Chiasma

 

                                                      Thomas Willis = Circle Of Willis 

                                                                     Thomas Willis 

Greek Letter chi (X) = CHIASMA 

The word "chiasma" (from Greek χίασμα, meaning "crossing" or "X-shaped") was introduced into anatomical terminology by the 17th-century anatomist Thomas Willis (1621–1675).

• Thomas Willis, an English physician and anatomist, is best known for his work on the brain’s vascular system, especially the Circle of Willis.

• In his 1664 book "Cerebri Anatome", Willis described the optic chiasma as an X-shaped structure at the base of the brain where the optic nerves partially cross.

• He used the term chiasma because the crossing resembled the Greek letter chi (Χ).

                                                              Neural Pathway Of Vision

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