Horizontal plate of palatine bone
The horizontal part of the palatine bone (horizontal plate) is quadrilateral, and has two surfaces and four borders.
Surfaces
The superior surface, concave from side to side, forms the back part of the floor of the nasal cavity.
The inferior surface, slightly concave and rough, forms, with the corresponding surface of the opposite bone, the posterior fourth of the hard palate. Near its posterior margin may be seen a more or less marked transverse ridge for the attachment of part of the aponeurosis of the Tensor veli palatini.
Borders
The anterior border is serrated, and articulates with the palatine process of the maxilla.
The posterior border is concave, free, and serves for the attachment of the soft palate. Its medial end is sharp and pointed, and, when united with that of the opposite bone, forms a projecting process, the posterior nasal spine for the attachment of the Musculus uvulæ.
The lateral border is united with the lower margin of the perpendicular part, and is grooved by the lower end of the pterygopalatine canal.
Podcasts:
