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Control of Movement: SPSS Analysis, Reflex Arcs, and Motor Commands

This lecture covers the intricate processes involved in controlling movement, emphasizing the role of reflex arcs in motor command initiation. Topics include sensory input, muscle control, proprioception, and the function of various neural pathways, including the spinal reflexes such as the patellar reflex. We explore the contributions of different types of neurons (afferent, alpha, gamma) and discuss the implications for balance and learned movements. Additionally, we incorporate statistical methods via SPSS for understanding these concepts and review clinical cases of motor disorders.

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Control of Movement: SPSS Analysis, Reflex Arcs, and Motor Commands

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  1. 30 October 2009 Pick up 1QQ from Wednesday Pick up answer sheet for today’s 1QQ Today’s Lecture: Ch. 10 Control of MovementDemo of SPSS for Statistical Analysis Monday’s Test # 2: Approx numbers of MC questions:20 Sensory, 15 Muscle, 10 Hearing, 3 Equilibrium, 15 Visual, 8 Autonomic, 15 Synapses

  2. “Volunteer motives” Fig. 10.01 Initiates motor command Coordinates secondary movements Balance and complex learned movements Pathways? Reflex

  3. Local control • Muscle spindle • Stretch receptor • Intrafusal muscle fiber • What is their role? • Lets look at a stretch reflex… • Follow the reflex arc • Be able to differentiate function of afferent fibers, alpha motor neurons, and gamma motor neurons

  4. Fig. 10.05ab

  5. Fig. 10.05c

  6. Fig. 10.06 Proprioception pathway via dorsal column-medial lemniscus pathway Stretch reflex is monosynaptic Most common example: patellar reflex = “knee jerk reflex”

  7. Fig. 10.07

  8. Not shown: ascending axons in dorsal column-medial lemniscus tract. Golgi tendon organs involved in a reflex to oppose excessive muscle tension.Not monosynaptic.

  9. Joint angle detectors and cutaneous mechanoreceptors contribute to sense of body position (proproiception.)

  10. Fig. 10.01 Initiates motor command

  11. Not monosynaptic! Fig. 10.12 Pyramidal tract Corticospinal tractCorticobulbar tract Fine motor control, esp. of extremeties Extra-Pyramidal tracts Reticulospinal tractVestibulospinal tract Originate in brainstem, more involved with posture and equilibrium

  12. Who Cares? Video of Huntington’s Chorea Video of Parkinsonsim Patient Video of Cerebellar Dysfunction Video of Locked-In Syndrome Video of Trampoline Championship

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