Organ
Tunica albuginea of the testis
The fibrous capsule and internal framework of the testis
High-yield
The albuginea is the testis's structural capsule; tunica vaginalis is the surrounding serous covering. Disruption of the capsule after trauma is the defining anatomical feature of testicular rupture.
Overview
A strong connective-tissue capsule surrounds the testicular parenchyma beneath its serous covering. It thickens posteriorly into the mediastinum and connects with septa that organize the lobules. Vessels and collecting ducts converge in this posterior framework, while a vascular layer lies against the capsule's inner surface.
Reference facts
- Location
- It directly encloses the testicular tissue, deep to the visceral vaginalis over most surfaces, and forms the thicker posterior mediastinum.
- Parts
- The outer fibrous envelope, posterior mediastinum and connecting septa create a supporting framework around and between the testicular lobules.
- Blood supply
- Subcapsular branches of the testicular vessels form the tunica vasculosa along its inner aspect and communicate with vessels in the septa.
- Innervation
- Testicular visceral sensory fibers travel with the gonadal neurovascular pathways toward lower thoracic spinal segments.
- Relations
- The serous covering reflects away near the posterior attachment region, where the epididymis, ducts and vessels are closely related to the capsule.
- Function
- The capsule maintains the organ's form and provides attachment for septa that organize its vessels and sperm-producing tissue.
Clinical correlation
Blunt injury can tear the capsule and allow testicular tissue to protrude, sometimes with impaired perfusion. The relatively resistant capsule also limits expansion during severe swelling. Pain in inflammation or torsion has multiple contributors, including ischemia and tissue inflammation, rather than one universal pressure mechanism.
Frequently asked questions
Where is the tunica albuginea of the testis located?
It directly encloses the testicular tissue, deep to the visceral vaginalis over most surfaces, and forms the thicker posterior mediastinum.
What does the tunica albuginea of the testis do?
The capsule maintains the organ's form and provides attachment for septa that organize its vessels and sperm-producing tissue.
What are the parts of the tunica albuginea of the testis?
The outer fibrous envelope, posterior mediastinum and connecting septa create a supporting framework around and between the testicular lobules.
What is the blood supply of the tunica albuginea of the testis?
Subcapsular branches of the testicular vessels form the tunica vasculosa along its inner aspect and communicate with vessels in the septa.