Irregular bone

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Irregular bone
Sobo 1909 53.png
Sphenoid bone, one of the most complex bone of the human body, is classified as irregular bone.
Irregular bones - anterior view - with legend.png
Irregular bones in human skeleton. (shown in red).
Details
Latin os irregulare
Identifiers
Gray's p.80
Dorlands
/Elsevier
o_07/12598430
TA A02.0.00.014
FMA 7477
Anatomical terms of bone

The irregular bones are bones which, from their peculiar form, cannot be grouped as long bone, short bone, flat bone or sesamoid bone. Irregular bones serve various purposes in the body, such as protection of nervous tissue (such as the vertebrae protect the spinal cord), affording multiple anchor points for skeletal muscle attachment (as with the sacrum), and maintaining pharynx and trachea support, and tongue attachment (such as the hyoid bone). They consist of cancellous tissue enclosed within a thin layer of compact bone. Irregular bones can also be used for joining all parts of the spinal column together. The spine is the place in the human body where the most irregular bones can be found. There are, in all, 33 irregular bones found here.

The irregular bones are: the vertebræ, sacrum, coccyx, temporal, sphenoid, ethmoid, zygomatic, maxilla, mandible, palatine, inferior nasal concha, and hyoid.

Additional images[edit]

References[edit]

This article incorporates text from a public domain edition of Gray's Anatomy.