Search results
Results from the WOW.Com Content Network
The giraffe's head and neck are held up by large muscles and a nuchal ligament, which are anchored by long thoracic vertebrae spines, giving them a hump. [17] [62] [35] Adult male reticulated giraffe feeding high on an acacia, in Kenya. The giraffe's neck vertebrae have ball and socket joints.
Skeletons of humans and birds compared by Pierre Belon, 1555. The first specifically anatomical investigation separate from a surgical or medical procedure is associated by Alcmaeon of Croton. [3] Leonardo da Vinci made notes for a planned anatomical treatise in which he intended to compare the hands of various animals including bears. [4]
Human walking is about 75% less costly than both quadrupedal and bipedal walking in chimpanzees. Some hypotheses have supported that bipedalism increased the energetic efficiency of travel and that this was an important factor in the origin of bipedal locomotion. Humans save more energy than quadrupeds when walking but not when running.
Each vertebra (pl.: vertebrae) is an irregular bone with a complex structure composed of bone and some hyaline cartilage, that make up the vertebral column or spine, of vertebrates. The proportions of the vertebrae differ according to their spinal segment and the particular species.
Skeletons of a human and an elephant. Comparative foot morphology involves comparing the form of distal limb structures of a variety of terrestrial vertebrates.Understanding the role that the foot plays for each type of organism must take account of the differences in body type, foot shape, arrangement of structures, loading conditions and other variables.
Human predecessors didn’t just decide to venture out of Africa en masse. ... and now the discovery of a 1.5-million-year-old fossil vertebra from an ancient hominid species is revealing more ...
Originally, as narrated in a recent history of the field, [2] physiology focused primarily on human beings, in large part from a desire to improve medical practices. When physiologists first began comparing different species it was sometimes out of simple curiosity to understand how organisms work but also stemmed from a desire to discover basic physiological principles.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!