Lecture+02_NS_S2

Lecture+02_NS_S2 - Outline I. Structure of vertebrate...

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Unformatted text preview: Outline I. Structure of vertebrate Nervous System (NS) II. Cellular components of NS III. Brain neuroanatomy I. Structure of the Vertebrate Nervous System Central nervous system (CNS) : brain & spinal cord Peripheral nervous system (PNS) : nerves outside the brain &spinal cord Somatic nervous system : conveys information from organs & tissues to brain & spinal cord, transmits CNS information to musculature Autonomic nervous system : Regulates activity of organs & tissues (e.g., heart, intestines, blood vessels) Sympathetic branch : arousal, fight or flight, emergency Parasympathetic branch : relax and digest, non-emergency NOTE: this dichotomy is more illustrative rather than practical- E.g., increased parasympathetic activity occurs in response to stress The human nervous system The Autonomic Nervous System Parasympathetic branch : Derives from cranial and sacral regions Sympathetic branch : Derives from thoracic and lumbar regions Sympathetic : prepares the body for arousal breathing, heart rate, digestive activity forms chain of ganglia just outside spinal cord short preganglionic axons & long postganglionic axons both release the...
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Lecture+02_NS_S2 - Outline I. Structure of vertebrate...

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