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My findings and interpretations do not support previous suggestions that the thoracic artery has undergone a mediad migration, and that the various sites of attachment of that vessel may come to represent various levels of evolution.

If the jaw were at almost any angle but maximum depression, the greatest component of force would be mediad, pulling the rami together and not upward.

The mediad component would increase as the jaw approached full adduction.

The greater part of the adductor chambers lies mediad of the mandibles and thus of the Meckelian fossae; consequently the muscles that arise from the dermal roof pass downward and outward to their insertion on the mandibular rami.

Mediad: toward the median plane or middle.