Inguinal Canal - youtube

Question 1

What forms the floor of the inguinal canal?

Answer 1

Ignuinal ligament - rolled inferior/free edge margin of aponeurosis of ext oblique. Pubic tubercle to ASIS

Question 2

Lacunar ligament?

Answer 2

At pubic tubercle fibres of the inguinal ligament reflect laterally. Extend further laterally onto pectineal line to form the pectineal ligament

Question 3

Where is there a defect in ext oblique?

Answer 3

Triangular ring superior lateral to pubic tubercle. Is the superficial inguinal ring.

Question 4

Where is the SIR thickened?

Answer 4

Laterally and medially to form CRUS/crura that give rise to the external spermatic fascia

Question 5

DIR?

Answer 5

Mid-inguinal point - half way between ASIS and pubic symphysis. 1.5-2cm above the inguinal ligament. Lateral to the inferior epigastric artery. Oval opening. Gives rise to the internal spermatic fascia of the spermatic cord

Question 6

Inguinal canal…

Answer 6

Parallel to inguinal lig, passage runs obliquely through the anterior abdominal wall

Question 7

Ant border?

Answer 7

Apon of external oblique and internal oblique at the lateral 1/3 (the lower fibres also curve over the canal to help form the roof. Then pass behind the canal and attach to the pubic tubercle - medially form the posterior wall of the canal.

Question 8

Transversus abdominus?

Answer 8

Most deep. From ing ligament laterally. Some fibres curve posteriorly over the inguinal canal helping to form the roof. Medially also form the posterior wall.

Question 9

Posterior wall of the canal.

Answer 9

Both trans abd and int oblique curve behind the canal and insert onto the pubic tubercle to form the conjoint tendon. Also transversalis fascia.

Question 10

Contents?

Answer 10

Males: Spermatic cord and ilioinguinal nerve enters half way along to testis
Females: Round ligament of the uterus and nerve to labia majora

Question 11

Spermatic cord contents

Answer 11

• testicular artery(para-aortic L2 - testes and epidymis)
• artery of vas def (vasectomy)
• cremasteric artery
• genital branch of genitofemoral nerve (L1, L2) - cremastor muscle and skin of scrotum
• **ilioinguinal nerve (L1) - pierces through int obl, runs outside of the cord and exits the SIR having not passed through the DIR
• sympathetic nerves from testicular plexus
• vas def
• lymphatics (para-aortic L2 nodes - origin of testicular arteries)
• tunica vaginalis
• pampiniform plexus (temp regulation, forms a single vein at DIR)