Irregular bone in the human body refers to irregularly shaped bones, except for long bones, short bones, flat bones can be called irregular bones, mainly including vertebrae, cranial bones, foot bones. 1. Vertebral bones: irregular bones belonging to the spinal column, such as thoracic, lumbar, caudal, sacral and cervical vertebrae, etc. These bones belong to the range of irregular bones, and their shape is extremely irregular. 2. Craniofacial bones: belonging to the irregular bones of the head and face, there are the frontal bone, the butterfly bone, the sieve bone, the lower cervical bone, the upper cervical bone, the palate, the mandible, the hyoid bone, the auditory bone, the lacrimal bone, and the nasal bone, and so on. 3. Pedipalp bones: belonging to the irregular bones of the foot, there are heel bone, dice bone, navicular bone, cuneiform bone, lunate bone, triangular bone, pea bone, small polygonal bone, cephalic bone, hook bone, and large horn bone.