External Genitalia (Penis and Scrotum)
Describes the structure and function of the penis and scrotum in the male reproductive system.
What is External Genitalia (Penis and Scrotum)?
The male external reproductive organ, composed of erectile tissue and serving for urination and copulation.
Key points
- Describe the structure and function of the penis.
- Explain the role of the scrotum in thermoregulation for spermatogenesis.
- Identify the erectile tissues within the penis.
- Understand the passage of the urethra through the penis.
Common exam trap
Confusing the functions of corpora cavernosa and corpus spongiosum.
Definitions
- Term
Penis
- Meaning
The male external reproductive organ, composed of erectile tissue and serving for urination and copulation.
- Term
Scrotum
- Meaning
A sac of skin hanging from the body below the penis, containing the testes.
- Term
Corpora Cavernosa
- Meaning
Two columns of erectile tissue forming the dorsal part of the penis, which engorge with blood during erection.
- Term
Corpus Spongiosum
- Meaning
A column of erectile tissue surrounding the urethra, forming the glans penis, which prevents urethral compression during erection.
- Term
Glans Penis
- Meaning
The sensitive tip of the penis, formed by the expanded corpus spongiosum.
- Term
Prepuce
- Meaning
A fold of skin covering the glans penis, also known as the foreskin.
- Term
Dartos Muscle
- Meaning
A layer of smooth muscle in the scrotal wall that contracts to wrinkle the scrotal skin and reduce heat loss.
- Term
Cremaster Muscle
- Meaning
A muscle that surrounds the spermatic cord and contracts to elevate the testes closer to the body for warmth.
Learning objectives
Describe the structure and function of the penis.
Explain the role of the scrotum in thermoregulation for spermatogenesis.
Identify the erectile tissues within the penis.
Understand the passage of the urethra through the penis.
Prerequisites
Basic understanding of the male reproductive system.
Knowledge of the functions of the testes.
Common mistakes
Confusing the functions of corpora cavernosa and corpus spongiosum.
Not understanding the physiological importance of the scrotum's external location for temperature regulation.
Incorrectly identifying the path of the urethra within the penis.
Keywords
Penis
Scrotum
Erectile Tissue
Corpora Cavernosa
Corpus Spongiosum
Glans Penis
Prepuce
Urethra
Spermatogenesis
Thermoregulation
Dartos Muscle
Cremaster Muscle
Practice preview
Which of the following is the primary function of the scrotum?…
easy
The penis is primarily composed of erectile tissue. What is the main function of this erectile tissue?…
easy
Which structure surrounds the urethra within the penis and prevents it from compressing during erection?…
easy