HTHSCI 1H06 Chapter Notes -Internal Jugular Vein, Hindbrain, Pia Mater
5 Oct 2013
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Document Summary
Two main networks: central nervous system, peripheral nervous system. Cns causes muscles to contract and glands to secrete. Nerves, ganglia, enteric plexuses, and sensory receptors. 12 pairs of cranial nerves emerge from brain. 31 pairs of spinal nerves emerge from spinal cord. Ganglia nervous tissue consisting primarily of neuron cell bodies outside of brain and spinal cord. Enteric plexuses networks of neurons located in walls of organs of gastrointestinal tract. Divided into somatic, autonomic, and enteric (intestines) nervous systems. From somatic receptors in head, body wall, and limbs and from receptors for vision, hearing, taste, and smell to cns. Motor neurons conduct impulses from cns to skeletal muscles only. Sensory neurons that convey information from autonomic sensory receptors, located in visceral organs such as stomach and lungs to cns. Motor neurons conduct nerve impulses from cns to smooth muscle, cardiac muscle, and glands. Motor part of ans consists of sympathetic and parasympathetic divisions.
