Which is the thickest layer of uterus?

Appeared in: RRB Nsg. Superintendent 21 July 2019 (shift 1st)

Explanation

The myometrium is the middle and thickest layer of the uterine wall, measuring approximately 12-15 mm.
It is composed of strong, smooth muscle fibers arranged in bundles.
Its primary function is to generate the powerful contractions necessary for childbirth (labor) and to expel the menstrual lining.
The thickness and muscular nature of the myometrium are directly related to its function of expulsion.

Option A: The endometrium is the innermost mucosal lining of the uterus. Although its thickness varies cyclically, it is substantially thinner than the myometrium.
Option B: The perimetrium is the outermost layer of the uterus. It is a thin, serous membrane, essentially a part of the visceral peritoneum, making it the thinnest layer.
Option D: Exometrium is not a recognized anatomical term for any of the layers of the uterine wall. The standard terms are perimetrium, myometrium, and endometrium.

Visual 1: Diagram - A cross-section of the uterus clearly labeling the three layers: the thin outer perimetrium, the thick middle myometrium, and the inner endometrium. This helps visualize their relative thickness and position.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the uterine wall layers as background academic context rather than a clinical decision trigger.
The myometrium's ability to contract is fundamental to obstetrics. Uterotonic drugs like Oxytocin are administered to induce or augment labor by stimulating myometrial contractions.
Uterine fibroids (leiomyomas), a common benign tumor in women of reproductive age, originate from the smooth muscle cells of the myometrium.
Atony, or the failure of the myometrium to contract adequately after childbirth, is a leading cause of postpartum hemorrhage, a life-threatening condition.

How to Approach the Question

This is a factual recall question from the subject of anatomy.
Identify the core of the question: it asks to identify the 'thickest layer' of the 'uterus'.
Mentally list the three layers of the uterine wall: Perimetrium (outer), Myometrium (middle), and Endometrium (inner).
Recall the composition of each layer. The prefix 'myo-' means muscle. The myometrium is the muscular layer.
Logically deduce that the muscular layer responsible for powerful contractions during childbirth must be the thickest and strongest.
Evaluate the given options against your anatomical knowledge. Eliminate 'Exometrium' as an incorrect term. Compare the known characteristics of the remaining three layers to determine that the myometrium is the thickest.

Concept Tested & Keywords

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Practise the full RRB Nsg. Superintendent 21 July 2019 (shift 1st)

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