BPK 142 Lecture Notes - Lecture 7: Multiple Sclerosis, Premotor Cortex, Pyramidal Tracts

• School: Simon Fraser University
• Department: Biomedical Physio & Kines
• Course: BPK 142
• Professor: Jim Carter

Document Summary

Divisions of the nervous system: central nervous system brain and spinal cord. Spinal cord - long cylinder of nerve tissue which extends down from the brainstem to the second lumbar vertebrae. 45 cm long and 2 cm in diameter. Consists of 12 pairs of cranial nerves coming from the brain and 31 pairs of spinal nerves every. 2 vertebrates we have two spinal nerves coming out one left one right system (cns) it is very protected. Always working against each other, where the sympathetic is always acceleration, and parasympathetic speeds everything down. Neruoglia non excitable, physical and biochemical support for neurons. Neuroglia comprise about 90% of the cells within the cns. They occupy about half of the volume of the brain. The four major types of glial cells serve as the connective tissue of the. Cns and as such help support the neurons both physically and metabolically.