Handbook of the Hospital Corps, United States Navy, 1939 / published by the Bureau of Medicine and Surgery under the authority of the Secretary of the Navy.

Date:
1939
Catalogue details

Licence: Public Domain Mark

Credit: Handbook of the Hospital Corps, United States Navy, 1939 / published by the Bureau of Medicine and Surgery under the authority of the Secretary of the Navy. Source: Wellcome Collection.

    28/1036 (page 18)
    The two maxille unite to form the upper jaw. In the body of each is a large air cell, the magillary sinus or antrum of Highmore. The lower border of the bone is the alveolar process and in this the upper teeth are embedded. Running horizontally inward from just above the alveolar process is a thin plate of bone that unites with its fellow of the opposite side to form all but the very posterior part of the hard palate. Above the hard palate the medial aspect of the bone forms the lateral wall of the nasal cavity. Each palate bone is L-shaped, the horizontal part forming the posterior por- tion of the hard palate and the vertical part forming the lower posterior portion of the lateral wall of the nasal cavity. The vomer is a thin flat bone that forms the lower posterior part of the nasal septum. The inferior turbinated bones are two small shell-like bones, lying along each lower lateral wall of the nasal cavity, forming a sort of curved shelf. The nasal bones are two small flat pieces of bone, one on each side of the root of the nose, that join in the mid- line to form the bridge of the nose. The lacrimal bones are two small bones that form a part of the wall of the orbital] cavity at its inner and lower angle, one on each side. The malar bones are the cheek bones and underlie the most prominent part of the cheek. The mandible is the horseshoe shaped bone of the lower jaw. The horizontal part of the bone is called the body, and the upper part of the body, which supports the teeth, is called the alveolar process. The vertical] part of the bone on each side is called the ramus. The juncture of the ramus and the body is called the angle of the jaw. Each ramus is topped by two processes—the condyloid process behind, for articulation with the temporal bone, and the coronoid process in front, for the insertion of the temporal muscle. The hyoid bone is a small U-shaped bone lying anteriorly in the neck and serving for the attachment of various muscles of the throat and tongue. THE BONES OF THE NECK AND TRUNK Vertebre. ((lue) ee ee 24 RO MPN ee pee ee he Pe 1 COCCY Xt MEA Sart Bt Se to ee 1 a, FF COGN US eee ie ee coe eee: er ° ; Ribs 2222. = 2 maser ge 4 Figure 9.—Spinal col- Z umn: a, Cervical; =: b, dorsal ; c¢, lumbar ; LOUIS, 22. eee ieee Renee ee ei oi d, sacrum ; e€, coccyx. (Mason. ) The spinal column consists of 24 movable or true verte- bree, the sacrum and the coccyx (fig. 9). Each of the latter two bones are made up of vertebral segments (false or fixed vertebre) that are fused in adult life. The true vertebre are irregular bones placed one on top of another with cartilage between, and named according to their location. There are 7 cervical, 12 thoracic or dorsal and 5 lumbar vertebre.