ANTHROP 1AA3 Lecture Notes - Lecture 6: Depth Perception, Oligocene, Petrous Part Of The Temporal Bone
30 Sep 2016
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Document Summary
Teeth (many types incisors, canines, premolars, molars) eat a variety of foods and process food efficiently. Forward facing eye orbits increased emphasis on vision, most visual stimuli. Stereoscopic vision fields of vision provided by each eye overlap, resulting in what"s called depth perception. Three bones of the middle ear housed in a skull outgrowth (the auditory or petrosal bulla) Two separate bones in the forearm lower leg having two bones allow for better limb motion and more precise movements. Nails instead of claws nails allow primates to manipulate objects more easily. Increased thumb mobility manipulating objects, mobility increases across the primate order from lemurs and lorises apes, and humans. Grasping feet primates have big toe mobility to grasp and climb, except humans walking. Late cretaceous or early palaeocne, 1st major radiation of placental mammals. Reconstructions of early primate-like mammals (not actual primates) from palaeocne (location : america) 55. 34 mya, defeinite presence of primates: adapids and omomyids.
