science, natural phenomena, and medicine |
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Latest Posts on: science, natural phenomena, and medicine
Retrieved latest 5 posts at: http://science-naturalphenomena.blogspot.com/feeds/posts/default
First Stone Tools
The first known stone tools came from Africa and date back beyond the Pleistocene, or Ice Age, more than one million years ago. These were the pebble tools used by the Australopithecines. They were made of crudely shaped lava or quartz pebbles a little larger than a man's fist. Sometimes the pebbles were broken or chipped on two sides to form a sim..
Posted on 23 May 2012 | 8:11 pm
Organ of Corti
The organ of Corti is a spiral-shaped structure located on the cochlea's basilar membrane. Named after the Italian anatomist Alberto Corti, it is composed of neuroepithelial hair cells as well as supporting cells. These neuroepithelial hair cells of the organ of Corti are receptors for hearing, transforming acoustic vibrations into nerve impulses t..
Posted on 22 May 2012 | 4:24 pm
Java Man, Peking Man and Fire Making
About half a million years ago, a new type of man, probably descended from the Australopithecines, evolved in eastern Asia. Some of these early men lived in the jungle near the Solo River, central Java. In 1891, Dutch army doctor Eugene Dubois discovered the fosil remains of an ancient hominid that he called Pithecanthropus erectus, meaning the "Ap..
Posted on 21 May 2012 | 8:44 pm
Cochlea
Located in the petrous portion of the temporal bone, the cochlea is a spiral tube which is a part of the inner ear, resembling a snail shell. The inner walls of the cochlea are lined with a fine layer of epithelium tissue as a thin membrane divides the spiralled tube along its length into two spaces which are filled with fluids. It contains the org..
Posted on 20 May 2012 | 8:31 pm
Hominid
A hominid is any of the bipedal primates belonging to the Hominidae family, which includes all the species of the genera Australopithecus, as well as Homo erectus and Homo sapiens (Neanderthal and Cro-Magnon). The only surviving hominid today is Homo sapiens or modern man...
Posted on 19 May 2012 | 7:27 pm