_9_, Zygomatic arch; _11_, coronoid process; _12_, supraorbital
process; _13″_, paramastoid or styloid process; _13‴_, occipital
condyle; _14_, parietal bone; _15_, frontal bone; _16_, squamous
temporal bone; _17_, external auditory meatus; _18_, temporal
condyle; _19_, orbital surface of lacrimal bone; _20_, malar bone;
_21_, facial surface of lacrimal bone; _22_, nasal bone; _23_, nasal
process of premaxilla; _24′_, incisor teeth; _26_, maxilla; _27_,
facial tuberosity; infraorbital foramen in front of _27_; _28′_,
molar part of ramus of mandible; _30_, broad vertical part of ramus;
_30′_, angle of jaw; _31_, condyle of mandible; _32_, atlas; _x_,
wing of atlas. (After Ellenberger-Baum, Anat. für Künstler.)
]
The =ethmoid bone= has an extensive perpendicular plate. The lateral
mass consists of five endoturbinals and eighteen ectoturbinals (Paulli).
The largest ethmoturbinal is so extensive as to be termed a third or
middle turbinal bone; it projects forward between the upper and lower
turbinals. The lamina papyracea appears to a small extent externally in
the pterygo-palatine fossa, forming part of the upper margin of the
sphenopalatine foramen.
The =interparietals= are primitively paired, but unite before birth. As
already mentioned, fusion occurs before or shortly after birth with the
parietals and supraoccipital. No distinct tentorium osseum is present.
[Illustration: