KINESIOL 2Y03 Lecture Notes - Lecture 4: Central Canal, Tight Junction, White Matter

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Functions of the nervous system: receiving sensory input internal and external stimuli, integration interprets and remembers changes, initiates responses, mental activity consciousness, thinking, memory, emotion, controls of muscles and glands, homeostasis. Sensory receptors: ending of neurons or separate, specialized cells that detect such things as temp. , pain, etc . Nerve: a 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. Ganglion: collection of neuron cell bodies outside cns. Plexus: extensive network of axons, and sometimes neuron cell bodies, located outside cns. Sensory (afferent): transmits action potentials from receptors to cns. Motor (efferent): transmits action potentials from cns to effectors (muscles, glands) Somative nervous system: cns to skeletal muscles single neuron system. Synapse with skeletal muscle: junction of a nerve cell with another cell. I. e. neuromuscular junction is a synapse between a neuron and skeletal muscle cell.

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