Notes on Long Bones, Ossification, and Fibrous Joints

Short bones and long bones

• Short bones are cuboidal and are found only in the wrist and the ankle (foot).

• Ossification happens a little slower, and it happens in most parts of the skeleton, especially in long bones.

Primary and secondary centers of endochondral ossification

• There are primary and secondary centers of endochondral ossification.

Joints and mobility (general idea from transcript)

• The movement, and the entire arthrosis is one that freely moves.

• Structure based on the type of tissue that separates the ends of the bones, we have the fibrous joints and the subsection.

• So that would be the syndesmosis, the suture, and the gumbosis (gomphosis).

• Those are the three types of tissue at the end of the bone.

Fibrous joints: types and definitions (as named in transcript)

• The syndesmosis. Some examples would be the SI joints, the carpal joints, or the tarsal joints.

• There’s some movement in there, but there’s not much.

• The sutures. They’re only found in the bones of the skull. Their movement is very limited.

• In adults, they’re considered immovable. So when we’re born, there’s some limited movement. But as we grow, movement becomes more restricted (i.e., limited movement as well).

• Socket-like portion (gomphosis). This is between the roots of the teeth or the alveolar sockets of the mandible and the maxilla.

Specific fibrous joint types (summary from transcript)

• Those are the different areas where you find the different types of fibrous joints.

Practical emphasis

• It’s really important to be very familiarized with our bones. There’s one of these in each of the rooms (i.e., joints/bone regions).

• Okay? Alright.