HSCI 100 Lecture Notes - Lecture 18: Libido, Interneuron, Grey Matter
2 Dec 2016
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Document Summary
Spinal cord: message transmission and reflex center. Protected by stacked vertebrae of the of the vertebral column. White matter toward surface; gray matter in center. Conducts messages between the brain and the body. Spinal nerve conduct sensory and motor information between the central nervous system and a specific region of the body. Pairs of the spinal nerves leave through openings between the vertebrae. The white matter transmits messages to and from the brain, the gray matter functions as a reflex center. A reflex is an automatic response to a stimulus in a pre wired circuit called reflex arc. Spinal reflexes are decisions made by the spinal cord when speedy reaction is safer. Sensory messages are carried to the spinal cord by a sensory neuron. Interneurons in the spinal cord integrate info from sensory neurons and stimulate the appropriate motor neurons. Leg muscle contract causing then to lift foot off the glass. Allows for communication between cells through sensory input.
