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Galen's understanding of anatomy and medicine was principally influenced by the then-current theory of the four humors: black bile, yellow bile, blood, and phlegm, as first advanced by the author of On the Nature of Man in the Hippocratic corpus. [11] Galen's views dominated and influenced Western medical science for more than
The four temperament theory is a proto-psychological theory which suggests that there are four fundamental personality types: sanguine, choleric, melancholic, and phlegmatic. [ 2 ] [ 3 ] Most formulations include the possibility of mixtures among the types where an individual's personality types overlap and they share two or more temperaments.
It was a factory and a smelter’s furnace. The rest of the parts of the body and their actions resulted from the 4 elements combination, the humors and the qualities. Galen made a proposal of natural faculties’ theory in which every part of the body had the ability to retain, attract its nutritive humors as well as expelling the excrements.
Empedocles's theory suggested that there are four elements: earth, fire, water, and air, with the earth producing the natural systems. Since this theory was influential for centuries, later scholars paired qualities associated with each humor as described by Hippocrates/Galen with seasons and "basic elements" as described by Empedocles. [39]
Balloonist theory was a theory in early neuroscience that attempted to explain muscle movement by asserting that muscles contract by inflating with air or fluid. The Roman and Greek physician Galen believed that muscles contracted due to a fluid flowing into them, and for 1500 years afterward, it was believed that nerves were hollow and that they carried fluid. [1]
Galen was a prolific writer from whose surviving works comes what Galen believed to be the definitive guide to a healthy diet, based on the theory of the four humours. [13] Galen understood the humoral theory in a dynamic sense rather than static sense such that yellow bile is hot and dry like fire; black bile is dry and cold like earth; phlegm ...
[52] [53] Medical students continued to study Galen's writings until well into the 19th century. Galen conducted many nerve ligation experiments that supported the theory, which is still accepted today, that the brain controls all the motions of the muscles by means of the cranial and peripheral nervous systems. [54]
A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.