The Nervous System Chapter 14 – Nervous Tissue- video -I.Organization of Nervous system -Nervous system can be divided structurally or functionally -structural division between central and peripheral nervous systems -functional division between sensory and motor nervous systems I.A. Structural Organizational of the NS -structurally, nervous system has 2 subdivisions 1. Central nervous system (CNS): Includes brain and spinal cord 2. Peripheral nervous system (PNS): Includes cranial nerves, spinal nerves, ganglia. I.B. Functional Organization of NS -nervous system performs 3 general functions 1. Collect info: receptors in PNS detect changes in environment; pass info on to CNS 2. Process and evaluate info: CNS determines required response 3. initiate response: CNS initiates impulses that PNS carries to effectors (Muscles or glands) to react to changes in environment B.1. Sensory Nervous System -AKA afferent nervous system -receives sensory info (input) from receptors in PNS and transmits it to CNS -subdivided into 2 components: -somatic sensory (conscious): General senses such as touch, pain, pressure, vibration, and proprioception -visceral sensory (generally not conscious of them): impulses from blood vessels and viscera B.2 Motor Nervous System -AKA the efferent nervous system -sends impulses (output) from CNS through PNS to muscles and glands -tip: “E” for “exit” CNS to... -Subdivided into 2 systems -somatic (means body) motor (voluntary): conducts impulses that cause contraction of skeletal muscles -voluntary: have conscious control over -autonomic motor (involuntary): conducts impulses that regulate smooth and cardiac muscle as well as glands