Medial pterygoid plate

Bone: Medial pterygoid plate
Sphenoid bone. Anterior and inferior surfaces. (Medial pterygoid plate labeled at bottom left.)
Sphenoid bone. Upper and posterior surfaces. (Medial pterygoid lamina labeled at center right.)
Latin lamina medialis processus pterygoidei
Gray's subject #35 151

The medial pterygoid plate (or medial pterygoid lamina) of the sphenoid is narrower and longer than the lateral pterygoid plate; it curves lateralward at its lower extremity into a hook-like process, the pterygoid hamulus, around which the tendon of the Tensor veli palatini glides.

The lateral surface of this plate forms part of the pterygoid fossa, the medial surface constitutes the lateral boundary of the choana or posterior aperture of the corresponding nasal cavity.

Superiorly the medial plate is prolonged on to the under surface of the body as a thin lamina, named the vaginal process, which articulates in front with the sphenoidal process of the palatine and behind this with the ala of the vomer.

The angular prominence between the posterior margin of the vaginal process and the medial border of the scaphoid fossa is named the pterygoid tubercle, and immediately above this is the posterior opening of the pterygoid canal.

On the under surface of the vaginal process is a furrow, which is converted into a canal by the sphenoidal process of the palatine bone, for the transmission of the pharyngeal branch of the internal maxillary artery and the pharyngeal nerve from the sphenopalatine ganglion.

The pharyngeal aponeurosis is attached to the entire length of the posterior edge of the medial plate, and the Constrictor pharyngis superior takes origin from its lower third.

Projecting backward from near the middle of the posterior edge of this plate is an angular process, the processus tubarius, which supports the pharyngeal end of the auditory tube.

The anterior margin of the plate articulates with the posterior border of the vertical part of the palatine bone.

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External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.

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Look at other dictionaries:

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  • pterygoid plate — noun : pterygoid lamina * * * pterygoid plate, either of the two sections, the lateral section or the medial section, that make up a pterygoid process …   Useful english dictionary

  • pterygoid plate medial — lamina medialis processus pterygoidei …   Medical dictionary

  • Lateral pterygoid plate — Infobox Bone Name = Lateral pterygoid plate Latin = lamina lateralis processus pterygoidei GraySubject = 35 GrayPage = 151 Caption = Medial wall of left orbit. (Label pterygoid plate labeled at bottom right.) Caption2 = Sphenoid bone, anterior… …   Wikipedia

  • pterygoid canal — n an anteroposterior canal in the base of each medial pterygoid plate of the sphenoid bone that gives passage to the Vidian artery and the Vidian nerve called also Vidian canal * * * canalis pterygoideus …   Medical dictionary

  • pterygoid hamulus — n a hook shaped process forming the inferior extremity of each medial pterygoid plate of the sphenoid bone and providing a support around which the tendon of the tensor veli palatini moves …   Medical dictionary

  • Pterygoid fossa — Infobox Bone Name = Pterygoid fossa Latin = f. pterygoidea ossis sphenoidalis GraySubject = 35 GrayPage = 151 Caption = Sphenoid bone. Upper and posterior surfaces. (Pterygoid fossa labeled at left.) Caption2 = System = Precursor = MeshName =… …   Wikipedia

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