Archive image from page 223 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 190 OSTEOLOGY. bone and the union of the latter with the maxilla. Just above this the opening of the pterygo-palatine canal, which leads from the pterygopalatine fossa to the under surface of the hard palate, is visible; whilst inferiorly a small portion of the lower part of the pterygoid fossa is cut through. Within the choanse the middle and inferior concha? . are seen; the inferior border of the former corresponds to the level of the superior border
Archive image from page 223 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 190 OSTEOLOGY. bone and the union of the latter with the maxilla. Just above this the opening of the pterygo-palatine canal, which leads from the pterygopalatine fossa to the under surface of the hard palate, is visible; whilst inferiorly a small portion of the lower part of the pterygoid fossa is cut through. Within the choanse the middle and inferior concha? . are seen; the inferior border of the former corresponds to the level of the superior border of the zygomatic arch, whilst the attached edge of the latter to the perpendicular part of the palate lies in the same horizontal plane as the inferior margins of that arch. Note also that the medial pterygoid lamina? lie considerably within the lines of the medial sur- faces of the alveolar border, and reach some little distance below the level of the hard palate. The next section (Fig. 178) passes through the mandibular fossa just behind the tuberculum articu- lare ; superiorly, it cuts the vault half an inch behind the bregma. The middle cranial fossa is shown in section, the floor of which descends as low as the level of the inferior surface of the body of the sphenoid, corresponding laterally to a hori- zontal plane passing through the superior edge of the posterior root of the zygoma. The body of the sphenoid rises a finger's breadth above this in the median plane ; the cavity within it is exposed, whilst on either side and below is seen the groove for the internal carotid artery, leading upwrards from the medial part of the foramen lacerum, which is here divided. To the lateral side of the groove is seen the prominent edge of the lingula, immediately below which is the posterior aperture of the pterygoid canal, the inferior edge of which is in part concealed by the pterygoid tubercle. Immediately lateral to the foramen lacerum the foramen ovale is seen separated from th
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