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Palatine

Other Terms: Os palatinum, Os palatin, Hueso del palatine

Type

irregular

Description

It is wedged deeply into the posterior facial region where it contributes to the roof of the mouth, floor of the orbit, floor and lateral walls of the nasal cavity, and to the pterygopalatine fossa. It has a strong horizontal plate with a delicate vertical lamina projecting superiorly.

Etymology

The term is derived from the Latin term palatum designating the roof of the mouth. It is of doubtful origin, possibly related to the Latin words pabular or pascere meaning to feed.

Articulations

The palatine articulates with six bones: the opposite palatine, the sphenoid, the ethmoid, the maxilla, the inferior nasal concha, and the vomer. An extensive serrate articular surface unites the two palatines. Posteriorly, a similarly rough articular sulcus forms with the pterygoid process of the sphenoid bone. Joining the superior midline suture of the opposing palatines is the vomer contributing to a three-bone junction. The articular surfaces for the inferior nasal concha and ethmoid are smaller in comparison to the previous sutures.

Ossification

The palatine ossifies intramembranously from a single center that arises during the eighth embryonic week. It appears in the perpendicular plate near its junction with the horizontal plate. Ossification spreads vertically and horizontally. At birth the two plates are of equal length. As the facial anatomy matures and increases in vertical dimension, the perpendicular plate becomes about two times longer than the horizontal plate.

French

Os palatin

Latin

Os palatinum

Spanish

Hueso del palatine

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