Urethra

Question 1

Anterior urethra begins at the ___

Posterior urethra begins at the

Answer 1

The anterior urethra begins at the perineal membrane and continues distally to the urethral meatus. The posterior urethra begins distal to the bladder neck and the transition to the anterior urethra is made at the perineal membrane.

Question 2

Urethral epithelium is

Answer 2

Transitional until becoming squamous at the glans

Question 3

___ drains into the urethral lumen

Answer 3

Glands of littre

Question 4

ARterial supply

Answer 4

Internal pudendal – > bulbourethral branches

Question 5

venous

Answer 5

pudendal plexus –> internal pudendal

Question 6

lymph

Answer 6

internal iliac –> common iliac

Question 7

Prostatic urethra
The ___ is formed by the widening of the urethral crest from the posterio wall. The ___ orifice appears like a slit at the apex of the ___

Answer 7

verumontanum, prostatic utricles, verum

Question 8

membranous urethra
Measures ___, ends in the ___
has ___ muscle which is supplied by (nerve) and (Plexus)
Autonomic sensation –>

Answer 8

2 to 2.5 cm in length, perineal membrane, This signet ring– shaped striated sphincter , pudendal, sacral plexus

cavernous nerves provide autonomic sensation

Question 9

The penile urethra, also known as the ___ and the ___ urethra, as it is surrounded by the ___, makes up the urethra distal to the membranous urethra. The urethra is often subdivided even further at the junction of the membranous and penile urethra and is termed the ____ urethra. This region comprises a ___ length of urethra within the urogenital diaphragm as well as being within the striated urethral sphincter and the first few proximal centimeters of the bulbous urethra, just distal to the sphincter within the penile bulb.

Answer 9

The penile urethra, also known as the pendulous urethra and the spongy urethra, as it is surrounded by the corpus spongiosum, makes up the urethra distal to the membranous urethra. The urethra is often subdivided even further at the junction of the membranous and penile urethra and is termed the bulbomembranous urethra. This region comprises a 2-cm length of urethra within the urogenital diaphragm as well as being within the striated urethral sphincter and the first few proximal centimeters of the bulbous urethra, just distal to the sphincter within the penile bulb.

Question 10

The ___ urethra begins a few centimeters distal to the membranous urethra and extends distally to the level of the ____. The lumen widens to form the ___. The bulbourethral glands, also known as ____, empty into this region at the ___ o’clock and ___ o’clock positions.

Answer 10

The bulbospongy urethra begins a few centimeters distal to the membranous urethra and extends distally to the level of the suspensory ligament. The lumen widens to form the urethral bulb. The bulbourethral glands, also known as Cowper glands, empty into this region at the three o’clock and nine o’clock positions.

Question 11

The bulbourethral glands are located more proximally on either side of the membranous urethra. The penile urethra measures approximately ___ in length in its entirety from the suspensory ligament to the meatus. It is positioned more dorsally than ventrally within the corpus spongiosum. The bulb and the fossa navicularis are the two segments of urethral lumen ____; otherwise the luminal diameter is relatively consistent throughout. The mucosa of the penile urethra includes a ____ until it reaches the fossa navicularis. The muscle layer is made up of an inner ___, a middle ____, and an inconsistently characterized outer ____.

Answer 11

The bulbourethral glands are located more proximally on either side of the membranous urethra. The penile urethra measures approximately 15 cm in length in its entirety from the suspensory ligament to the meatus. It is positioned more dorsally than ventrally within the corpus spongiosum. The bulb and the fossa navicularis are the two segments of urethral lumen widening; otherwise the luminal diameter is relatively consistent throughout. The mucosa of the penile urethra includes a transitional epithelium until it reaches the fossa navicularis. The muscle layer is made up of an inner longitudinal, a middle circular, and an inconsistently characterized outer longitudinal stratum.

Question 12

The _____ are composed of small, mucus-secreting cells that lubricate the urethra before ejaculation, and they empty into orifices on the posterior wall of the penile urethra.
The ____ are rich in goblet cells and enter the spongy tissue between the vascular spaces and the trabeculae.

Answer 12

The glands of Littre are composed of small, mucus-secreting cells that lubricate the urethra before ejaculation, and they empty into orifices on the posterior wall of the penile urethra.
The glands of Littre are rich in goblet cells and enter the spongy tissue between the vascular spaces and the trabeculae.

Question 13

The penile urethra receives arterial supply from a branch of the ______, which enters at the level of the penile bulb, and is known as the _____. Venous drainage of the bulbar urethra is by ___ veins that drain into the ___ plexus, which is the ____ vein. The penile urethral lymphatics drain through a lymphatic network that is associated with the mucous membrane.

Answer 13

The penile urethra receives arterial supply from a branch of the internal pudendal artery, which enters at the level of the penile bulb, and is known as the bulbourethral artery. Venous drainage of the bulbar urethra is by bulbar veins that drain into the prostatic plexus, which is the internal pudendal vein. The penile urethral lymphatics drain through a lymphatic network that is associated with the mucous membrane.