WebThe expanded ectotympanic of the brown rat is tightly coupled to the petrosal, with five points of contact around the circumference of the ectotympanic abutting surfaces on the pars cochlearis and pars canalicularis and fusing to the tympanohyal (Figs. 6B, 17); the anterior crus of the ectotympanic also has a point contact with the squamosal . WebApr 13, 2011 · The malleus and ectotympanic have long been understood to have been primitively part of the lower jaw, or mandible; the joint between the malleus and incus is …
Scaling of the Ectotympanic Tube and Tympanic Membrane …
WebEctotympanic bone morphology is a classic characteristic used to differentiate primates and identify fossil affinities, often depicted as either a ring or tube falling along strict phylogenetic lines. Though ectotympanic bone morphology has been frequently cited in academic literature, the way in which this bone lengthens within and across taxa ... WebJul 25, 2012 · The ectotympanic and its impression are probably preserved more completely in Yanoconodon; the outline of the element is similar to that of Liaoconodon. The dorsal crus of the ectotympanic and the prearticular element of the malleus in Yanoconodon was interpreted as being fused to each other and both are further … projection definition science technology
An Early Cretaceous eutherian and the placental–marsupial
Web* Ectotympanic ring Early Miocene - Hominoids & Cercopithecoids In the Miocene, we see the rise of Hominoids. Early on, there is a split between Cercopithecoids and Hominoids with the appearance on animals such as Proconsul (again a remarkable fossil) about 18 mya. This animal is classified as a Dryopithecin - one of the three sub-families of ... WebSep 15, 2024 · Ectotympanic bone morphology is commonly used as a large-scale phylogenetic indicator across primates. Less well-understood is the intraspecies variation … WebApr 1, 2016 · The ectotympanic tube is a C- or U- shaped tube that is fused to the petrosal part of the temporal bone. In catarrhine primates, the ectotympanic tube consists of a bony part between the tympanic membrane and the external auditory meatus and an external cartilaginous part. In ceboids and strepsirrhines the ectotympanic tube is almost … projection designer otto