Input from spinal Sensory input interneurons from muscle spindles Input from upper motor neurons in the brain Alpha motor neuron
Overview -organization of motor systems Motor cortex Brain Stem Spinal cord a-motor neuron Final common pathway Skeletal muscle
Overview - organization of motor systems Motor Cortex Brain Stem Spinal Cord Skeletal muscle a-motor neuron Final common pathway
Final common path-a-motor neuron (+) muscle Transmitter? fibers Schwann cells motor nerve fiber axon hillock Receptors? acetylcholine esterase NM junction
Final common path - a-motor neuron (-) muscle fibers (+) (-) (+) axon hillock motor nerve fiber NM junction Schwann cells Receptors? acetylcholine esterase Transmitter?
Final common Pathway, o a motor pathway consisting of the motor neurons by which nerve impulses from many central sources pass to a muscle in the periphery
Final Common Pathway, ⚫ a motor pathway consisting of the motor neurons by which nerve impulses from many central sources pass to a muscle in the periphery
Section 2. Spinal Reflexes Somatic reflexes mediated by the spinal cord May occur without the involvement of higher brain centers Was facilitated or inhibited by bi rain ● For example Stretch reflex Deep tendon reflex Crossed extensor reflex Superficial reflex
Section 2. Spinal Reflexes ⚫ Somatic reflexes mediated by the spinal cord – May occur without the involvement of higher brain centers – Was facilitated or inhibited by brain ⚫ For example – Stretch reflex – Deep tendon reflex – Crossed extensor reflex – Superficial reflex