🔬
Foundation Sciences · Embryology
Gonadal Differentiation
Gonadal sex is determined by the SRY gene on the Y chromosome; absence of SRY leads to ovarian development.
📌 Learning Objectives
- Describe the underlying mechanism of Gonadal Differentiation.
- Identify the key clinical features and complications of Gonadal Differentiation.
- Outline the appropriate investigations and management of Gonadal Differentiation.
- Discuss the implications for patients and families of Gonadal Differentiation.
📋 Overview
Indifferent gonads form by week 6. SRY (sex-determining region Y) triggers testis differentiation, producing testosterone (Leydig) and anti-Müllerian hormone (Sertoli). Without SRY, ovaries develop and Müllerian ducts persist.
🔬 Basic Science
Indifferent gonads form by week 6. SRY (sex-determining region Y) triggers testis differentiation, producing testosterone (Leydig) and anti-Müllerian hormone (Sertoli). Without SRY, ovaries develop and Müllerian ducts persist.
🏥 Clinical Relevance
Early recognition of CAH prevents salt-wasting crises in neonates.
🧪 Investigations
Investigation depends on clinical context: relevant blood tests, imaging, and specific genetic or histopathological tests as appropriate. Refer to specialist services where indicated.
💊 Management
Management is condition-specific and typically multidisciplinary, combining medical therapy, surgical intervention where appropriate, supportive care, and family/genetic counselling.
Revision Resources – expand the sections below for high-yield notes, exam pearls, key facts and further reading.
MLA High-Yield Notes & Quick Revision ⌄
Common SBA themes: recognising the underlying mechanism, identifying classic clinical features, and choosing the first-line investigation or management step. Watch for inheritance pattern and characteristic associations.
sry
gonadal development
amh
wolffian
mullerian
- SRY on Yp11 triggers testis determination.
- Anti-Müllerian hormone causes regression of the paramesonephric (Müllerian) ducts.
- Wolffian (mesonephric) ducts form the epididymis, vas deferens and seminal vesicles.
- Müllerian ducts form the fallopian tubes, uterus and upper vagina.
- Complete androgen insensitivity produces 46,XY females with intra-abdominal testes.
Exam Pearls ⌄
⭐ High Yield
SRY on Yp11 triggers testis determination.
Anti-Müllerian hormone causes regression of the paramesonephric (Müllerian) ducts.
Wolffian (mesonephric) ducts form the epididymis, vas deferens and seminal vesicles.
Müllerian ducts form the fallopian tubes, uterus and upper vagina.
Complete androgen insensitivity produces 46,XY females with intra-abdominal testes.
💡 Clinical Pearl
Sry: Early recognition of CAH prevents salt-wasting crises in neonates.
⚠️ Exam Tip — Common Mistakes
Confusing the mechanism of Gonadal Differentiation with related conditions.
Missing classic clinical features of Gonadal Differentiation in SBA stems.
Failing to consider Gonadal Differentiation in the differential diagnosis.
Key Facts ⌄
SRY on Yp11 triggers testis determination.
Anti-Müllerian hormone causes regression of the paramesonephric (Müllerian) ducts.
Wolffian (mesonephric) ducts form the epididymis, vas deferens and seminal vesicles.
Müllerian ducts form the fallopian tubes, uterus and upper vagina.
Complete androgen insensitivity produces 46,XY females with intra-abdominal testes.
Related Topics ⌄
References ⌄
- GMC MLA Content Map
- NICE Clinical Knowledge Summaries
- BMJ Best Practice
Further Resources
Medical Portfolio & Career Development
Build a professional portfolio website for applications, audits, teaching, research and career progression.
CVtoWebsite.com →