membrane bone
Học thuậtThân thiện
Definition
Noun: A membrane bone is any bone that forms directly within connective tissue membranes, without a pre-existing cartilage model. This type of ossification is called intramembranous ossification. Examples include most bones of the skull and the clavicle.
Usage and Examples
- The flat bones of the cranium, such as the parietal bone, are classic examples of a membrane bone.
- In embryonic development, a membrane bone develops through the direct differentiation of mesenchymal cells into osteoblasts.
- Unlike endochondral bones, a membrane bone does not replace a hyaline cartilage template during its formation.
Advanced Usage
- The term is primarily used in the fields of comparative anatomy, embryology, and osteology to classify bones based on their developmental origin.
- It is often contrasted with endochondral bone or cartilage bone, which forms by replacing a cartilage model.
Variants and Related Words
- Intramembranous ossification (n): The specific process by which membrane bones form.
- Dermal bone (n): A related term sometimes used interchangeably, particularly in vertebrate zoology, referring to bones that develop in the dermis of the skin.
Synonyms
- Dermal bone (in specific zoological contexts)
- Intramembranous bone
Antonyms / Contrasting Terms
- Endochondral bone
- Cartilage bone
- Replacement bone
Noun
- any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull