PSYCH 1000 Chapter Notes - Chapter 3.3-3.4: Donald O. Hebb, Somatic Nervous System, Autonomic Nervous System
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The peripheral nervous system includes the somatic and autonomic systems: the pns has two primary components: the somatic nervous system and the autonomic nervous system. Somatic nervous system (sns): transmits sensory and motor signals between the central nervous system and the skin, muscles, and joints. Autonomic nervous system (ans): transmits sensory and motor signals between the (cid:272)e(cid:374)tral (cid:374)er(cid:448)ous s(cid:455)ste(cid:373) a(cid:374)d the (cid:271)od(cid:455)"s glands and internal organs: sympathetic and parasympathetic divisions. Two types of signals, sympathetic and parasympathetic, travel from the central nervous system to organs and glands, controlling their activity. Sympathetic division: prepares the body for action. Parasympathetic division: returns the body to its resting state. Most internal organs are controlled by inputs from the sympathetic and parasympathetic systems. The (cid:373)ore aroused (cid:455)ou are, the greater the s(cid:455)(cid:373)patheti(cid:272) s(cid:455)ste(cid:373)"s do(cid:373)i(cid:374)a(cid:374)(cid:272)e. The endocrine system communicates through hormones: the endocrine system is a communication network that uses hormones to influence thoughts, behaviors, and actions.
