The eleventh rib and the twelfth rib, the floating ribs, have a single articular facet on the head, which is of rather large size.
12.
The sternum is composed of highly vascular tissue, covered by a thin layer of compact bone which is thickest in the manubrium between the articular facets for the clavicles.
13.
The lateral condyle presents posteriorly a flat articular facet, nearly circular in form, directed downward, backward, and lateralward, for articulation with the head of the fibula.
14.
It is attached, above, to the groove between the articular facets of the under surface of the talus; below, to a corresponding depression on the upper surface of the calcaneus.
15.
The tibia of the lower leg was expanded at the upper end, its articular facet ( where it articulated with the femur ) was wide, and its shaft was compressed from front to back.
16.
The superior articular processes are thin plates of bone projecting upward from the junctions of the pedicles and laminae; their articular facets are practically flat, and are directed backward and a little lateralward and upward.
17.
The tenth thoracic vertebra has ( except in the cases just mentioned ) an entire articular facet ( not demi-facet ) on either side, which is placed partly on the lateral surface of the pedicle.
18.
The base presents, as a rule, no articular facets ( joint surfaces ) on its sides, but occasionally on the lateral side there is an oval facet, by which it articulates with the second metatarsal.
19.
The articular facets for the heads of the ribs are of large size, and placed chiefly on the pedicles, which are thicker and stronger in this and the next vertebra than in any other part of the thoracic region.
20.
The genus " Aeolosaurus " is diagnosed by the shared presence of down-curved prezygapophyses on its anterior caudal vertebrae and chevrons from the anterior and middle portions of the tail with concave posterodorsal surfaces that contain double articular facets.
