Diagnostic Ultrasound - Abdomen and Pelvis

Testes
EPIDIDYMIS AND SCROTAL WALL LAYERS IN SITU
Ureter
Anatomy: Pelvis
Seminal vesicle
Vas deferens
Prostate
Corpus spongiosum
Head of epididymis
Tail of epididymis
External oblique muscle
Transversus abdominis
Transversalis fascia (level of
internal inguinal ring)
Internal oblique muscle
External oblique fascia
Superficial (external) inguinal
ring
External spermatic fascia
Cremasteric muscle
(Top) Graphic shows that the tail of the epididymis is loosely attached to the lower pole of the testis by areolar tissue. The vas deferens
(also referred to as the ductus deferens) emerges from the tail at an acute angle and continues cephalad as part of the spermatic cord.
After passing through the inguinal canal, the vas deferens courses posteriorly to unite with the duct of the seminal vesicle to form the
ejaculatory duct. These narrow ducts have thick, muscular walls composed of smooth muscle, which reflexly contract during ejaculation
and propel sperm forward. (Bottom) The muscle layers of the pelvic wall have been separated to show the spermatic cord as it passes
through the inguinal canal. The cremasteric muscle is derived from the internal oblique muscle, while the external spermatic fascia is
formed by the fascia of the external oblique muscle.
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