Pterygoid process
Processus pterygoideus
Definition
On each side of the body of the basisphenoid bone, the pterygoid process (Processus pterygoideus) comes off. It unites rostrally to the palatine bone and to the pterygoid bone.
The basis of this process is perforated by a longitudinal canal: the pterygoid canal (Canalis pterygoideus) -formerly called 'vidian canal'-, preceded caudally by a narrow furrow (Sulcus nervus canalis pterygoidei), softly carved on the body of the basisphenoid bone.
More laterally, the basis of the pterygoid process is crossed in the same longitudinal direction in Horses, Dogs and Rabbits, by a much broader canal: the alar canal (Canalis alaris), that gives way to the maxillary artery.
At its junction with the pterygoid bone abd the perpendicular plate of the palatine bone, the pterygoid process also contributes to form the pterygoid fossa.
the wing of the basisphanoid bone (Ala ossis basisphenoidalis) is located even more laterally, perforated at its basis and very close of its caudal margin by the foramen ovale and contributes to form the foramen lacerum.
The sulcus of the auditory tube is located medio-caudally to these orifices (Sulcus tubae auditivae).
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