ANP 1106 Lecture Notes - Lecture 7: Peripheral Nervous System, Somatic Nervous System, Autonomic Nervous System
26 Apr 2016
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Document Summary
The nervous system is the master controlling and communicating system of the body. Its cells communicate via electrical and chemical signals, which are rapid and specific, and usually cause almost immediate responses. Sensory input: information gathered by sensory receptors about internal and external changes. Integration: processes and interprets sensory input and decides what should be done at each moment. Motor output: activates effector organs (muscles and glands) to produce a response. While the nervous system is one highly integrated unit, it is anatomically divided into two parts: central nervous system (cns): brain and spinal cord, integration and command centre. Spinal nerves: carry impulses to and from spinal cord. Cranial nerves: carry impulses to and from spinal cord. The peripheral nervous system"s two functional divisions include: sensory (afferent) division: convey impulses to the cns from receptors throughout the body. Somatic sensory fibres: convey impulses from skin, skeletal muscles and joints to cns.
