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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