urethra (male & female)

Question 1

4 main parts of male urethra

Answer 1

• Preprostatic
• prostatic (widest/ most dilatable)
• Membranous (shortest)
• Penile/ spongy (longest)

Question 2

total length of male urethra

Answer 2

18-20 cm

Question 3

Length of Male preprostatic urethra

Answer 3

1-1.5 cm

Question 4

Length of Male prostatic urethra

Answer 4

3-4 cm Long (most dilatable/ widest)

Question 5

Length of Male membranous urethra

Answer 5

1.5 cm (shortest)

Question 6

Length of Male Penile/spongy urethra

Answer 6

15cm long (longest)

Question 7

shape of male urethra from lateral view

Answer 7

S shaped/ double curve

Question 8

Male urthera extends from ____ to ____

Answer 8

from Internal urethral orifice from bladder to external urethral orifice of penis

Question 9

explain importance of smooth muscles surrounding preprostatic urethra

Answer 9

to form preprostatic sphincter:
prevents ejacultory retrograde into bladder

Question 10

describe features of posterior wall of prostatic urethra

Answer 10

• Urethral crest: longituidal fusiform median ridge
• Prostatic sinus: groove on each side of urethral crest recieving prostatic duct opening
• Seminal colliculus: elevation of urethral crest showing 3 openings:
  1.Prostatic utricle: small pouch from median lobe of prostate
  2.Two ejaculatory ducts on each side of the urethral crest

Question 11

in formation of prostatic utricle, Median lobe of Prostate homologues to ____ in females

Answer 11

Uterus

Question 12

Course of membranous urethra of male

Answer 12

1. Begins at lower part of prostate (cont. of prostatic urethra)
2. passes downwards & forewards in deep perineal pouch, laying between 2 membranes: Pelvic fascia above & perineal membrane below
3. Becomes surrounded by Sphincter urethrae, to end in bulb of penis as Penile urethra

Question 13

site of bulbourethral glands

Answer 13

on the sides of membranous urethra

Question 14

Bulbourethral glands open in :

Answer 14

Penile/spongy urethra:
* by first piercing perineal membrane

Question 15

Narrowest part of the whole urethra

Answer 15

external Urethral meatus

Question 16

Dilatations of Penile urethra

Answer 16

• Intra-bulbar fossa (in bulb): recieving Bulbourethral gland ducts
• Navicular fossa (in glans): with small recess called lacuna magna lying in the rood of the fossa

Question 17

Sphincters of the Male urethra

Answer 17

Internal: Involuntary, at beginning of urethra, controlled by autonomic fibers
External: voluntary, at the membranous urethra, controlled by perineal br. of pudendal N

Question 18

female urethra opens in:

Answer 18

Vestibule, immediately in front of vaginal opening, 1 inch behind clitoris

Question 19

glands of female urethra

Answer 19

Skene’s glands (2 small paraurethral glands): open in lateral margin of external urethral orifice of female