Obstetrical Dilemma

Obstetrical Dilemma - ANTH-20105 Prof. McKenna 3/10/11 In...

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ANTH-20105 Prof. McKenna 3/10/11 In order to be where we are today, the human-species has needed to adapt and evolve just to be able to keep up with rapid changes of environment. One of the most groundbreaking changes came when humans got off of “all fours” and became a bipedal being. The evolution of becoming a bipedal being, in hindsight is one of the greatest achievements, but at the time it was detrimental and required rapid changing throughout the structure of our bodies. In order for us to stand upright without putting added stress to the neck and back, the brain needed to move back in the skull, the spine needed to bend ninety degrees leading up to the jaw line. Also, the upper part of the pelvic bone shifted forward and became wider while the lower and back part of the pelvic bone narrowed, shrinking the pelvic canal. This is known as the obstetrical dilemma. At this time of rapid changes, another change in human formation was undergoing. Humans were in the process of developing larger skulls. Because of the
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This note was uploaded on 01/05/2012 for the course ANTH 10105 taught by Professor Mckenna during the Winter '11 term at Notre Dame.

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Obstetrical Dilemma - ANTH-20105 Prof. McKenna 3/10/11 In...

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