. Fig. 164.—General arrangement of the sinuses. The circular openings indicate points at which trepanation is performed. region of the face, from the inferior extremity of the maxillary spine as far as the sub-orbito-palatine region. In front its external wall is very solid, but behind, below the orbit, is extremely thin. Ex- ternally the sinus is largely protected by the anterior insertion of the external masseter muscle, a fact which explains how rarely it is injured. Larynx, In consequence of its deep situation, the larynx can

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectveterin, bookyear1920