Genitals

Question 1

What 3 structures compose the indifferent genitalia around weeks 4-7?

Answer 1

Genital tubercle (formed on cloacal membrane)
Labioscrotal swellings and Urogenital folds  (lateral to tubercle)

Question 2

The genital tubercle elongates to form the ____ ____.

Answer 2

Primordial phallus

Question 3

The primordial phallus eventually becomes what?

Answer 3

Glans penis or clitoris

Question 4

What hormone causes masculinization of the primordial phallus?

Answer 4

DHT

Question 5

The urogenital folds move to surround the ____ ____ (endoderm), except at the future site of the penile raphe, which creates a urethral groove.

Answer 5

Urethral plate

Question 6

The fusing of the urogenital folds and subsequent tubularization of the urethral plate/groove forms the ___ ___.

Answer 6

Spongy urethra

Question 7

The surrounding layer of the urogenital folds (ectoderm; penile skin) fuses to form what external landmark?

Answer 7

Penile raphe

Question 8

Around 11 weeks, the ___ ___ at the glans penis forms to travel proximally and join the spongy urethra. This forms the ___ ___.

Answer 8

The ectodermal cord of the glans moves proximally and forms the fossa navicularis/urethral meatus.

Question 9

If the ectodermal cord does not meet the spongy urethra, a ____ develops.

Answer 9

Hypospadias

Question 10

Which structure of the indifferent genitalia fuses together to form the scrotum?

Answer 10

Labioscrotal swellings

Question 11

If a hemiscrotum is hypoplastic, an ___ ___ is likely present.

Answer 11

Undescended testicle.

Question 12

Feminization of the primordial phallus via ____ forms the ____.

Answer 12

Estrogens; clitoris

Question 13

In females, the urogenital folds only fold posteriorly, resulting in unfused portions becoming the ___ ___.

Answer 13

Labia minora

Question 14

The labioscrotal folds in females fuse posteriorly and anteriorly (makes the mons pubis and labial commisures) with unfused portions becoming the ___ ___

Answer 14

Labia majora