A system of human anatomy, general and special . and irregular. Developement—-By a single centre for each bone, the first ossificdeposition making its appearance at the same time as in the —With four bones; frontal, ethmoidal, nasal, andsuperior maxillary. Attachment of Muscles.—It has in relation with it the pyramidalisnasi, and compressor nasi; but neither of these muscles is insertedinto it. * Mr. Wilson has entirely omitted the description of the pyramids of Wistar whichin their early stage project as thin triangular lamina; from the posterior borders of thelateral
A system of human anatomy, general and special . and irregular. Developement—-By a single centre for each bone, the first ossificdeposition making its appearance at the same time as in the —With four bones; frontal, ethmoidal, nasal, andsuperior maxillary. Attachment of Muscles.—It has in relation with it the pyramidalisnasi, and compressor nasi; but neither of these muscles is insertedinto it. * Mr. Wilson has entirely omitted the description of the pyramids of Wistar whichin their early stage project as thin triangular lamina; from the posterior borders of thelateral masses. As they become developed, the edges of the laminse fold over <=o as to forman imperfect triangular-pyramid, encroaching upon the body of the sphenoid bone on itsunder surface, and finally coalescing with it so as to perfect the sphenoidal cells Theremains of these pyramids may be seen on the adult bone, and arecalled by Wilson thesphenoidal spongy bones. They were first studied by Professor Wistar and are calledafter him.— SUPERIOR MAXILLARY BONES. 79 Superior Maxillary Bones.—The superior maxillary are the largestbones of the face, with the exception of the lower jaw ; they form, bytheir union, the whole of the upper jaw, and assist in the constructionof the nose, the orbit, the cheek, and the palate. Each bone is divi-sible into a body and four processes. The body is triangular in form, and hollowedin its interior into a large cavity, the antrummaxillare (the antrum of Highmore). It pre-sents for examination four surfaces, externalor facial, internal or nasal, posterior or zygo-matic, and superior or orbital. The external, or facial surface, forms theanterior part of the bone ; it is irregularlyconcave, and presents a deep depression to-wards its centre, the canine fossa, which givesattachment to two muscles, the compressornasi and levator anguli oi~is. Immediatelyabove this fossa is the infra-orbital foramen,the termination of the infra-orbital canal,
Size: 1255px × 1991px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
