BIO 211 Lecture Notes - Lecture 25: Dorsal Root Ganglion, Tendon Reflex, Stretch Reflex
1 Dec 2020
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Document Summary
Dorsal or posterior root is incoming sensory fibres. system. Ventral or anterior root is outgoing motor fibers. Spinal reflex muscle contraction via muscle spindles, which respond to change in length. Dorsal root ganglion (swelling) = cell bodies of sensory nerves. Are rapid, automatic responses to specific stimuli. Preserve homeostasis by making rapid adjustments in functions of organs or organ. Stretch reflex operates as a feedback mechanism to control muscle length by causing a. Prevents injury from over stretching because muscle contracts when it is stretched. Tendon reflex operates as a feedback mechanism to control muscle tension by causing. Consist of a bundle of specialized muscle fibers (intrafusal muscle fibers). Are surrounded by larger skeletal muscle fibers responsible for muscle tone and. Sensory neuron surrounds muscle spindle and is always sending impulses to cns. Are innervated by gamma ( ) motor neurons that alter tension in spindle and control relaxation before muscle force becomes so great that tendons may be torn.
