PSL300H1 Lecture Notes - Lecture 27: Patellar Ligament, Central Pattern Generator, Golgi Tendon Organ
Document Summary
Cns = brain: white matter (inside) + gray matter (outside) spine: white (outside) + gray (inside cord, butterfly, nuclei) Pns = white & gray matter through body. Spinal cord dorsal horn: sensory neurons = afferents intermediate zone: between horns ventral zone: motor neurons = efferents central canal: middle of cord. Simple reflexes: many innate, genetic e. g. baby grasp can lose reflexes with age. Reflex = bending back of sensory stimulus cns motor neurons. Reflexes (1) stretch (2) golgi tendon (3) flexion withdrawal (4) patellar tendon (5) cross extension (6) extensor thrust (7) vestibulo-spinal (8) vestibulo-occular. Reciprocal inhibition activation of motor nucleus + inhibition of antagonistic motor nucleus e. g. activate flexor, inhibit antagonistic extensor. Off for joint stiffness, turn another set on for co-contract e. g. to catch ball subconscious, fastest afferents (1a), sensitive. You stretch, it contracts : monosynaptic loop strongest in postural muscles suppressed during movement.
