PHGY 209 Lecture Notes - Cerebrospinal Fluid, Choroid Plexus, Dorsal Root Ganglion
Document Summary
3 mm of neurons make up this cerebral cortex and grow specimens on the outside. White matter: composed of trillions of myelinated axons connecting different areas. Basal nuclei (ganglia): one of the areas embedded inside the cerebral hemispheres. Thalamus: relay station, also siting inside the white matter. Limbic system: contains all areas mentioned above and other ones embedded inside and involved in memory and emotions. Ventricles: openings inside our brain that contain cerebral spinal fluid. Divisions of the spinal cord (a part of the cns): Signals can go up and down the spinal cord. We will later talk about the circuitry of the spinal cord. Each spinal segment corresponds to spinal nerves coming out on either side. Spinal nerves carry motor signals and somatosensory information. Thoracic nerves (next 12 pairs): shoulders, chest, upper abdominal wall. Lumbar nerves (next 5 pairs): located in the lower abdominal wall, hips, and legs. Spinal nerves start running down before they exit.
