All anapsid skulls lack a temporal opening while all other extant amniotes have temporal openings ( although in mammals, the hole has become the zygomatic arch ).
42.
Other distinguishing characteristics of gomphodonts include deep zygomatic arches, upper postcanines with three or more cusps spanning their widths and lower postcanines with two cusps spanning their widths.
43.
The zygomatic arches ( cheekbones ) are not broadened towards the sides, are connected to the maxillaries by broad bones, and contain clear crests on their upper sides.
44.
The lesser mouse-tailed bat has a short skull, with a loose tympanic bone and inflated lacrimal region and which is broadest at the squamosal region of the zygomatic arch.
45.
The zygomatic arches are wide, there is a transverse lambdoidal ridge at the rear of the cranium and in some species, a sagittal crest running from front to back.
46.
The skull has a highly developed zygomatic arch just behind the maxilla ( common to all mammals and their cynodont forebears ), and they have ossified external auditory bullae.
47.
After exposing, part of the zygomatic bone is trimmed away, or the front part of the zygomatic arch is moved inword by osteotomy of the zygoma and the zygomatic arch.
48.
It then crosses the posterior root of the zygomatic arch, enters the substance of the parotid gland, and unites with the internal maxillary vein to form the posterior facial vein.
49.
After exposing, part of the zygomatic bone is trimmed away, or the front part of the zygomatic arch is moved inword by osteotomy of the zygoma and the zygomatic arch.
50.
It passes medial to the zygomatic arch and forms a tendon which inserts onto the mandible, with its insertion extending into the retromolar fossa posterior to the most distal mandibular molar.
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