Podcast
Questions and Answers
What is the duration of the indifferent stage of external genitalia development?
What is the duration of the indifferent stage of external genitalia development?
What is the function of the testis in the development of male external genitalia?
What is the function of the testis in the development of male external genitalia?
What forms the dorsal and lateral aspects of the penis?
What forms the dorsal and lateral aspects of the penis?
What appears on the ventral aspect of the developing penis during the development of male external genitalia?
What appears on the ventral aspect of the developing penis during the development of male external genitalia?
Signup and view all the answers
During the indifferent stage, how many elevations form around the urogenital membrane?
During the indifferent stage, how many elevations form around the urogenital membrane?
Signup and view all the answers
What covers the five elevations formed during the indifferent stage?
What covers the five elevations formed during the indifferent stage?
Signup and view all the answers
What is the primary factor that induces the development of male type external genitalia?
What is the primary factor that induces the development of male type external genitalia?
Signup and view all the answers
During the indifferent stage, what is the location of the genital tubercle?
During the indifferent stage, what is the location of the genital tubercle?
Signup and view all the answers
What is the fate of the genital (urethral) folds in the development of male external genitalia?
What is the fate of the genital (urethral) folds in the development of male external genitalia?
Signup and view all the answers
During the indifferent stage, what is the number of genital (labio – scrotal) swellings?
During the indifferent stage, what is the number of genital (labio – scrotal) swellings?
Signup and view all the answers
What is the developmental fate of the mesenchyme around the urogenital membrane?
What is the developmental fate of the mesenchyme around the urogenital membrane?
Signup and view all the answers
During the development of male external genitalia, what forms the dorsal and lateral aspects of the penis?
During the development of male external genitalia, what forms the dorsal and lateral aspects of the penis?
Signup and view all the answers
What is the location of the urethral groove in the developing penis?
What is the location of the urethral groove in the developing penis?
Signup and view all the answers
Study Notes
Development of External Genitalia
- The external genitalia develop under three main stages: indifferent stage, development of male external genitalia, and development of female external genitalia.
Indifferent Stage
- The external genitalia cannot be differentiated into male or female from the 4th to the 7th week of development.
- In the 4th week, the mesenchyme around the urogenital membrane proliferates to produce five elevations, all covered by ectoderm.
- These elevations include:
- A single genital tubercle at the cranial end of the urogenital membrane.
- Right and left urethral (genital) folds on the sides of the urogenital membrane.
- Right and left genital (labio-scrotal) swellings on the sides of the genital folds.
Development of Male External Genitalia
- The undifferentiated external genitalia are switched to form male type external genitalia due to testosterone secretion by the developing testis.
- The genital tubercle elongates to form the phallus, which later develops into the two corpora cavernosa, forming the dorsal and lateral aspects of the penis.
- A longitudinal urethral groove appears on the ventral aspect of the developing penis, bordered by the urethral folds.
Development of External Genitalia
- From the 4th to the 7th week of development, the external genitalia cannot be differentiated into male or female.
Indifferent Stage of External Genitalia
- During the 4th week, the mesenchyme around the urogenital membrane proliferates to produce five elevations, all covered by ectoderm.
- The five elevations include:
- A single genital tubercle at the cranial end of the urogenital membrane.
- Right and left urethral (genital) folds on the sides of the urogenital membrane.
- Right and left genital (labio – scrotal) swellings on the sides of the genital folds.
Development of Male External Genitalia
- The undifferentiated external genitalia are switched to form male type external genitalia due to the secretion of testosterone by the developing testis.
- Key developments include:
- Elongation of the genital tubercle to form the phallus, which later develops into the two corpora cavernosa, forming the dorsal and lateral aspects of the penis.
- The formation of a longitudinal urethral groove on the ventral aspect of the developing penis, bordered by the urethral folds.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Learn about the indifferent stage of external genitalia development, and how male and female external genitalia develop in the 4th to 7th week of embryonic development.
