How many fontanels are present in newborn :

Appeared in: RRB Staff Nurse Ahmedabad-2015

Explanation

A newborn has six fontanels anatomically: one anterior, one posterior, two sphenoid, and two mastoid.
However, only two of these are of obstetrical and clinical importance: the anterior and posterior fontanels.
Nursing and medical assessments focus on these two primary fontanels.
Since 'Six' is not an option, the question is implicitly asking for the number of clinically significant fontanels.
The anterior fontanel is diamond-shaped and closes by 12-18 months.
The posterior fontanel is triangular and closes by 6-8 weeks.

Option B: This is an incorrect count. There is no standard anatomical or clinical classification that results in three fontanels.
Option C: This is an incorrect count. There is no standard anatomical or clinical classification that results in five fontanels.
Option D: While there are four types of fontanels (anterior, posterior, sphenoid, mastoid), the total number is six because the sphenoid and mastoid fontanels are paired. This option is an incorrect count.

Visual 1: Diagram - An illustration of a newborn's skull from a superior and lateral view, clearly labeling all six fontanels (anterior, posterior, two sphenoid, two mastoid) and highlighting the two clinically significant ones (anterior and posterior).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the newborn skull and the clinical significance of fontanels as background academic context rather than a clinical decision trigger.
Assessing fontanels is a critical nursing skill in pediatrics. A sunken fontanel is a late and serious sign of dehydration, requiring immediate fluid resuscitation.
A bulging, tense fontanel is a red flag for increased intracranial pressure (ICP) and constitutes a medical emergency, potentially indicating meningitis, hydrocephalus, or intracranial hemorrhage.
During labor, palpating the fontanels helps determine the position and degree of flexion of the fetal head.

How to Approach the Question

First, identify the core of the question, which is asking for the number of fontanels in a newborn.
Recall the anatomical facts about the fetal skull. There are a total of six fontanels: 1 anterior, 1 posterior, 2 sphenoid, and 2 mastoid.
Next, carefully examine the given options: Two, Three, Five, Four.
Notice that the anatomical number 'Six' is not an option. This is a common test-taking clue that the question is likely asking for a specific subset, such as the clinically significant fontanels.
Recall that in a clinical and obstetrical context, only the anterior and posterior fontanels are routinely assessed and considered significant.
Therefore, the most appropriate answer from the choices provided is 'Two'.

Concept Tested & Keywords

Concept Tested: Anatomy of the newborn skull and the clinical significance of fontanels.
Stem keywords: fontanels, newborn
Lead-in keywords: How many

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