Which one of the following pairs regarding presentation and presenting part in women during labor is not correct?

Appeared in: BHU NO - 2015

Explanation

The pair 'Cephalic presentation - Chin' is incorrect.
Cephalic presentation refers to any presentation where the fetal head is the leading part.
The most common type of cephalic presentation is the vertex (or occiput) presentation, where the head is fully flexed and the occiput (back of the head) is the presenting part.
The chin (mentum) is the presenting landmark specifically in a face presentation, which is a less common type of cephalic presentation, but it is not the presenting part for all cephalic presentations.

Option B: This pair is correct. In a face presentation, the fetal head is hyperextended, causing the face to be the part that enters the birth canal first.
Option C: This pair is correct. In a transverse lie, the fetus is positioned horizontally across the uterus, and the shoulder is typically the presenting part.
Option D: This pair is correct. In a breech presentation, the fetal buttocks (or feet) are the presenting part. The buttock is the specific presenting part in a frank or complete breech.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Fetal presentation and presenting parts during labor as background academic context rather than a clinical decision trigger.
Accurate identification of fetal presentation and the presenting part is a critical nursing skill during labor assessment.
It determines the feasibility of vaginal delivery and helps anticipate potential complications (dystocia).
Malpresentations like face, brow, breech, or transverse lie often require specific management strategies, including manual rotation, operative vaginal delivery, or cesarean section, to ensure maternal and fetal safety.

How to Approach the Question

First, understand the question is asking for the INCORRECT pair. This means you need to find the one statement that is factually wrong.
Define the key terms: 'presentation' (which part of the fetus is in the lower uterine segment) and 'presenting part' (the specific part of the presentation felt on vaginal exam).
Evaluate each option pair based on standard obstetrical definitions.
Option A: Cephalic presentation. Is the chin always the presenting part? Recall that vertex (occiput) is the most common cephalic presentation.
Option B: Face presentation. Is the face the presenting part? Yes, by definition.
Option C: Transverse presentation. Is the shoulder the presenting part? Yes, by definition.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 19-36

Practise the full BHU NO - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.