The primary motor cortex is located in which cerebral structure?
a. precentral gyrus
b. postcentral gyrus
c. motor speech area
d. prefrontal cortex
a. precentral gyrus
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When the elbow is extended and the elbow flexors contract, which of the component forces acts in addition to the rotary component?
A. the stabilizing component of muscle force B. the dislocating component of muscle force C. both A & B D. none of the above
As part of which nervous system do preganglionic neurons release acetylcholine?
a. parasympathetic nervous system b. sympathetic nervous system c. both the parasympathetic and sympathetic nervous systems
The pressure at which the pulse can first be heard corresponds to the ________ pressure.
A) peak systolic B) peak diastolic C) mean arterial D) average pulse E) capillary hydrostatic
If there is a stroke in the motor portion of the left side of the brain, it affects muscles of the right side of the body. Why?
A. The fibers in the motor tracts do not decussate. B. The fibers of the corticospinal tracts are ipsilateral. C. The fibers of the corticospinal tracts are contralateral. D. The fibers of the tectospinal tracts are contralateral. E. The fibers of the corticospinal tracts are unilateral.