Archive image from page 1413 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 1380 SUKFACE AND SUEGICAL ANATOMY. Nasal septum Anterior cranial fossa i Inferior concha L. _ Crystalline lens of the eyeball Nasal cavity Buccal cavity Meckel's cartilage Fig. -Coronal Section through the Face of at the Seventh Week. Human Embryo not extend forwards into the hard palate. The cleft in the latter is spoken of as single or double according to whether the palatal processes have failed to unite with the lower edge of
Archive image from page 1413 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 1380 SUKFACE AND SUEGICAL ANATOMY. Nasal septum Anterior cranial fossa i Inferior concha L. _ Crystalline lens of the eyeball Nasal cavity Buccal cavity Meckel's cartilage Fig. -Coronal Section through the Face of at the Seventh Week. Human Embryo not extend forwards into the hard palate. The cleft in the latter is spoken of as single or double according to whether the palatal processes have failed to unite with the lower edge of the nasal septum on one, or on both, sides. When the cleft extends forwards through the alveolar process to become continuous with a cleft of the lip, the medial (premaxillary) edge of the cleft is usually projected for- wards in advance of the lateral (maxillary) edge. Before pro- ceeding to repair the cleft in the lip, the projecting premaxil- lary edge is forced back into line with the maxillary edge. In what is known as a complete double cleft palate, the pala- tine processes fail to join the nasal septum and the premaxillse on both sides; the result is a wide median cleft which communicates with both nasal cavities. The free inferior border of the vomer extends along the middle of the cleft to be continuous anteriorly with the rounded pre- maxillary mass; the latter, along with the central portion of the up- per lip, is projected forwards between the two labial clefts, often to such an extent that it appears to spring from the tip of the nose (Fig. 1081). In operating on such a double hare- lip the first step is to get rid of the premaxillary pro- jection. This is done, not by re- moving it alto- gether, but by removing a trian- gular portion of the septum of the nose behind it, so as to allow of its being bent back into line with the alveolar processes of the maxillse. The base of the triangular piece of bone should not be taken from the constricted portion of neck of th
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