Treatment of Fracture of the Jaw (Paperback)

This historic book may have numerous typos or missing text. Not indexed. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1881. Not illustrated. Excerpt: ... i. Centre of the condyle upon which the head rocks. 2. Styloid process. 3. Condyle of lower jaw. 4. Neck of do. 5. Angle of do. 6. Eminentia articularis. 7. Curve upon which the jaw opens. A. External pterygoid. B. Upperhead of do. C. Lower head of do. D. Geniohyo-glossus. E. Genio-hyoid. F. Mylo-hyoid. G. Hyo-glossus. H. Middle constrictor. J. Inferior do. K. Thyro-byoid. L. Sterno-thyroid. M. Stylohyoid. N. Stylo-hyoid ligament. C. Stylo-maxillary ligament. P. Complexus. The chin is thrown up, and the jaw, and also the curved line which indicates the position of the condyles of the head, are drawn small to show the muscles more distinctly. For the same purpose the Platysma-myoides and Masseter muscles are left out, and the insertion of the Temporal and the origin of the Trapezius cut away. The sterno-cleido-mastoid muscle is said to be a rotator, a flexor, and an extensor of the head. What this flexing of the head means, in addition to lateral movement, may be learned by the following quotation: "The sterno-mastoid muscles, when both are brought into action, serve to depress the head upon the neck, and the neck upon the chest." These views are also maintained by J. Cruveilhier, f and may be accepted as those not only of the French anatomists and physiologists generally, but also of the German and English with few exceptions. Professor Henle, however, says positively that these muscles do not flex the head down in front, and that the muscles lift the head and bend the neck when the body is brought up in rising from the back. This is a great advance upon what is said by others, but beyond this he gives no intimation of understanding their peculiar and most important function. The insertion of the sterno-cleido-mastoid muscle is around the front of the masto...