An urologist, for a case of erectile dysfunction, decides a direct injection of prostaglandin E1 into the penis. Injection is generally performed directly into the corpus cavernosum. During the procedure, the needle would pass through which of the following layers in order
An urologist, for a case of erectile dysfunction, decides a direct injection of prostaglandin E1 into the penis. Injection is generally performed directly into the corpus cavernosum. During the procedure, the needle would pass through which of the following layers in order
💡 Explanation
## Core Concept
The question tests knowledge of penile anatomy, specifically the layers that a needle would pass through during an intracavernosal injection of prostaglandin E1 for erectile dysfunction. The procedure involves injecting directly into the corpus cavernosum.
## Why the Correct Answer is Right
The correct sequence of layers that the needle would pass through during an intracavernosal injection into the corpus cavernosum includes:
- Skin
- Dartos fascia (or superficial fascia)
- Tunica albuginea (the tough fibrous layer covering the corpora cavernosa)
The correct order reflects the anatomical structure of the penis. The skin is the outermost layer, followed by the dartos fascia, and then the tunica albuginea, which directly surrounds the corpus cavernosum.
## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately represent the sequence of layers that the needle would pass through to reach the corpus cavernosum.
- **Option B:** This option is incorrect as it inaccurately lists the order of layers; specifically, it might incorrectly place the layers or omit crucial ones.
- **Option D:** This option is incorrect because, similar to options A and B, it does not accurately describe the correct sequence of anatomical layers.
## Clinical Pearl / High-Yield Fact
A key point to remember is that the injection for erectile dysfunction using prostaglandin E1 is directly into the corpus cavernosum, and understanding the penile anatomy is crucial to avoid complications. The procedure requires precise technique to ensure efficacy and minimize risks such as priapism or infection.