About skull of newborn, true are all except-
**Core Concept**
The skull of a newborn is composed of **cartilaginous** and **bony** elements, with **fontanelles** and **sutures** allowing for flexibility and growth. This unique anatomy is essential for accommodating the developing brain and facilitating passage through the birth canal. The **cranial bones** are not fully fused, enabling this necessary flexibility.
**Why the Correct Answer is Right**
Given the incomplete information, a general approach to newborn skull anatomy is necessary. Normally, the correct answer would relate to the characteristics of the newborn skull, such as the presence of **fontanelles**, the flexibility of the skull, or the process of **ossification**. The correct option would be the one that does not align with known facts about the newborn skull.
**Why Each Wrong Option is Incorrect**
**Option A:** Without specific details, it's challenging to address each option directly. However, any option suggesting a fully fused skull or absence of **fontanelles** at birth would be incorrect.
**Option B:** Similarly, an option denying the presence of **sutures** or the cartilaginous nature of some cranial elements at birth would be wrong.
**Option C:** An option stating that the skull is fully ossified at birth would be incorrect, as significant **ossification** occurs postnatally.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the newborn skull has **two fontanelles** (anterior and posterior) which are crucial for brain growth and development. These **fontanelles** typically close by certain ages, with the anterior fontanelle closing around 18-24 months.
**Correct Answer:**