anatomy · section one
the skeleton
206 bones · 237 joints
Point at the drawing, or search for a bone by any name you know it by. Choosing one marks it in ink and turns everything it joins onto green, because a bone on its own tells you almost nothing — what it does is decided by what it is attached to.
green marks what it joins onto
“clavicle. two of them.”
appendicular skeleton · shoulder
Clavicle
Clavicula · two of them · also called collarbone
It works as a strut that props the shoulder out away from the chest, so the arm can swing clear of the body instead of collapsing inwards. Run a finger along the top of your chest from the notch at the base of your throat out to the point of your shoulder - the whole bone lies directly under the skin the entire way.
it starts turning to bone in week five of life, earlier than any other bone, yet finishes last at about 25
what it joins onto
- sternoclavicular jointsynovial saddle with an articular disclets the shoulder shrug, swing forward and rotate
- acromioclavicular jointsynovial planesmall glides as the shoulder blade tilts and turns
62 entries, 206 bones