Trabeculae of corpus spongiosum of penis

Anatomical structure in the human penis

The trabeculae of the corpus spongiosum are a network of connective tissue and smooth muscle fibers found within the corpus spongiosum of the penis. The corpus spongiosum is one of the three erectile tissues of the penis, the others being the paired corpora cavernosa.

Structure

The trabeculae of the corpus spongiosum are composed of a framework of collagen and elastin fibers interspersed with smooth muscle cells. This network forms a spongy tissue that surrounds the urethra, the duct through which urine and semen are expelled from the body.

The trabeculae are arranged in a manner that allows the corpus spongiosum to expand and fill with blood during erection, while also maintaining the patency of the urethra to allow for the passage of semen during ejaculation.

Function

The primary function of the trabeculae of the corpus spongiosum is to support the structure of the corpus spongiosum and facilitate its role in the erectile process. During sexual arousal, the parasympathetic nervous system triggers the relaxation of the smooth muscle within the trabeculae, allowing blood to flow into the vascular spaces of the corpus spongiosum.

Unlike the corpora cavernosa, which become rigid during erection, the corpus spongiosum remains more pliable. This pliability is crucial for maintaining the urethral opening during ejaculation, ensuring that semen can be expelled efficiently.

Clinical significance

Damage or dysfunction of the trabeculae of the corpus spongiosum can lead to erectile dysfunction or other penile disorders. Conditions such as Peyronie's disease may affect the structure and function of the trabeculae, leading to pain or curvature of the penis during erection.

Also see

• Corpus spongiosum
• Corpora cavernosa
• Erection
• Ejaculation
• Peyronie's disease