🎶 Your hip bone's connected to your thigh bone 🎶
The human skeletal system is not quite as simple as the popular children's song suggests. The"head bone" is not connected to the"neck bone," but rather to a series of small bones that go all the way down the back. And the"toe bone" is actually made up of several bones that connect to another set of bones that provide structure for the foot. In total, the human skeleton consists of a whopping 206 bones.
Our bones are separated into two categories based on the purpose and location of the bones: The axial skeleton and the appendicular skeleton, according to the SEER program of the National Cancer Institute. Bones are further classified by their shape: long, short, flat, irregular or sesamoid, according to SEER.
Approximately 80% of every bone is compact bone, which is the hardest and strongest type of bone and is what allows the body to support its weight. Compact bone makes up the outer layers of the bone and protects the inner parts of the bones where many vital functions occur, such as bone marrow production. Compact bone consists primarily of cells called osteocytes. Microscopic passages in between the cells to allow nerves and blood vessels to pass through.
The other half of marrow is yellow bone marrow, which is found in long bones, such as thigh bones, and consists primarily of fat. Blood vessels run through both types of bone marrow to deliver nutrients and remove waste from the bones. Osteocytes, found in the compact bone, are responsible for exchanging minerals and communicating with other cells in the vicinity. They are formed from old osteoblasts that have gotten stuck in the center of bones.
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