how many bones are here in a human adult's body ???
Answers
Answer:
The human skeleton is the internal framework of the human body. It is composed of around 270 bones at birth – this total decreases to around 206 bones by adulthood after some bones get fused together. The bone mass in the skeleton reaches maximum density around age 21.
☺️Mark my answer as BRAINLIEST ☺️
The human skeleton of an adult consists of around 206 to 208 bones, depending on the counting of the sternum (which may alternatively be included as the manubrium, body of sternum, and the xiphoid process) It is composed of 270 bones at birth, but later decreases to 80 bones in the axial skeleton and 126 bones in the appendicular skeleton. Many small accessory bones, such as some sesamoid bones, are not included in this count.
As a human ages, some of its bones fuse, a process which typically lasts until sometime within the third decade of life. Therefore, the number of bones in an individual may be evaluated differently throughout their life. In addition, the bones of the skull and face are counted as separate bones, despite being fused naturally. Some reliable sesamoid bones such as the pisiform are counted, while others, such as the hallux sesamoids, are not.
Individuals may have more or fewer bones than the average (even accounting for developmental stage) owing to anatomical variations. The most common variations include sutural (wormian) bones, which are located along the sutural lines on the back of the skull, and sesamoid bones which develop within some tendons, mainly in the hands and feet. Some individuals may also have additional (i.e., supernumerary) cervical ribs or lumbar vertebrae.
The axial skeleton, comprising the spine, chest and head, contains 80 bones. The appendicular skeleton, comprising the arms and legs, including the shoulder and pelvic girdles, contains 126 bones, bringing the total for the entire skeleton to 206 bones.
Spine (vertebral column)
A fully grown adult features 26 bones in the spine, whereas a child can have 34.
- Cervical vertebrae (7 bones)
- Thoracic vertebrae (12 bones)
- Lumbar vertebrae (5 bones)
- Sacrum (5 bones at birth, fused into one after adolescence)
- Coccygeal vertebrae/Cordal (set of 4 bones at birth; some or all fuse together, but there seems to be a disagreement between researchers as to what the most common number should be. Some say the most common is 1, others say 2 or 3, with 4 being the least likely. It is counted as 1 in this article.