Final answer:
The penile fascia that contains the major vessels and nerves is Buck's fascia, a deep layer covering the corpora cavernosa and corpus spongiosum crucial for maintaining an erection and sexual function.
Step-by-step explanation:
The penile fascia that contains major vessels and nerves is A) Buck's fascia. Buck's fascia is a deep fascial layer that encases the corpora cavernosa and the corpus spongiosum. It plays a crucial role in the wang structure as it holds important neurovascular structures that contribute to an erection.
During sexual arousal, the erectile tissue within the wang, called the corpora cavernosa and corpus spongiosum, become engorged with blood. This engorgement compresses the penile veins and venules, maintaining the erection by restricting blood outflow. The sensitivity of the glans wang, provided by the dense concentration of nerve endings, is essential for sexual pleasure and the likelihood of ejaculation.
Buck's fascia is crucial in containing the blood within the corpora cavernosa during an erection and protecting the underlying structures. The other options, Dartos, Scarpa's, and Colles' fascia, are associated with different anatomical regions and do not serve the same function as Buck's fascia in the wang.