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Study_Guide_for_Anatomy_Final

Study_Guide_for_Anatomy_Final - Study Guide for Anatomy...

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Study Guide for Anatomy Functions CNS - consists of the brain and spinal cord which occupy the dorsal body cavity. It is the integrating and command center of the nervous system. It interprets sensory input and dictates motor responses based on reflexes, current conditions and past experiences. PNS - part of the nervous system outside the CNS. Consists mainly of the nerves (bundles of axons) that extend from the brain and spinal cord. Spinal nerves carry impulses to and from the spine and cranial nerves carry info to and from the brain. Communication lines Branches- o Sensory- afferent division- consists of nerve fibers that take impulses to the CNS from sensory receptors located in the body. Sensory fibers taking impulses from the skin, skeletal muscles, and joints are called somatic afferent fibers Visceral afferent fibers takes impulses from visceral organ o Motor- efferent division- transmits impulses from the CNS to the effector or organs, which are muscles and glands Somatic nervous system- composed of somatic motor nerve fibers that conduct impulses from CNS to skeletal muscles. Voluntary nervous system Autonomic nervous system- ANS - consists of visceral motor nerve fibers that regulate the activity of smooth muscles, cardiac muscles, and glands. Involuntary nervous system Sympathetic division-fight and flight, excitatory, up regulates noepinephrine, not only direct and indirect stimulation (G proteins) Parasympathetic division- keep balance, down regulates, rest-recover- relaxation, inhibitory Neurons all characteristics, different parts of neuron cell and function-
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