The earliest period at which I have been able to detect the existence of the spleen in the human embryo is at the second month.
The general framework of the body is built up mainly of a series of bones, supplemented, however, in certain regions by pieces of cartilage; the bony part of the framework constitutes the skeleton.
Fracture of the patella may be produced by muscular action or by direct violence. When produced by muscular action, it occurs thus: a person in danger of falling forwards attempts to recover himself by throwing the body backwards, and the violent action of the quadriceps extensor upon the patella snaps the bone transversely across.
I have removed the spleen from a dog, from cats, and rabbits. In all cases, the animals survived the operation and did not appear to be in the least affected by the absence of the organ.
Bone is one of the hardest structures of the animal body; it possesses also a certain degree of toughness and elasticity.
Descriptive Anatomy comprises a detailed account of the numerous organs of which the body is formed, especially with reference to their outward form, their internal structure, the mutual relations they bear to each other, and the successive conditions they present during their development.
