bone element
irregular bone
UMLS:C0502414
NCIT:C32881
os irregulare
uberon
SCTID:421560006
FMA:7477
Wikipedia:Irregular_bone
UBERON:0008001
os irregulare
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, 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. The irregular bones are: the vertebrC&, sacrum, coccyx, temporal, sphenoid, ethmoid, zygomatic, maxilla, mandible, palatine, inferior nasal concha, and hyoid.