Jean Pecquet
Jean Pecquet was a French scientist. He studied the expansion of air, wrote on psychology
Psychology is the study of the mind and behavior. Its immediate goal is to understand individuals and groups by both establishing general principles and researching specific cases. For many, the ultimate goal of psychology is to benefit society...

, and is also known for investigating the thoracic duct
Thoracic duct
In human anatomy, the thoracic duct of the lymphatic system is the largest lymphatic vessel in the body. It is also known as the left lymphatic duct, alimentary duct, chyliferous duct, and Van Hoorne's canal....

. Furthermore, he studied the nature of vision.


He studied medicine at Montpelier, where he made the important discovery of the course of the lacteal vessels, including the receptaculum chyli
Cisterna chyli
The cisterna chyli is a dilated sac at the lower end of the thoracic duct into which lymph from the intestinal trunk and two lumbar lymphatic trunks flow.-Flow of lymph:...

, or reservoir of Pecquet, as it is sometimes called, and the termination of the principal lacteal vessel, the thoracic duct, into the left subclavian vein. He dissected the eye and measured its dimensions. Contrary to Edme Mariotte
Edme Mariotte
Edme Mariotte was a French physicist and priest.- Biography :Edme Mariotte was the youngest son of Simon Mariotte, administrator at the district Til-Châtel , and Catherine Denisot . His parents lived in Til-Châtel and had 4 other children: Jean, Denise, Claude, and Catharine...

, he maintained that the retina, not the choroid, was the principal organ of vision. He wrote:
  • Experimenta Nova Anatomica (Paris, 1651; English translation, as New Anatomical Experiments, 1653)
  • De Circulatione Sanguinis et Chyli Motu (1653)
  • De Thoracicis Lacteis (1653)

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