Bone tissue that forms directly within mesenchyme, and does not replace other tissues[TAO]. Intramembranous ossification is the formation of bone in which osteoblasts secrete a collagen-proteoglycan matrix that binds calcium salts and becomes calcified[GO]. Intramembranous ossification is the way flat bones and the shell of a turtle are formed[GO]. Unlike endochondral ossification, cartilage is not present during intramembranous ossification[WP]. [ http://amigo.geneontology.org/amigo/term/GO:0001957 http://en.wikipedia.org/wiki/Intramembranous_ossification ]
Term information
note the distinction between intramembranous bone and intramembranous bone tissue. Some bones may be a mixture of both tissue types. The MA class most likely refers to a tissue type (it is under bone tissue and connective tissue; there are no child classes)
Term relations
- bone tissue
- part of some intramembranous bone
- develops from some mesenchyme
- output of some intramembranous ossification