The principles and practice of dentistry : including anatomy, physiology, pathology, therapeutics, dental surgery and mechanism / by Chapin A. Harris.

  • Harris, Chapin A. (Chapin Aaron), 1806-1860.
Date:
1906
Catalogue details

Licence: Public Domain Mark

Credit: The principles and practice of dentistry : including anatomy, physiology, pathology, therapeutics, dental surgery and mechanism / by Chapin A. Harris. Source: Wellcome Collection.

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    The Anterior Surface is almost vertical, and presents the following points : lamella in the median line, articulating with the perpendicular plate of the ethmoid bone, and forming part of the nasal septum; opening of the sphe?ioidal sinuses or cavities in the body of the bone— common to adults only; sphenoidal turbinated bones (the pyramids of Wistar), which partially close the sinuses, and articulate with the eth¬ moid and palate bones. The Inferior Surface assists in forming the nasal fossae, and presents the following points : rostrum, which articulates with a groove on the vomer ; vaginal processes, one on each side of the rostrum ; pterygo¬ palatine grooves, which in connection with the sphenoidal processes of the palate bones form the pterygo-palatine canals for the transmission of the pterygo-palatine arteries and nerves. Each of the greater wings of the sphenoid bone on its superior surface presents the following points: fo7'amen rotundum, for the superior maxillary division of the fifth pair of nerves ; foramen ovale, for the inferior maxillary division of the fifth pair of nerves, the small petrosal nerve, and the small men¬ ingeal artery; the fora??ien vesalii, for transmitting a small vein ; fora¬ men spinosum, for transmitting the middle meningeal artery. The Anterior Surface assists in forming the external wall of the orbit of the eye, the spheno-maxillary and sphenoidal fissures. It articulates with the frontal and malar bones, and contains a notch, for a branch of the ophthalmic artery ; a spine, for part of the lower head of the external rectus muscle ; the external o?'bital foramina, for arterial branches. The external surface presents the following points : pterygoid ridge, which divides the temporal fossa from the zygomatic ; the spine of the sphenoid, to which the internal lateral ligament of the lower jaw and the laxator tympani muscles are attached. The circumference is partly serrated for articulation with the temporal bone, and partly smooth for the anterior margin of the foramen lacerum medium and the inferior margin of the sphenoidal fissure, which margin it assists in forming. The lesser wings of the sphenoid bone (Processes of Ingrassias) termi¬ nate internally in the anterior clinoid processes. Their anterior bor¬ ders articulate with the orbital plate of the frontal bone, while the pos¬ terior are free, dividing the anterior cerebral fossa from the middle. Intimately connected with each of these wings are the optic foramen, for the transmission of the optic nerve and the ophthalmic artery ; also the sphenoidal fissure, or foramen lacerum anterius, which transmit the third, fourth, the ophthalmic division of the fifth and sixth pairs of nerves, the ophthalmic vein, branches of the lachrymal and middle meningeal arteries, some filaments of the sympathetic nerv^, and a process of the dura mater. The wing-like processes (pterygoid pro-