Occasionally accessory bones are found in the carpus, but of more than 20 such described bones, only four (the central, styloid, secondary trapezoid, and secondary pisiform bones) are considered to be proven accessory bones. Sometimes the scaphoid, triquetrum, and pisiform bones are divided into two.
perforce definition: by or through necessity; necessarilyOrigin of perforceMiddle English par force from OFr: see per and force...
perÂ·iÂ·osÂ·teÂ·um. The dense fibrous membrane covering the surface of bones except at the joints and serving as an attachment for muscles and tendons. perâ²iÂ·osâ²teÂ·al (-tÄ-Él), perâ²iÂ·osâ²teÂ·ous (-tÄ-És) adj. periosteum. (Anatomy) a thick fibrous two-layered membrane covering the surface of bones.