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The confluence of sinuses (Latin: confluens sinuum), torcular Herophili, or torcula is the connecting point of the superior sagittal sinus, straight sinus, and occipital sinus. It is below the internal occipital protuberance of the skull. It drains venous blood from the brain into the transverse sinuses.
The occipital sinus is the smallest of the dural venous sinuses.It is usually unpaired, and is sometimes altogether absent. It is situated in the attached margin of the falx cerebelli.
The Canon Sinuum was a historic table of sines thought to have given the sines to 8 sexagesimal places between 0 and 90 degrees in steps of 2 arc seconds. Some authors believe that the table was only between 0 and 45 degrees. It was created by Jost Bürgi at the end of the 16th century. Such tables were essential for navigation at sea.
The straight sinus is situated within the dura mater, where the falx cerebri meets the midline of tentorium cerebelli. [1] It forms from the confluence of the inferior sagittal sinus and the great cerebral vein.
Bürgi used these algorithms, including multiplication table in sexagesimal system, to compute a Canon Sinuum, a table of sines to 8 sexagesimal places in steps of 2 arc seconds. Such tables were extremely important for navigation at sea.
Hygrotus confluens (Fabricius, 1787) Hygrotus confluens is a species of Dytiscidae native to Europe. [1] [2] References This page was last edited on 18 ...
The Canon Sinuum is the main part of Bartholomaeus Pitiscus' Thesaurus Mathematicus sive Canon Sinuum ad radium 1.00000.00000.00000 published as a folio in 1613 (misprinted on two of the titles 1513, by omission of a C in the Roman numeral MLCXIII) in Frankfurt.
Bürgi used these algorithms to calculate a Canon Sinuum, a table of sines in steps of 2 arc seconds. It is thought that this table had 8 sexagesimal places. Some authors have speculated that this table only covered the range from 0 to 45 degrees, but nothing seems to support this claim. Such tables were extremely important for navigation at sea.