How is the arm held clear of the widest dimension of the thoracic cage?
What organs are protected, at least in part, by the pelvic girdle?
What is the difference between the true pelvis and the false pelvis?
Deduce why the pelvis bones of a four-legged animal such as a cat or pig are less massive than those of the human.
The pelvic bones of a two-legged animal such as a human have to carry his whole weight, divided by two. A four-legged animal such as a pig divides its weight over four legs, so each leg and each pelvic bone has to bear only a fourth of the animal's weight. As the strain on the bones is a half than in the two-legged case, the bones can be less massive.
A person instinctively curls over his abdominal area in times of danger. Why?
For what anatomical reason do many women appear to be slightly knock-kneed?
How might this anatomical arrangement contribute to knee injuries in female athletes?
gluteal tuberosity, greater and lesser trochanters