Sternal index is to ?
**Core Concept**
The sternal index is a ratio used to determine the shape of the sternum. It is calculated by dividing the length of the sternum by its greatest width. This index helps in identifying the different types of sternums, such as anthropoid, platypelloid, or pygmy.
**Why the Correct Answer is Right**
The sternal index is particularly useful in forensic anthropology and osteology to estimate the ancestry and sex of an individual. The ratio can be used to distinguish between males and females, as well as to identify the population from which an individual originated. This is because the shape of the sternum varies among different populations, and the sternal index can provide valuable information in this regard.
**Why Each Wrong Option is Incorrect**
**Option A:** The sternal index is not used to determine the age of an individual.
**Option B:** The sternal index is not a measure of the sternum's flexibility or mobility.
**Option C:** The sternal index is not a ratio used in calculating the volume of the thoracic cavity.
**Clinical Pearl / High-Yield Fact**
The sternal index is an important parameter in forensic anthropology, as it can provide valuable information about an individual's ancestry, sex, and population of origin. This can be particularly useful in cases where other identification methods are not available.
**Correct Answer: C. Sternal index is used to determine the shape of the sternum.**