Male Reproductive System: Penis and parts of the penis

len Alfred Ajibola - Tue, 06th August, 2019 @ 3:30 PM

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Academic Questions in Biology

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Male Reproductive System - Len Academy

From the above diagram, which of the organ below isn't a requirement for the male reproductive system?

  • A. Bladder

  • B. Ureter

  • C. Glans Penis

  • D. Testis

  • E. Bulbourethral Gland

  • F. Epididymis

A walnut shaped male accessory sex organ located between the bladder and penis is the _____.

  • A. Ductus Ejaculatorii

  • B. Bulbourethral Gland

  • C. Prostate Gland

  • D. Ductus Deferens

  • E. Seminal Vesicles

  • F. Epididymis

In a food chain, the primary consumers are classified under trophic level  _____.

  • A. Zero

  • B. One

  • C. Two

  • D. Three

  • E. Four

  • F. Five

Cold blooded animals are referred to as _____.

  • A. Homeotherms

  • B. Endotherms

  • C. Poilokitherms

  • D. Ectotherms

  • E. Thermotherms

  • F. None of the above

All reptiles are vertebrates.

  • A. True

  • B. False

_____ cells are responsible for the formation of osteoblasts.

  • A. Osteocytes
  • B. Chondrocytes
  • C. Chondroblasts
  • D. Osteoclasts
  • E. Osteoprogenitor cells
  • F. Osteoblastic

_____ is a bone that constitute the axial skeleton.

  • A. Clavicle
  • B. Scapula
  • C. Patella
  • D. Radius
  • E. Sternum
  • F. Femur

Which of the following is false concerning cartilages and bones?

  • A. Cartilage does not have a direct blood supply while bones have direct blood supply
  • B. The process of ossification replaces a cartilage to bone
  • C. The protein that makes up cartilage is called chondrin while that that makes up bone is called ossein
  • D. Cartilage grows from both ends while bones grow from one of its epiphysis
  • E. They both have living cells within them
  • F. Haversian system is absent in cartilage but present in bones

Male Reproductive System:

Reproduction is one of the basic characteristics of life. All living organisms have the ability to give birth to offspring or young of the same kind.

Reproduction can be defined as the process through which organisms give birth to their young (offspring) of the same kind.

Please read on the basic characteristics of life here.

Reproduction can be put into two types. These are:

  1. Sexual Reproduction

  2. Asexual Reproduction

In this article, we will focus our attention on the male reproductive system which is a requirement for sexual reproduction.

You can read on sexual reproduction in plants here.

The male reproductive system consists of organs called genitals. The genitals are present both externally and internally.

Reproductive organs present outside the body are generally referred to as external genitalia while those present inside the body are termed internal genitalia.

The male external genitalia consist of the followings:

The male internal genitalia include the followings:

  • Testis
  • Vas Deferens
  • Ejaculatory Duct
  • Seminal Vesicles
  • Prostate Gland
  • Bulbourethral Glands or Cowper’s Gland

The seminal vesicles, prostate gland, bulbourethral glands (Cowper’s glands) are often referred to as accessory organs of reproduction in males.

Please read on the male accessory sex organs here. It will give you a better understanding on the explanations below, especially with those relating to semen.


  • Penis

The penis is a copulatory and intromittent organ required for the male sexual act. It is the ideal organ for introducing sperm into the female’s vagina through a process termed ejaculation.

Note: For ejaculation to occur, orgasm has to take place.

Orgasm is a series of contraction of the muscles present within the penis which ultimately lead to the release of semen.

This process of orgasm and ejaculation is often considered as the climax or peak of the male sexual act.

Below is a diagram of the penis and its divisions:

Penis - Len Academy

Anatomically (or structurally), the penis can be divided into three parts. These are:

1. Root of the Penis: This is the fixed part of the penis and it’s located within a male's body.

Anatomically, the penis commences from within the body, directly below the bulbourethral organs at the pelvic floor.

The root of the penis comprises of two kinds of muscle. These are:

  • Ischiocavernosus Muscle: It helps to produce and maintain erection.
  • Bulbospongiosus Muscle: It assists in the forceful expulsion of semen from the urethra.

2. Body of the Penis: The penile body marks the beginning of the visible part of the penis as it extends from the root to the glans penis.

It is made up of three cylinders of erectile tissues. These are: two corpora cavernosa and one corpus spongiosum. They are shown below:

Muscles of the Penis - Len Academy

It is worthy of note to state that penile erection is a vascular process. In simple terms, it implies that erection in men is achieved as a result of the flow of blood into the corpora cavernosa and corpus spongiosum muscles respectively. On the contrary, lack of adequate blood flow to the penis will result to little or no erection. This condition is medically termed Erectile Dysfunction (ED) or Impotence.

The erectile tissues are highly vascular. In this regard, they can receive a good amount of blood supply. As a result, they play a significant part in the erection of the penis.

You can read on the layers of an artery here.

3. Glans of the Penis: Fondly called the glans penis, it is the expanded and rounded head of the penis. The glans penis contains an opening called urethra around its center.

At birth, the glans is covered by a fold of foreskin called the prepuce. This foreskin is connected by a soft tissue called the frenulum to the neck of the glans.

Often times, the foreskin is removed at birth through a process termed circumcision. Parents who do not circumcise their children should clean their glans penis daily so as to prevent bacteria growth around that region.

You can read on the harmful traditional practices in Nigeria here.

The glans penis contains numerous touch receptors. As a result, it can be very sensitive to touch.

Understand that urine and semen are released from the external urethral orifice. This is the opening present at the tip of the glans.

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Please read on the layers of an artery here

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Plants are also able to live in different habitats because they have the required adaptive features towards that habitat. For instance:

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The point is:

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