**Question:** On per vaginal examination, anterior fontanelle and supraorbital ridge is felt in the second stage of labour. The presentation is:

A. Occipital Plane
B. Occipito-Posterior
C. Occipito-Anterior
D. Transverse

**Correct Answer:**

**Core Concept:** In human obstetrics, the fetal presentation refers to the way the fetal head is positioned relative to the mother's pelvis during childbirth. There are three primary presentations: occipito-anterior (OA), occipito-posterior (OP), and occipito-transverse (OT). Anterior fontanelle and supraorbital ridge can be felt in the second stage of labour when the presenting part is OA or OP.

**Why the Correct Answer is Right:** The correct answer, "Occipito-Anterior" (OA) or "Occipito-Posterior" (OP), refers to a specific fetal position where the occipital fontanelle (the fontanelle is a soft spot on a baby's head) and supraorbital ridge (a ridge on the forehead) are palpable in the second stage of labor. This positioning allows for a smooth delivery of the head through the mother's pelvis.

**Why Each Wrong Option is Incorrect:**

A. Occipital Plane: This option is incorrect because the occipital plane refers to the plane on which the fetal head lies during labor, not the fetal position relative to the mother's pelvis.

B. Transverse: The fetal head can be transverse in the second stage of labor, but the correct answer should specifically mention the anterior fontanelle and supraorbital ridge palpable, which is not the case with the transverse presentation.

C. Occipito-Transverse: This option is incorrect because the occipito-transverse presentation doesn't involve palpation of the anterior fontanelle and supraorbital ridge in the second stage of labor, making it the wrong answer.

**Clinical Pearls:**

1. Palpation of the anterior fontanelle and supraorbital ridge during the second stage of labor can help determine the fetal presentation.
2. Knowledge of fetal presentations is crucial for safe delivery and avoiding complications like dystocia (difficult labor), malpresentation, and fetal distress.
3. Learning fetal presentations enables healthcare professionals to assess and manage the labor appropriately, ensuring a smooth and safe delivery for both mother and baby.