Muscles Two Types of Muscle receptors: Golgi Tendon Organs and Muscle Spindle ReceptorsGolgi Tendon Organs- Deals with contractionMuscle Spindle Receptors- Deals with stretch. Has two kinds:Primary- innervate (or supply with nerves) to the central region of the muscle spindle Secondary- innervate to the thin ends of the muscle spindles Muscle Activation: Stimulus that enters either through the dorsal or ventral root. Dorsal is sensory. Ventral is motor. Muscles receive input from motor neurons. The muscle releases acetylcholine (ACh). Spinal cord Cervical: Head and arms Thoracic: Back Lumbar: Legs and top of feet Sacral: Butt and bottom of feet Levels of motor controlSpinal cord- activate either Golgi tendon organ or muscle spindle receptor, synapse of neuron on spinal cord, activation of motor nerves for movement.Cerebellum- Balance, eye movement, muscle coordination, muscle toneCerebral cortex-Primary Motor Cortex- Encode force and directionSupplementary Motor Area- Planning movements Premotor Cortex- Planning and control of limbs Motor info crosses in the decussation of the pyramidal
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