BIOL 212 Lecture Notes - Lecture 21: Peripheral Nervous System, Spinal Nerve, Cranial Nerves

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Nervous system consists of all nervous tissue and includes: Central nervous system (cns) brain & spinal cord. Peripheral nervous system (pns) tissue outside cns. Includes cranial nerves, spinal nerves, receptors, and ganglia. Peripheral nervous system (pns): afferent (sensory) division: impulses sent towards cns = somatic & visceral, efferent (motor) division: impulses sent away from cns, further divided into somatic and autonomic, autonomic: parasympathetic and sympathetic. Somatic motor: connect with skeletal muscle only, skeletal muscle contractions, voluntary! Visceral motor (autonomic: connect with cardiac + smooth muscle, glands, and fat, stimulate or inhibit, autonomic (involuntary, sub-divisions: parasympathetic & sympathetic (fight or flight) Nervous tissue: conducts, or supports, conduction of impulses, sensitive to environmental changes, consists of two main cells, neurons, neuroglia, star-like appearance. Neuroglia of cns: astrocytes: form blood-brain barrier, structural support, microglia: remove pathogens, debris, waste; structural support, ependymal cells: lines ventricles; forms & circulates csf, oligodendrocytes: myelinate axons in central nervous system.

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