By What Age Does the Posterior Fontanel Usually Close

question 26

Multiple Choice

By what age does the posterior fontanel usually close?

• A) 6 to 8 weeks
• B) 10 to 12 weeks
• C) 4 to 6 months
• D) 8 to 10 months

---

Definitions:

Estrogens

A group of steroid hormones that play a key role in the development and regulation of female reproductive system and secondary sexual characteristics.

Sexual Differentiation

The process by which the differences between males and females are established, guided by genetic, hormonal, and environmental factors.

Prenatal Development

The process of growth and development within the womb from conception to birth.

Hormones

Chemical messengers produced by glands in the body, coordinating and regulating the activities of various cells and organs.