Fig. 6 INSIDE VIEW OF THE CRANIAL CAVITY, ORBIT, MAXILLARY SINUS AND OTHER DEEP STRUCTURES OF THE HEAD
The upper part of the figure shown the anterior (135) and the middle cranial fossa (136) after thebrain has been removed. They are lined with the dura-periosteum. Underneath this are branches of the middle meningeal artery (29). The orbital cavity is still filled with its contents (52). The maxillary sinus (18) is largest here. In the oral cavity the alveolar processes of the two jaws are seen. The external auditory meatus (2) is cut almost length-wise. The thin nerve winding through the temporal bone is the chorda tympani (35). It contains secretory fibers for the salivary glands and taste fibers for the anterior two-thirds of the tongue. The mandibular nerve (32) is seen just as it leaves the cranialcavity through the oval foramen in the base of the skull. One of its motor branches divides to supply the medial pterygoid muscle (24), the tensor muscleof the soft palate (55, Fig. 7) and the tiny tensor tympani muscle (89, Figs. 8, 9).