Fig. 2 BACK VIEW OF THE SUPERFICIAL STRUCTURES OF THE FACE AND NECK SHOWN IN FIGURE 1
The plane by which this slab is separated from the rest of the head passes just inward to the auricle (1) and lower jaw-bone (38b) and through the infra-orbital foramen (36) anteriorly (compare Fig. 5). The auricle is cut off along the line of its attachment to the head, in this way exposing its cartilaginous skeleton (16). The tube-like external auditory meatus (2), through which the air vibrations normally reach the deeper parts of the auditory apparatus, is cut across, showing its cartilaginous support. The cut passes also through the mandibular joint (17),disclosing its two slit-like compartments separated by the cartilaginous articular disc. Since the lateral portion of the maxilla or upper jaw-bone was sawed off, the maxillary air sinus (18) or the large cavity which fills it, is opened. The spaciousness of this sinus and its topography, especially its communication with the nasal cavity, are demonstrated in the following illustrations.