Medullary cavity - Wikipedia Medullary cavity Medullary Cavity A long bone, with medullary cavity labeled near center. Details Identifiers Latin cavitas medullaris TA A02. 0.00. 037 FMA 83698 Anatomical terminology ( edit on Wikidata ) The medullary cavity ( medulla, innermost part ) is the central cavity of bone shafts where red bone marrow and / or yellow bone marrow ( adipose tissue ) is stored ; hence, the medullary cavity is also known as the marrow cavity. Located in the main shaft of a long bone ( diaphysis ) ( consisting mostly of compact bone ), the medullary cavity has walls composed of spongy bone ( cancellous bone ) and is lined with a thin, vascular membrane ( endosteum ). However, the medullary cavity is the area inside any bone ( long, flat, etc. ) that holds the bone marrow. This area is involved in the formation of red blood cells and white blood cells, and the calcium supply for bird eggshells. Intramedullary is a medical term meaning the inside of a bone. Examples include intramedullary rods used to treat bone fractures in orthopedic surgery and intramedullary tumors occurring in some forms of cancer or benign tumors such as an enchondroma. References Jump up ^ Martini F., & Nath J.L. ( 2009 ). Fundamentals of Anatomy and Physiology 8e. San Francisco, CA : Pearson Education Inc. External links `` Medullary cavity '' at Dorland 's Medical Dictionary Bone and cartilage Cartilage perichondrium fibrocartilage callus metaphysis Cells chondroblast chondrocyte Types hyaline elastic fibrous Bone Ossification Primary bone intramembranous endochondral Cells osteoblast osteoid osteocyte osteoclast Types cancellous cortical Regions subchondral bone epiphysis epiphyseal plate / metaphysis diaphysis Condyle Epicondyle Structure Osteon Haversian canals Volkmann 's canals connective tissue endosteum periosteum Sharpey 's fibres enthesis lacunae canaliculi trabeculae medullary cavity bone marrow Shapes long short flat irregular sesamoid This human musculoskeletal system article is a stub. You can help Wikipedia by expanding it. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Medullary_cavity&oldid=746217746 '' Categories : Skeletal system Musculoskeletal system stubs Talk About Wikipedia বাংলা Deutsch Suomi Türkçe Edit links This page was last edited on 26 October 2016, at 00 : 40. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: where do the medullary cavities of bone exist
Answer: main shaft of a long bone