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30 October 2009
Pick up 1QQ from WednesdayPick up answer sheet for today’s 1QQToday’s Lecture: Ch. 10 Control of MovementDemo of SPSS for Statistical AnalysisMonday’s Test # 2: Approx numbers of MC questions:20 Sensory, 15 Muscle, 10 Hearing, 3 Equilibrium, 15 Visual, 8 Autonomic, 15 Synapses
Fig. 10.01
Reflex
“Volunteer motives”
Initiates motor command
Coordinates secondary movements
Balance and complex learned
movementsPathways?
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
Fig. 10.05ab
Fig. 10.05c
Fig. 10.06
Stretch reflex is monosynaptic
Most common example: patellar reflex = “knee jerk reflex”
Proprioception pathway via dorsal column-medial lemniscus pathway
Fig. 10.07
Golgi tendon organs involved in a reflex to
oppose excessive muscle tension.
Not monosynaptic.
Not shown: ascending axons in dorsal column-medial lemniscus tract.
Joint angle detectors and cutaneous mechanoreceptors contribute to sense of body position (proproiception.)
Fig. 10.01Initiates motor command
Fig. 10.12Pyramidal tract
Extra-Pyramidal tracts
Not monosynaptic!
Reticulospinal tractVestibulospinal tract
Corticospinal tractCorticobulbar tract
Fine motor control, esp. of extremeties
Originate in brainstem,more involved with posture and equilibrium
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