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BONES. 91

The Horizontal or Palate Process.—This corresponds to the palate
process of the superior maxilla. It is thin, quadrilateral in form, and
•jDresents for examination two surfaces and four borders.
The Superior Surface is smooth, concave from side to side, and forms
the posterior portion of the floor of the nasal chamber.
The Inferior Surface is smooth, excepting at its posterior portion,
where it is marked by a transverse ridge for the attachment of the
tensor palati muscle. This surface forms the posterior portion of the
hard palate.
The Posterior Palatine (or Palato-maxillari/) Canal is a groove,
sometimes a canal, situated at the outer portion of the ridge, for the
attachment of the tensor palati muscle. It is converted into a canal
bv articulation with the superior maxilla. It transmits the posterior
palatine vessel and anterior palatine nerves.
The Accessory Posterior Palatine Canal, or Canals, are between this
ridge and the pyramidal process.
The Anterior Border is serrated for articulation with the palatal pro-
cess of the superior maxilla.
The Posterior Border is free, smooth and concave, forming the pos-
terior boundary of the hard palate and floor of the nasal chamber.
Fig. 39.
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