-from receptors in internal organs. Motor/efferent neurons -carry impulses from cns to effectors: Muscle- contract in response to impulses linked to smooth muscle: somatic-receptors linked to skeletal muscles, visceral-receptors cardiac muscle, and glands. Concerned with thinking, learning and memory: sensory and motor neurons make up the pns, visceral motor neurons form the autonomic nervous system (a specialized sub-division of pns) taste, smell,

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