BIOL 313 Lecture Notes - Lecture 3: Choroid Plexus, Peripheral Nervous System, Autonomic Nervous System

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9 Sep 2016
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Lecture 5 and 6 anatomy, cns and pns. Central nervous system: blood-brain barrier and csf. Csf: generated in ventricles, specifically in the choroid plexus. Circulates through ventricles in central canal, percolates to outside of ns and circulates throughout brain, spinal cord, cerebellum, etc. in both outer and inner surfaces. Astrocytes help maintain ion concentrations in csf. Csf held in place around cns by membranes: gets reabsorbed into blood by membranes. Spinal taps take place toward bottom of spinal cord because the membrane expands slightly. The postganglionic axon then runs out to designated organ a. i. Synapse in the ganglion uses acetylcholine (ach) a. iii. Ach used by both preganglionic and postganglionic fibers b. v. constricts airways, slows heart rate, stimulates gut activity, increases blood to gut, constricts pupils, stimulates salivation. *** similar: many cell bodies live in cns, send out axon to ganglion (preganglionic fiber), synapse with a second neuron, which sends another axon to an organ or muscle (postganglionic fiber).

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