Glossary
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Glossary Terms for letter: O
occipital bun A cranial feature of Neandertals in which the occipital bone projects substantially from the skull's posterior.
Oldowan Complex The stone tool culture associated with H. habilis and, possibly, A. garhi, including primitive chopper tools.
olfactory bulb The portion of the anterior brain that detects odors.
oligopithecids The earliest anthropoid ancestors in the Oligocene, found in the Fayum, Egypt.
omomyids Eocene euprimates that may be ancestral to tarsiers.
opposable Refers to primates' thumb, in that it can touch each of the four fingertips, enabling a grasping ability.
oreopithecids Miocene apes that were found in Europe.
Oreopithecus A genus of oreopithecids found in Italy that was extinct within a million years of its appearance.
Orrorin tugenensis A pre-australopithecine species found in East Africa that displayed some of the earliest evidence of bipedalism.
osteoarthritis Degenerative changes of the joints caused by a variety of factors, especially physical activity and mechanical stress.
osteoblasts Cells responsible for bone formation.
osteoclasts Cells responsible for bone resorption.
osteoporosis The loss of bone mass often due to age, causing the bones to become porous, brittle, and easily fractured.
Ouranopithecus A genus of Miocene dryopithecids found in Greece.
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