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Shape

Irregular Bones

Complicated shapes.
They consist of mainly spongy bone enclosed by thin layers of compact bone.
Examples: some skull bones, the vertebra and innominate bones

Flat bones

Thin, flattened and frequently curved.
They have a pair of spongy bone sandwiched between two layers of compact bone.
Examples: bones of the cranium, the ribs and sternum.

Examples of Irregular Bones

Some skull bones
The vertebra
innominate bones

Examples of Flat Bones

Bones of the cranium
The Ribs
The Sternum

Short Bones

Cube shaped consisting mainly of spongy bone.
Examples: carpals and tarsals

Examples of Short Bones

Carpals
Tarsals

Seasmoid Bones

specialized type of short bone that are formed and embedded within a tendon.
Example: the patella, pisiform bone (a carpal), and bones located at the base of the big toe (hallux) and thumb (pollux)

Big Toe

Hallux

Thumb

Pollux

Examples of Seasmoid Bones

Patella (knee cap)
Pisiform bone (a carpal)
bones located at the base of the big toe (hallux) and
thumb (pollux)

Long Bones

Longer than they are wide.
They have a shaft with heads at both ends.
Consist of mostly compact bone.
Examples: Long bones of the limbs

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