Anatomy and Physiology II Practice Test 2025 - Free Anatomy Practice Questions and Study Guide

Question: 1 / 400

The penis contains three columns of erectile tissue. What are the names of the two larger columns?

Corpora cavernosa

The two larger columns of erectile tissue in the penis are known as the corpora cavernosa. These structures are crucial for erectile function; they become engorged with blood during sexual arousal, leading to an erection. The corpora cavernosa are located dorsally and make up the bulk of the penis.

In addition to the corpora cavernosa, the penis also contains the corpus spongiosum, which surrounds the urethra. While this structure is essential for protecting the urethra and facilitating ejaculation, it is larger in cross-sectional area primarily at the head or glans of the penis rather than along its length. The other options, such as vascular sinuses and bulbospongiosus, relate to blood flow and muscle function, respectively, but they do not represent the larger columns of erectile tissue. Understanding this anatomical arrangement is essential for grasping how the penis functions in both erection and sexual activity.

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Corpus spongiosum

Vascular sinuses

Bulbospongiosus

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