**Question:** A 6-month-old boy was born with hypospadias. This condition is due to failure in the development of which of the following:

A. Urethral bud
B. Urethral groove
C. Urethral plate
D. Urethral سبط

**Core Concept:**
Hypospadias is a congenital anomaly in which the urethral opening is located abnormally, typically on the ventral aspect of the penis instead of its normal location at the tip. In this case, the failure in development pertains to the urethral structures responsible for forming the penile urethral opening.

**Why the Correct Answer is Right:**
Hypospadias is primarily due to the failure in the development of the urethral plate (C). This is the embryonic structure that gives rise to the entire urethra, including the penile urethral opening. When the urethral plate fails to develop properly, the urethral opening does not form at the correct location.

**Why Each Wrong Option is Incorrect:**

A. Urethral bud (D) is not directly relevant to hypospadias. While the urethral bud is involved in urethral development, its failure would lead to a completely blind-ended or separate urethra, not the localized defect seen in hypospadias.

B. Urethral groove (A) is not the primary structure affected in hypospadias. The urethral groove forms during embryonic development, but it is the urethral plate that determines the location of the urethral opening.

D. Urethral سبط (B) is not the correct answer. Urethral سبط is a mesenchymal structure that will later differentiate into the corpus spongiosum and urethral sphincters. Its failure would not result in the localized defect seen in hypospadias.

**Clinical Pearl:**
Hypospadias is a complex developmental disorder influenced by multiple genetic and environmental factors. While the correct answer (C) is crucial, understanding the role of other structures like the urethral bud, urethral groove, and urethral سبط can help in grasping the intricacies of urethral development and how these structures interact to form the normal penile urethral opening.

**Correct Answer:** C. Urethral plate