Where Is The Shaft of the Penis and Its Function?

Penis is an external organ in the male body that is a part of both the reproductive and urinary systems. The role of the penis in reproduction is to deliver the sperm into the female body during intercourse [1]. Once inside, the pathway of sperm in female involves traveling through the cervix, uterus, and fallopian tubes in search of an egg. The urinary role of the penis involves the expulsion of urine from the bladder to the outside of the body [2].

The penis has different parts, and each part has a specific role in the functioning of the penis. The parts of the penis include the glans, shaft, and root. In this article, we will understand where is the shaft, glans, and root of the penis located and what their roles are in penis function.

What Is the Penis?

The penis is a complex external organ present just above the testes. It is a vital organ for the reproductive and urinary system. The shape of the man penis is specially designed to perform the reproductive role.

When you receive sexual stimuli, the soft tissues in the penis fill with blood, and the penis gets an erection [3]. This erection makes the delivery of man sperm into the woman's body possible.

The urinary role of the penis is comparatively simple as it just involves serving a passage for the excretion of urine.

Anatomy of the Penis

The penis parts can be divided anatomically into three main areas. These are:

Glans (Head): The glans, also commonly known as the head, is the rounded tip of the penis. It contains sensory nerves, making it highly sensitive and important for sexual pleasure [4]. The urethral opening is also present on the glans through where the urine comes out from the body.
Shaft (Body): The long parts of a penis between the glans and the base is called the penis shaft or penis body [5]. It is the part that fills with blood and gets an erection, providing structural support to the penis for reproduction.
Root: The root is the lowermost parts of penis that anchors the penis shaft to the pelvis area. It serves as a support and allows the movement of the penis.

Structure of the Penis Shaft

The shaft part of a body is structurally and functionally a vital part of the penis. Penis body holds the penis in its elongated shape, making it essential for erections and sexual function.

Here are some components in the structure of the penis body:

Tissues in the Shaft: The penile body comprises two types of tissue – the corpus cavernosum and the corpus spongiosum [6]. The corpus cavernosum is the tissue present at the top of the shaft.

On the other hand, corpus spongiosum is present around the bottom area, surrounding the urethra. These tissues serve as a reservoir for blood during an episode of sexual stimuli, causing an erection and making penis sex possible [3].

Blood Vessels and Nerves: The penis body contains many blood vessels and nerves that help it perform its functions. Blood vessels enable blood flow into the shaft's tissue during an erection. The nerves transfer physical stimulations to the brain, contributing to sexual pleasure and response.
Skin and Flexibility: The soft tissues in the shaft are surrounded by the fold of skin outside, which allows the contraction and expansion of the penis. Skin that covers the soft tissues also has nerve endings that enhance sexual experience.

Role of the Shaft in Reproduction

The penis shaft has a central role in sexual function and reproductive processes. Here is how the penis body helps in penis function and makes the reproduction process possible:

Erections: A penis erects due to the tissues in the penis body. When you experience sexual arousal, blood fills the tissues in the shaft, causing the shaft to become stiff and elongated [3]. This erection is essential for penetration during sexual intercourse, making it possible to deliver male sperm.
Sperm Delivery: The shaft's structure directs sperm through the urethra during ejaculation. The urethra is a tube that runs through the shaft and carries the sperm outside the body when a man reaches orgasm. Understanding the differences between fertile vs infertile sperm is essential, as sperm quality can significantly impact the chances of successful conception.
Sexual Sensation: The shaft contains many nerve endings and contributes to enhanced sexual experience. These sensations are an important part of the sexual activity, helping create emotional and physical intimacy.

Conclusion

Penis is the primary male reproductive organ and is located just above the testes, outside the body. It comprises three main parts, which are the glans, shaft, and roots. People who are new to the male reproductive anatomy can ask where is the shaft of the penis present and what its role is in reproduction.

The Penis body is the long area between the tip and the root of the man penis. It contains tissues that fill with blood to cause an erection, as well as blood vessels and nerves. The penis shaft helps deliver sperm into the female body during intercourse and enhances the sexual experience because of the presence of nerve endings on the shaft.

FAQs

What are the organs in male public area anatomy?

The organs in the male pubic area anatomy or male reproductive system include the penis, testes, seminal vesicles, vas deferens, and prostate gland.

How does penis shaft contribute to erection?

The penis body contains soft tissues or erectile tissues that fill with blood and help maintain an erection. This role of penis body is important for sexual activity.

How do you experience sensations during sexual activity?

You can experience a sensation of pleasure during sexual activity due to the nerves present on the skin of the penis covering the glans and the body.

Resources Used

Institute for Quality and Efficiency in Health Care (IQWiG). (2022c, May 18). In brief: What do the male sex organs do? InformedHealth.org - NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK525757/
Flores, J. L., Cortes, G. A., & Leslie, S. W. (2023, September 13). Physiology, Urination. StatPearls - NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK562181/
Panchatsharam, P. K., Durland, J., & Zito, P. M. (2023c, May 1). Physiology, Erection. StatPearls - NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK513278/
Sam, P., & LaGrange, C. A. (2023b, July 24). Anatomy, Abdomen and Pelvis, Penis. StatPearls - NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK482236/
Wei, L., Zheng, L., Jiang, H., & Jiang, T. (2024). Differences between the glans and shaft of the penis: a review. Sexual Medicine Reviews. https://doi.org/10.1093/sxmrev/qeae019
Penile Anatomy-Detailed: Image Details - NCI Visuals Online. (n.d.). https://visualsonline.cancer.gov/details.cfm?imageid=11321