Morphogenesis of the Shoulder Architecture. Part I. General Considerations

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Abstract
I. There is given a brief resume of embryonic conditions, and a consideration of applicable details of the nervous system. The probable original components of the branchial nerves are mentioned and the occipitospinal and spinal nerve plans outlined. The no. of the branchial nerves is highly variable in lower vertebrates, but probably is relatively constant after constriction of the fin base has once occurred. The brain becomes an increasingly important mechanism in the control of reflex action. Antigravity tone control of an efficient pattern was necessary for the evolution of the Mammalia. The relation of a muscle to its original motor nucleus is considered to remain forever constant. Muscles are basically divisible into branchial and somatic svstems. The original segmental muscle slips, and their nerves, passing to the limb bases first separated into anterior protractor and more posterior retractor series, these later dividing to form dorsal and ventral groups. Bone will develop wherever there is need for strengthening, particularly in myosepta and at the points of antagonistic muscular stresses.

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