Go to curiositystream.com/minute to get a free month trial with CuriosityStream and get a subscription to Nebula bundled in for free!   Because the ossification process can differ so much from human to human, we have a wide range of potential bone numbers.   Thanks also to our Patreon patrons https://www.patreon.com/MinuteEarth and our YouTube members. ___________________________________________ To learn more, start your googling with these keywords:  Cartilage: The flexible connective tissue that is turned to bone by osteoblasts.Osteoblasts: Cells that control calcium and mineral deposition to turn cartilage into bone.Sesamoids: Bones embedded in tendons or muscles.Fabella: A large sesamoid bone occasionally found behind the knee joint. Coccyx: The small set of semi-fused triangular bones at the end of the vertebral column. ___________________________________________ Subscribe to MinuteEarth on YouTube: Support us on Patreon: And visit our website: https://www.minuteearth.com/   Say hello on Facebook: http://goo.gl/FpAvo6 And Twitter: http://goo.gl/Y1aWVC   And download our videos on itunes:  https://goo.gl/sfwS6n ___________________________________________ Credits (and Twitter handles): Script Writer, Editor and Video Director and Narrator: David Goldenberg (@dgoldenberg) Video Illustrator: Arcadi Garcia (@garirius) With Contributions From: Henry Reich, Alex Reich, Kate Yoshida, Ever Salazar, Peter Reich, Julián Gómez, Sarah Berman  Music by: Nathaniel Schroeder: ___________________________________________   References:   Goldberg I, Nathan H. (1987). Anatomy and pathology of the sesamoid bones. The hand compared to the foot. International Orthopaedics. 11(2):141-7. Retrieved from: https://www.ncbi.nlm.nih.gov/pubmed/3610408.Vineet K. Sarin  Gregory M. Erickson  Nicholas J. Giori A. Gabrielle Bergman  Dennis R. Carter (2003). Coincident development of sesamoid bones and clues to their evolution. The Anatomical Record.5: 174-180. Retrieved from: https://onlinelibrary.wiley.com/doi/epdf/10.1002/%28SICI%291097-0185%2819991015%29257%3A5%3C174%3A%3AAID-AR6%3E3.0.CO%3B2-O. Tao Sun, Lingxiang Wang, Haitao Zhao,Wenjuan Wu,and Wenhai Hu (2016). Prevalence, morphological variation and ossification of sesamoid bones of the forefoot: a retrospective radiographic study of 8,716 Chinese subjects. 2(3): 91–96. Retrieved from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410651/. Postacchini F, Massobrio M. (1983). Idiopathic coccygodynia: Analysis of fifty-one operative cases and a radiographic study of the normal coccyx. The Journal of bone and joint surgery. 65(8): 1116-1124. Retrieved from: https://www.coccyx.org/medabs/posta.htm.Meals, Roy. (2019). Personal Communication. http://www.AboutBone.com