PSL300H1 Lecture Notes - Lecture 29: Patellar Ligament, Golgi Tendon Organ, Stretch Reflex
Document Summary
Ventral side: efferent projections (causes the movements: simple reflexes, central pattern generators, complex volitional movements. 2 pathways: monosynaptic (sensory motor, polysynaptic (sensory interneuron motor) Performs only 1 specific task (1 cause 1 effect: stretch, golgi tendon, flexion withdrawal, patellar tendon, cross extension, extensor thrust, vestibulo-spinal. Stimulus: passive stretch (ie not triggered by the brain) of muscle: through applied load. Projection endpoints: muscle (motor neuron), brain (transcortical path) Latency: amount of time for a specific joint/limb to respond to this reflex: 25 ms in forearm, 27 ms in ankles (further away, possibly less innervated. Essential for posture stabilization: reflex is strongest in postural muscles. Response: relaxation / reduction in tension of the muscle. Golgi tendon organ (gto) afferents [i afferents] i interneurons (in intermediate zone) --| -motor neurons of the same muscle. Suppressed, when net motion is desired (?) Overactivation of biceps: gtr activation reduce muscle activation, stretch of triceps sr contraction of triceps.
