Reproductive Organs Flashcards
What is the inguinal canal?
Oblique passage which allows structures to pass from abdominal wall to external genitalia
Where is the inguinal canal located (in relation to the pelvis)?
Above the inguinal ligament, along its medial half
What is the deep inguinal ring?
Aperture in the transversalis fascia
What is the superficial inguinal ring?
Aperture in the external oblique aponeurosis
What does the inguinal canal transmit in males?
Spermatic cord
What does the inguinal canal transmit in females?
Round ligament
What are factors that normally prevent herniation of abdominal contents through the inguinal canal? (2)
- Deep and superficial inguinal rings are in different positions
- Lower fibres of transverse abdominis and internal oblique arch over canal, closing it during abdominal contraction
What does the inguinal canal transmit in both sexes?
Ilioinguinal nerve
What are the 3 layers of tissue the spermatic cord acquires as it travels through the inguinal canal?
- Internal spermatic fascia
- Cremeasteric fascia
- Superficial spermatic fascia
Where is the internal spermatic fascia derived from?
Transverse abdominis muscle
Where is the cremasteric fascia derived from?
Internal oblique muscle
Where is the superficial spermatic fascia derived from?
Aponeurosis from external oblique
Describe the path of the spermatic cord and where it acquires its extra layers
Deep inguinal ring - internal spermatic fascia
Cremasteric fascia
Superficial inguinal ring - superficial spermatic fascia
What are the 3 arteries in the spermatic cord?
- Artery of the vas
- Cremaster artery
- Testicular artery
What are the 3 veins in the spermatic cord?
- Vein of the vas
- Cremasteric vein
- Testicular vein
What are the 3 nerves in the spermatic cord?
- Ilioinguinal nerve
- Genitofemoral nerve
- Sympathetic nerve (vas & testicular pain)
What does the ilioinguinal nerve do?
Skin sensation to anterior 1/3 of external genitalia
What does the genitofemoral nerve innervate?
Cremaster muscle
What 3 structures are in the spermatic cord?
- Vas deferens
- Tunica vaginalis
- Lymphatics
What is the tuica vaginalis?
Sac of peritoneum covering the testes
What is the processus vaginalis?
Tube-like connection from tunica vaginalis up to peritoneum
What is the convoluted tube lying on the posterior border of the testis?
Epididymis - sperm passes along it to the vas deferens
What is the thick white coat that covers the testis, found under the tunica vaginalis?
Tunica albuginea
What forms the testicular vein?
Pampiniform plexus of veins
What important role do veins play in the testes?
Temperature control to optimise sperm production
How does scrotal skin appear? (3)
Thin, wrinkled and more darkly pigmented
What divides the scrotum into right and left halves?
Incomplete midline septum
The fascia under the scrotal skin contain fibres of what involuntary muscle?
Dartos fascia
What is Buck’s fascia?
Deep fascia that forms a thick layer over the corpus cavernosum and a thinner layer over the corpus spongiosum
What are the 3 cylinders of erectile tissue?
2 cylinder of corpus cavernosum
1 cylinder of corpus spongiosum
Function of the corpus cavernuosum?
Fills with blood, allowing penis to become HARD
Function of the corpus spongiosum? (2)
Transmits the URETHRA
Enables penis to become ERECT
What is the glans penis?
The distal end of the penis, covered by foreskin.