GLOSSARY. 99 
Mandible (L. sando, | chew).—The lower jaw, the 
inferior maxilla of human anatomy. 
Manubrium (L. a handle).—Applied to the anterior 
portion of the sternum, also termed /pre- 
Slernum. 
Manus (L. the hand).—The hand. 
Marginal bones,—A name given to certain additional 
bones on the radial and ulnar borders of the 
manus in the /chthyosauria. 
Mastoid (Gr. zastos,a nipple ; ezdos, shape)—Applied 
to a process of the temporal bone behind 
the ear. 
Maxilla (L. a jaw).—The upper jaw, although some- 
times applied to both upper and lower jaws, 
which are then spoken of as inferior and 
superior maxille respectively. 
Maxillo-turbinal.—The inferior turbinated bone of 
the face. 
Meatus (L. a way, passage).—A small canal. 
Meatus auditorius externus (L. external auditory 
canal). — The passage leading from the 
exterior to the cavity of the tympanum. 
Meatus auditorius internus (L. internal auditory 
canal)—The opening in the posterior portion 
of the periotic, for the passage of the auditory 
nerve to the internal ear. 
Meckel’s cartilage.—The cartilage of the chondo- 
cranium forming the axis of the mandible. 
Medius (L. middle).—The third digit. 
Mental prominence (L. mentum, the chin).—A tri- 
