Other types of raised skin bumps can be caused by skin cancer. There are several types of skin cancer, all requiring medical management and treatment: Actinic keratosis is a precancerous skin condition characterized by scaly, crusty spots on areas of sun-exposed skin, such as hands, arms, or face.
osteocyte[osâ²tÄ-Å-sÄ«tâ²] Type:Term. Definitions. 1. A cell of osseous tissue that occupies a lacuna and has cytoplasmic processes that extend into canaliculi and make contact by means of gap junctions with the processes of other osteocytes.
os'teÂ·oÂ·clas'tic adj. osteoclast. A specialized bone cell that absorbs bone, allowing for the deposition of new bone and maintenance of bone strength. Osteoclasts secrete enyzmes that dissolve the matrix of old bone tissue and acids that dissolve bone salts, which contain calcium and phosphorus. Except in growing bone, the rate of bone deposition and bone absorption equal each other so that bone mass remains constant. A mass of osteoclasts absorbs bone from the outer surfaces inward for about three weeks.