Archive image from page 184 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE PALATE BONES. 151 The pars horizontalis (horizontal part) has two surfaces and four borders. As its name implies, it is horizontal in position, and forms the posterior third of the hard palate. Its superior surface, which is smooth, is slightly concave from side to side, and forms the floor of the posterior part of the nasal cavity. Its inferior surface, rougher, is directed towards the mouth, and, near its posterior edge, often displays a transver
Archive image from page 184 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE PALATE BONES. 151 The pars horizontalis (horizontal part) has two surfaces and four borders. As its name implies, it is horizontal in position, and forms the posterior third of the hard palate. Its superior surface, which is smooth, is slightly concave from side to side, and forms the floor of the posterior part of the nasal cavity. Its inferior surface, rougher, is directed towards the mouth, and, near its posterior edge, often displays a transverse ridge for the attachment of a part of the aponeurosfs of the tensor veli palatini muscle. The anterior border articulates by means of an irregular suture with the posterior edge of the palatine process of the maxilla. The posterior margin is free and concave from side to side; by its sharp edge it furnishes attachment to the aponeurosis of the soft palate. The medial border is upturned and when it articulates with its fellow of the opposite side it forms superiorly a central crest continuous in front with the nasal crest of the maxilla: it sup- ports the posterior part of the inferior border of the vomer, and projecting beyond the line of the posterior border forms the spina nasalis posterior (posterior nasal spine). The lateral border fuses with the vertical part, forming with it a riaht angle. The posterior extremity of this edge is grooved by the lower end of the foramen palatinum majus (greater palatine canal). Sphenoid Orbital process Ethmoid Orbital surface For maxilla Pterygo- palatine fossa Sphenoidal process g; Spheno-palatine notch For medial pteiygoid lamina Pterygoid f For lateral pterygoid lamina' Pyramidal - process Surface for attach. Surface Pterygopalatine sulcus of pterygoideus for maxilla internus Orbital process Orbital surface Ethmoid Sphenoid Crista ethmoidalis Spheno-palatine notch
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