Irregular bones do not fit any of the other categories. Their shapes are unique and complicated. They consist of thin layers of compact bone surrounding a spongy interior.
What is irregular bones?
Irregular bones are made up of thin cortical bone layers that surround a spongy bone interior. Their forms are asymmetrical and complex. The vertebrae and the bones of the pelvis are examples of irregular bones.
Irregular bones provide a variety of functions in the body, including protecting neurological tissue (as the vertebrae do), providing many anchor sites for skeletal muscle attachment (like the sacrum does), and preserving pharynx and trachea support, as well as tongue attachment (such as the hyoid bone).
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