Why is the inferior region of the shoulder joint most vulnerable to dislocation?
The anterior, superior, and posterior surfaces of the shoulder joint are reinforced by ligaments, muscles, and tendons, but the inferior capsule is poorly reinforced. As a result, a dislocation caused by an impact or a violent muscle contraction is most likely to occur at this site. Such a dislocation can tear the inferior capsular wall and the glenoid labrum.
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The embryonic origin of the anterior pituitary gland is
A. glandular tissue from the cerebrum. B. epithelium from the oral cavity. C. an outpocket of the nasal cavity. D. nervous tissue from the area of the hypothalamus.
When an impulse arrives at the knob of the motor neuron, calcium
A. enters through active transport pumps and triggers the release of transmitter. B. enters through voltage-gated channels and triggers the release of transmitter. C. is released from synaptic vesicles. D. exits through voltage-gated channels and triggers transmitter release. E. exits through active transport pumps and brings transmitter with it.
From which germ layer does the nervous system form?
A. endoderm B. mesoderm C. exoderm D. ectoderm
Which term means closer to the point of attachment?
A. Proximal B. Dorsal C. Distal D. External