Changes

Found in the skull, pelvic girdle, and scapula. It expands in two directions, with a broad surface for attachment of large muscle masses and protection of underlying structures.

Found in the skull, pelvic girdle, and scapula. It expands in two directions, with a broad surface for attachment of large muscle masses and protection of underlying structures.

'''Sesamoid Bones'''

4. '''Sesamoid Bones'''

Eg. Patella and navicular bone. Found within tendons, where they change direction over prominences that would otherwise cause damage. They form '''synovial joints''' with major bones with which they are in contact. They also serve to displace tendon from the axis of the joint, increasing the leverage exerted by the muscle.

Eg. Patella and navicular bone. Found within tendons, where they change direction over prominences that would otherwise cause damage. They form '''synovial joints''' with major bones with which they are in contact. They also serve to displace tendon from the axis of the joint, increasing the leverage exerted by the muscle.

'''Splanchnic Bones'''

5. '''Splanchnic Bones'''

Develop in soft organs remote from skeletal connection, eg. '''os penis'''.  

Develop in soft organs remote from skeletal connection, eg. '''os penis'''.  

'''Pneumatic Bones'''

6. '''Pneumatic Bones'''

Excavated to contain air spaces, such as the skull in the instance of paranasal sinuses, and the post-cranial skeleton of birds.

Excavated to contain air spaces, such as the skull in the instance of paranasal sinuses, and the post-cranial skeleton of birds.