Cephalic index 75-80 is seen in:-
**Core Concept**
The cephalic index is a numerical value used to categorize the shape and size of the human skull. It is calculated by dividing the maximum width of the head by its maximum length, then multiplying by 100 to obtain a percentage value.
**Why the Correct Answer is Right**
A cephalic index of 75-80 falls within the range of mesocephalic skulls, which are characterized by a relatively equal balance between the width and length of the skull. This is in contrast to dolichocephalic skulls (index 80), which are shorter and wider. The mesocephalic skull is typically associated with European and Asian populations.
**Why Each Wrong Option is Incorrect**
* **Option A:** Incorrect because a dolichocephalic skull would have a cephalic index less than 75, not 75-80.
* **Option B:** Incorrect because a brachycephalic skull would have a cephalic index greater than 80, not 75-80.
* **Option C:** Incorrect because the cephalic index is not typically used to describe cranial shape in relation to sex; it is more often used to describe racial or ethnic differences.
**Clinical Pearl / High-Yield Fact**
A simple way to remember the different types of skulls is to associate them with the geographical origins of the populations that typically exhibit them: dolichocephalic skulls are often associated with African populations, brachycephalic skulls are often associated with East Asian populations, and mesocephalic skulls are often associated with European populations.
**Correct Answer: C. European populations.**