human muscular system: lateral viewLateral view of the human muscular system. Characteristicof the vertebrate form, the human body has an internalskeletonthat includes a backbone of vertebrae. Typical of mammalian structure, the human body shows such characteristics ashair,mammary glands, and highly ...
of the wall of the chest, orthorax. The connection of the ribs to the breastbone—thesternum—is in all cases a secondary one, brought about by the relatively pliablerib(costal) cartilages. The small joints between the ribs and the vertebrae permit a gliding motion of the ribs on the ...
Sacrum, wedge-shaped triangular bone at the base of the vertebral column, above the caudal (tail) vertebrae, or coccyx, that articulates (connects) with the pelvic girdle. In humans it is usually composed of five vertebrae, which fuse in early adulthood.