ANAT 101 Lecture Notes - Lecture 22: Lumbosacral Plexus, Vagus Nerve, Adrenal Medulla
7 Mar 2018
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Functional organization/ divisions: sensory and motor nervous system, somatic and autonomic nervous system (from motor ns, sympathetic and parasympathetic nervous system (from ans) Includes all the neural tissue outside the cns. Function: to connect cns to organs of the body and environment. Sends info about the internal and external environment to the cns. Composed of receptors and afferent (incoming) neurons. Receives info from receptor organs that can detect changes in environment. Sends commands from the cns to target tissue. Composed of efferent (outgoing) neurons and effectors (muscles and glands) Sends information to effector target tissue (that can carry out motor demands, like muscles and glands) Brain processes information and generates new command to be sent to body. Rapid, automatic, unlearned response to a stimulus. Response opposes stimulus (e. g. move away from pin that you"re stepping on) Has little variability (e. g. will always remove foot from pin, no dancing etc. ) m. Afferent neuron synapses directly onto an efferent neuron.
