Dessins de Léonard de Vinci

To obtain a true and perfect knowledge [of the vascular system] I have dissected more than ten human bodies, destroying all the other members, and removing the very minutest particles of the flesh by which these veins are surrounded. And as one single body would not last so long, since it was necessary to proceed with several bodies by degrees, until I came to an end and had a complete knowledge; this I repeated twice, to learn the differences…

(via unejeunedemoiselle)

Source : newyorkccops

Poissons au rayons X

X-Rays of Fish Reveal Diversity

1. X-Ray Image of a Winghead Shark:

The distinctive form of a winghead shark, Eusphyra blochii, is revealed in an X-ray image. The shark’s eyes are spread far apart, giving it superb binocular vision.

2. X-Ray Image of a Long-Spined Porcupine Fish:

The robust oval, spine covered body of a long-spined porcupine fish, Diodon holocanthus, is revealed in this X-ray image.

3. X-Ray Image of a Monterey Skate:

An X-ray image of a Monterey skate, Raja montereyensis, reveals a spine that extends like a tail out from the pelvic fin. The skeletons of skates, rays, chimaeras, and sharks are made of cartilage, rather than bone.

CREDIT: © Sandra Raredon / Smithsonian Institution

4. X-Ray Image of a Longnose Butterflyfish:

An X-ray image of a longnose butterflyfish, Forcipiger longirostris, helps scientists study the fish’s complex bone structure.

CREDIT: Sandra J. Raredon / Smithsonian Institution

(via scinerds)

Source : expose-the-light