The Development of the Head-muscles in Gallus domesticus, and the Morphology of the Head-muscles in the Sauropsida

A Few papers have been published on the early stages of development of the head-muscles of Gallus and other birds, and on the insertion of the mandibular muscles into Meckel’s cartilage and the lower* jaw; but as yet there has been no description of the formation of all the muscles in any one bird which might serve as a basis for a discussion of their morphology. The following is a contribution to the subject founded on an investigation of Gallus.