Spinal control of movement Flashcards
What are the functions of a motor control system
Posture and balance, goal directed movements, and communication
What are the different classes of movement
Voluntary (complex, goal driven and learned), reflexes, and rhtyhmic motor patterns (chewing, walking, running)
What do lamina 1-6 do
terminations for primary afferent sensory neurons and neurons of reflex circuits
What dies lamina z do
sensory input from joints and muscle
What makes up lamina 8 and 9
cell bodies of motor neurons. These are in the ventral horn
What are renshaw cells and what do they do
Interneurons that synapse with axons branching back.
They suppress weakly firing motor neurons and dampen strongly firing ones, producing economical movement
What is the myotatic reflex
Knee jerk
WHat happens in the knee jerk reflex
Tap of patellar tendon stretches quadriceps muscle, stimulates dynamic nuclewar bag receptors of muscle spindle, la afferents fibre stretching quadriceps muscle, inhibits flexors of knee
What is the CPG
Central pattern generator
What happens in the inverse myotatic/Golgi tendon reflex?
During maintained pisture, quadriceps fatigye, patellar tendon fore declines, inhibitory afferents to Quadriceps fire, relaxes, increasing force in patellar tendon
What do golgi tendon organs do
Detect changes in muscle tension
What do muscle spindles do?
Detect changes in length
What does afferent mean
Sensory input feeding to the brain
What does efferent mean
Motor from the brain
