01:830:331 Lecture Notes - Lecture 18: Dorsal Root Ganglion, Somatic Nervous System, Autonomic Nervous System
24 Jul 2016
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Document Summary
~pns has somatic nervous system and autonomic nervous system. Sns (somatic) spinal and cranial nerves, receives sensory info, controls skeletal muscles. Smooth muscle is in skin, digestive system, eyes, blood vessels. Ans is further split into sympathetic and parasympathetic anatomically separate systems. Most organs are innervated by both symp and parasymp, but they have different effects. ~spinal nerves come from vertebrae, travel to muscles and sensory receptors, branching on the way. ~spinal nerves innervating skeletal muscles often follow blood vessels. ~cell bodies for all axons bringing sensory info to cns are in pns (except for visual bc retina is in brain) Cell bodies of the afferent axons are in the dorsal root ganglia (bulged parts of dorsal roots) ~efferent means outgoing axons, carry information outwards to muscles and glands. Cell bodies of efferent axons are in the gray matter of spinal cord. Note the cell bodies do not come from ventral root, no bulged ganglia on ventral roots.
