BLG 600 Study Guide - Midterm Guide: Grey Matter, White Matter, Neuroglia
Document Summary
Myelin is important for regeneration or degeneration. If cut axon and create site of injury, neuron has number of things that it can possibly undergo. If ends of site of injury are close, muscle hypertrophies (grows) If ends of sit of injury are far, shwann cells locally start to divide to form shwann cell tube and muscle remains atrophied. The cns and pns contain areas of gray matter and areas of white matter. Gray matter: area consisting of unmyelinated axons, cell bodies, dendrites, glia. Pns gray matter is groups of cell bodies called ganglia. White matter: area consisting of myelinated axons. Nerve tracts made of white matter propagate action potentials from one area in cns to another. In brain, gray matter is outer cortex and inner nuclei and white is deeper. In spinal cord, white matter is outer and gray is deeper (in butterfly clip) Cells produce electrical signals called action potentials.
