BLG 601 Lecture Notes - Lecture 4: Neuromuscular Junction, Somatic Nervous System, Peripheral Nervous System

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Functions: maintaining homeostasis: regulate and coordinate physiology, receiving sensory input. Monitor internal and external stimuli: controlling muscles and glands, establishing and maintaining mental activity. Brain and spinal cord process sensory input and initiate responses. Ending or our neurons or separate, specialized cells that detect things like temperature, pain, touch, pressure, light, sound, and odors: nerve. Bundle of axons and their sheaths that connects cns to sensory receptors, muscles, and glands. Cranial nerves originate from the brain; 12 pairs. Spinal nerves originate from spinal cord; 31 pairs. Extensive network of axons, and sometimes neuron cell bodies, located outside cns. Transmits action potentials from receptors to cns: motor (efferent) Transmits action potentials from cns to effectors (muscles, glands) Somatic nervous system (sns): from cns to skeletal muscles: voluntary. Synapse: junction of a nerve cell with another cell. E. g. neuromuscular junction is a synapse between a neuron and skeletal muscle cell.

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