Horizontal plate of palatine bone

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Bone: Horizontal plate of palatine bone
Left palatine bone. Nasal aspect. Enlarged.
Left palatine bone. Posterior aspect. Enlarged.
Latin	pars horizontalis
Gray's	subject #41 167

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.

The medial border, the thickest, is serrated for articulation with its fellow of the opposite side; its superior edge is raised into a ridge, which, united with the ridge of the opposite bone, forms the nasal crest for articulation with the posterior part of the lower edge of the vomer.

Additional images

Base of skull. Inferior surface.

Roof, floor, and lateral wall of left nasal cavity.

Permanent teeth of upper dental arch, seen from below.

External links

Image:Gray187.png|Base of skull. Inferior surface.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e Bones of head and neck: the facial bones of the skull
Maxilla	Surfaces Anterior: fossae (Incisive fossa, Canine fossa) - Infraorbital foramen - Anterior nasal spine Infratemporal: Alveolar canals - Maxillary tuberosity Orbital: Infraorbital groove - Infraorbital canal Nasal: Pterygopalatine canal Processes Zygomatic process Frontal process (Agger nasi, Anterior lacrimal crest) Alveolar process Palatine process (Incisive foramen, Incisive canals, Foramina of Scarpa, Incisive bone, Anterior nasal spine) Other Body of maxilla - Maxillary sinus
Zygomatic	Orbital process (Zygomatico-orbital) - Temporal process (Zygomaticotemporal) - Lateral process (Zygomaticofacial)
Palatine	Fossae Pterygopalatine fossa - Pterygoid fossa Plates Horizontal plate (Posterior nasal spine) - Perpendicular plate (Pterygopalatine canal, Sphenopalatine foramen, Pyramidal process) Processes Orbital - Sphenoidal
Mandible	Body external surface (Symphysis menti, Mental protuberance, Mental foramen) - internal surface (Mental spine, Mylohyoid line, Sublingual fovea, Submandibular fovea) - Alveolar part of mandible Ramus Mylohyoid groove (Mandibular canal, Lingula) - Mandibular foramen - Angle Coronoid process - Mandibular notch - Condyloid process
Minor/ nose	Nasal bone: Internasal suture - Nasal foramina Inferior nasal concha: Ethmoidal process - Maxillary process Vomer: Wing Lacrimal: Posterior lacrimal crest - Lacrimal groove - Lacrimal hamulus

Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .