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Gross II Exam 4 > Male External Genitalia > Flashcards

Male External Genitalia Flashcards

1
Q

What are the male external genitalia?

A
  • scrotum

- penis

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2
Q

What is the scrotum?

A

a cutaneous pouch

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3
Q

What does the scrotum contain?

A
  • testes
  • epididymis
  • lower part of the spermatic cord
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4
Q

Where is the scrotum located?

A

behind the penis and below the pubic symphysis

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5
Q

What marks the division of the scrotum into left and right compartments?

A

a median raphe

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6
Q

What is the blood supply to the scrotum?

A
  • external pudendal artery

- posterior scrotal branch of internal pudendal artery

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7
Q

What is the nerve supply to the scrotum?

A
  • anterior scrotal branch of ilioinguinal nerve
  • genital branch of genitofemoral nerve
  • posterior scrotal branch of perineal nerve
  • perineal branch of posterior cutaneous nerve of thigh
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8
Q

What is the penis?

A

the male organ of copulation

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9
Q

What does the penis consist of?

A
  • root

- body

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10
Q

What is the root of the penis?

A
  • the attached, nonmobile portion
  • it lies in the superficial perineal pouch
  • consists of three masses of erectile tissue:
    1. left and right crus of the penis
    2. bulb of the penis
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11
Q

Describe the crura of the penis.

A
  • each originates from the ramus of the corresponding ischium posteriorly
  • each runs forward to join the crus of the contralateral side near the pubic symphysis
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12
Q

What covers the crura of the penis?

A

each is covered by an ischiocavernosus muscle

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13
Q

What do the crura become below the pubic symphysis?

A

the corpora cavernosa of the body of the penis

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14
Q

Describe the bulb of the penis.

A
  • lies between the two crura in the superficial perineal pouch
  • runs forward
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15
Q

What covers the bulb of the penis?

A

covered by the bulbospongiousus muscle

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16
Q

What does the bulb of the penis become below the pubic symphysis?

A

the corpus spongiosum

17
Q

What pierces the posterior portion of the bulb of the penis?

A

the urethra

18
Q

What is the body of the penis?

A
  • the free, pendulous part
  • consists of three cylindrical masses of erectile tissue:
    1. two corpora cavernosa (continuations of the crura)
    2. corpus spongiosum (continuation of the bulb)
19
Q

What do the corpora cavernosa end in?

A

blunt projections

20
Q

What covers the blunt projections of the corpora cavernosa?

A

the glans penis

21
Q

Which is smaller, the corpora cavernosa or the corpus spongiosum?

A

corpus spongiosum

22
Q

What forms the glans penis?

A

the corpus spongiosum expands at the end to form it

23
Q

What does the corpus spongiosum contain?

A

the spongy/penile urethra

24
Q

What is the glans penis?

A

the expanded end of the corpus spongiosum

25
Q

What is the neck of the glans?

A

separates the glans from the rest of the organ

26
Q

What is the corona of the glans?

A

the prominent margin of the glans adjacent to the neck

27
Q

What is the external urethral orifice?

A

a median slit near the tip of the glans

28
Q

What is the prepuce?

A
  • a fold of skin which covers the glans

- removed in circumcision

29
Q

What is the frenulum of the prepuce/glans?

A

a median fold which is attached near the external urethral orifice

30
Q

What are the parts of the urethra?

A
  1. prostatic part (within prostate)
  2. intermediate/membranous part (between prostate and bulb of the penis): surrounded by the external urethral sphincter
  3. spongy/penile part (within the penis): in the corpus spongiosum
  4. fossa navicularis: the expansion near the end
  5. external urethral orifice
31
Q

Describe the superficial fascia of the penis.

A

continuous with the superficial perineal fascia

32
Q

Describe the deep fascia of the penis.

A

continuous with the deep perineal fascia

33
Q

Describe the tunica albuginea of the penis.

A

fibrous layer which encloses both the corpora cavernosa and corpus spongiosum

34
Q

Describe the fundiform ligament of the penis.

A
  • arises from the linea alba and the superficial fascia of the abdomen
  • splits into left and right parts and encircles the body of the penis
35
Q

Describe the suspensory ligament of the penis.

A
  • from the pubic symphysis and arcuate pubic ligament

- lies deep to the fundiform ligament

36
Q

What is the arterial supply to the penis?

A
  • dorsal artery of the penis
  • deep artery of the penis
  • artery of the bulb
  • helicine arteries
37
Q

What is the venous drainage of the penis?

A
  • superficial dorsal vein of the penis

- deep dorsal vein of the penis

38
Q

What is the innervation of the penis?

A
  • dorsal nerve of the penis (from the pudendal nerve)

- cavernous nerves (supply erectile tissue)

Gross II Exam 4 (22 decks)

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