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Kin 3304 Test 1 Part 3.docx

Kin 3304 Test 1 Part 3.docx - Nervous system CNS and PNS...

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Nervous system CNS and PNS PNS Ganglia: group of nerve cell bodies and dendrites Plexus: branching network of intersecting nerves PNS is divided into Autonomic nervous system (controls organs/involuntary actions) Regulates involuntary actions Sensory components monitor the levels of carbon dioxide, oxygen and sugar in the blood, arterial pressure and chemicals in the GI tract ANS is divided into Sympathetic Arises from thoracic and lumbar spinal nerves Parasympathetic Arises from cranial nerves and sacral spinal nerves Both sympathetic and parasympathetic have opposite effects on target tissue. Somatic nervous system (govern voluntary actions) Communicates with voluntary muscles and sense organs Neuron Dendrites receive and convey information toward cell body Axons convey information away from the cell body Spinal cord begins at the medulla oblongata of the brain, exits the skull at the foramen magnum and ends at the lumbar region of vertebrae. Meninges: Fibrous connective tissues that cover the brain and spinal cord Dura mater: Most superficial, tough and fibrous Arachnoid: More delicate than dura mater Pia mater: Vascular layer of loose fibrous connective tissue (adheres to brain/spinal cord) Epidural space and subdural space. Subarachnoid space separates arachnoid from pia mater Contains cerebrospinal fluid which is a protein-free filtrate blood plasma and its
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