The premature closure of the sagittal suture is called?

AIIMS Raipur NO - 2017 (Shift-1)

Applied Anatomy

Easy

Appeared in: AIIMS Raipur NO - 2017 (Shift-1)

Explanation

Scaphocephaly is the medical term for the condition resulting from the premature fusion of the sagittal suture.
This fusion restricts the skull's growth in width, leading to compensatory growth in the anteroposterior (front-to-back) direction.
The resulting head shape is characteristically long, narrow, and often described as boat-shaped (from the Greek 'skaphe' meaning boat).
It is the most common type of single-suture craniosynostosis.

Option B: Oxycephaly, also known as turricephaly, refers to a tall, cone-shaped head. It is not caused by the isolated fusion of the sagittal suture.
Option C: Acrocephaly is a general term for a 'tower skull' or pointed head, often used interchangeably with oxycephaly. It does not specifically describe the result of sagittal suture fusion.
Option D: Anencephaly is a severe and fatal neural tube defect, not a type of craniosynostosis.

Visual 1: Diagram - An illustration comparing a normal infant skull with a skull showing scaphocephaly. The diagram should clearly label the fused sagittal suture and use arrows to show the restricted lateral growth and compensatory anteroposterior growth.
Visual 2: Table - A chart summarizing the main types of craniosynostosis, listing the fused suture, the name of the deformity (e.g., Scaphocephaly, Brachycephaly, Trigonocephaly), and a simple drawing of the resulting head shape for each.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Craniosynostosis and associated skull deformities as background academic context rather than a clinical decision trigger.
Nurses play a vital role in the early detection of craniosynostosis during routine well-baby check-ups by performing head assessments, including measuring head circumference and observing head shape.
A palpable ridge over a suture line or an abnormal head shape is a key finding that warrants prompt referral to a pediatric neurosurgeon or craniofacial specialist for further evaluation.
Surgical correction is the primary treatment and is typically performed within the first year of life to allow for normal brain growth and minimize cosmetic deformity.

How to Approach the Question

First, identify the key anatomical structure and pathology in the question: 'sagittal suture' and 'premature closure'.
Recognize that premature suture closure is known as craniosynostosis, and different fused sutures result in different, named deformities.
Recall or deduce the function of the sagittal suture, which runs front-to-back down the midline of the skull, allowing for growth in width.
Reason that if this suture closes early, the skull cannot grow wider and must compensate by growing longer (front-to-back).
Evaluate the options based on this understanding. 'Scaphocephaly' (boat-head) matches the description of a long, narrow skull.
Eliminate the other options: Oxycephaly/Acrocephaly refer to a tall/pointed skull (from multiple suture fusions), and Anencephaly is a completely different birth defect involving an absent brain.

Concept Tested & Keywords

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