Final answer:
Bone markings in the body can vary in size and shape and are classified into three categories. An elongated basin is a type of bone marking that allows blood vessels and nerves to enter the bone. Other examples of bone markings include small pits, grooves, passages, slits, and air-filled spaces.
Step-by-step explanation:
Bone Markings
The surface features of bones vary considerably, depending on the function and location in the body. There are three general classes of bone markings: (1) articulations, (2) projections, and (3) holes. An elongated basin is an example of a hole through a bone. It is an opening or groove in the bone that allows blood vessels and nerves to enter the bone. Its size and shape reflect the size of the vessels and nerves that penetrate the bone at that point.
Examples of other bone markings include small pits, grooves, passages, slits, and air-filled spaces in bones.