Articulata

Definition and stakes

M. le Clerc,  The Compleat Surgeon — Introduction (1696)

“ Enarthrosis is a kind of Articulation which unites two Bones with a great Head on one side, and a large Cavity on the other; as the Head of the Thigh-Bone in the Cavity of the Ischion or Huckle-Bone.
Arthrodia is a sort of Articulation, by the means whereof two Bones are join'd together with a flat Head receiv'd into a Cavity of a small depth. Such is the Head of the Shoulder-Bone with the Cavity of the Omoplata or Shoulder-Blade; and that of the Twelfth Vertebra of the Back with the first of the Loins.
”
Source: Wikisource

Charles Morris,  Popular Science Monthly (1881)

“ There is nothing in this like the welding of segments in the Articulate. The vertebrate joints display none of the separate vital animal functions. They yield every indication of being produced in the mode indicated, by the stress of an undulating body. The joints in the subsequent limbs resemble them in character, and seem to be formed in the same manner. The Lancelet is not jointed; it is a single individual. But the worm from which the Articulate arises is jointed, and each joint is possessed of all the vital functions. ”
Source: Wikisource

Get perspective with Kwize: daily news enlightened by great literature