mesonychids skull teeth, ear structure

These are themedial pterygoid plateandlateral pterygoid plate(pterygoid = wing-shaped). Name: Ambulocetus With a short lower spine stiffened by revolute joints, they would have run with stiff backs like modern ungulates rather than bounding or loping with flexible spines like modern Carnivorans. Privacy statement. Clarendon Press (Oxford), pp. Little did I know that the night before, Colima volcano in Mexico had just started to, Mesonyx and the other mesonychid mesonychians (mesonychians part IV), Because we all love Paleogene 'ungulates', Five things you didn't know about armadillos. A strong blow to this region can fracture the bones around the pterion. Mesonychia ("Middle Claws") are an extinct order of medium to large-sized carnivorous mammals that were closely related to artiodactyls (even-toed ungulates), and to cetaceans (dolphins and whales). Cleft lip is a common development defect that affects approximately 1:1000 births, most of which are male. Contributions are fully tax-deductible. Small nerve branches from the olfactory areas of the nasal cavity pass through these openings to enter the brain. . It stood 30-60 cm (1-2 feet) high at the shoulder, depending on the species. If an error occurs in these developmental processes, a birth defect of cleft lip or cleft palate may result. Synoplotherium may also be part of this Harpagolestes-Mesonyx clade, and Zhou et al. . The molars were laterally compressed and often blunt and were probably used for shearing meat or crushing bones. Figure17. Mesonychid - Wikipedia In Janis, C. M., Scott, K. M. & Jacobs, L. L. (eds) Evolution of Tertiary Mammals of North America. These, then, are the major features of whales. Lateral to this is the elongated and irregularly shaped superior orbital fissure, which provides passage for the artery that supplies the eyeball, sensory nerves, and the nerves that supply the muscles involved in eye movements. Surgical repair is required to correct cleft palate defects. [4] In contrast to arctocyonids, the mesonychids had only four digits furnished with hooves supported by narrow fissured end phalanges. The unpaired ethmoid bone is located at the midline within the central skull. The prezygapophyses should be the ones with the articular surfaces directed medially, and the postzygapophyses those with the articular surface directed laterally, more similar to the condition in other tetrapods (and mammals, according to Fowler, http://www.archive.org/details/introductiontoos1885flow). The Ear: Anatomy, Function, and Treatment - Verywell Health And another matter, given that mesonychian meat processing really didn't seem to be up to snuff, compared to modern carnivorans, their traditional characterisation as archaic,'inferior' predators might have some credit after all. Mesonychians possess unusual triangular molar teeth that are similar to those of Cetacea (whales and dolphins), especially those of the archaeocetids, as well as having similar skull anatomies and other morphologic traits. It passes behind the ear drum and between two tiny bones of the middle ear called the incus and malleus.

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