What 206 bones actually means

An adult skeleton has 206 bones, and anatomists split them down the middle. Eighty of them make up the axial skeleton, which is the skull, the spine and the rib cage, and the other 126 make up the appendicular skeleton, which is your arms and legs and the girdles that hang them off the trunk.

Babies have more, because a lot of bones start out in pieces and fuse as you grow, and some adults keep a spare or two. But 206 is the standard count, and it is the one The Bone Room works to.

Counts follow OpenStax, Anatomy and Physiology 2e, section 7.1, Divisions of the Skeletal System.

In The Bone Room’s curriculum, 48 bones are taught by their own individual names, and because most of them come as a left and a right, those 48 names cover 84 bones.

The other 122 bones are introduced through numbered or grouped sets, which is also how anatomy usually refers to them. The 24 ribs are numbered one to 12 on each side. The 22 vertebrae of the neck and back go by their region and a number, so a doctor says C3 or T7, and only atlas and axis at the very top carry names of their own. The 20 long bones in your palms and the soles of your feet are numbered too, and so are the 56 phalanges in your fingers and toes, which the lab teaches by row.

The wrist and the ankle are the surprise in the other direction. Each of the 8 bones in a wrist and the 7 bones in an ankle has its own name, and so does each of the 8 bones of the braincase. Those are the ones people are usually delighted to find out about.

Start learning

This is the full list, generated from the same records the app teaches from, so if the curriculum ever changes this page changes with it.

The lab teaches the 48 individual names, and it teaches the counted sets as what they are, so you learn the ribs as the ribs and the finger bones as the phalanges rather than memorizing a name for each. That comes to 67 case entries across 15 case files, and between them they account for every one of the 206.

The same table sits inside the app, so you can always see what has been covered. Here is how an examination works, if you want the rest of the system.