|Front of abdomen, showing surface markings for arteries and inguinal canal. (Inguinal canal is tube at lower left.)|
|The scrotum. On the left side the cavity of the tunica vaginalis has been opened; on the right side only the layers superficial to the Cremaster have been removed. (Right inguinal canal visible at upper left.)|
|Gray's||subject #258 1239|
The inguinal canal is a passage in the anterior (toward the front of the body) abdominal wall which in men conveys the spermatic cord and in women the round ligament. The inguinal canal is larger and more prominent in men. Each person has two, on the left and right sides of the abdomen.
Approximately 3.75 to 4 cm .
It is obliquely directed anteroinferiorly and medially.
A first-order approximation is to visualize the canal as a cylinder, 
To help define the boundaries, the canal is often further approximated as a box with six sides. Not including the two rings, the remaining four sides are usually called the "anterior wall", "posterior wall", "roof", and "floor". These consist of the following:
|superior wall (roof):
Medial crus of aponeurosis of external oblique
Musculoaponeurotic arches of internal oblique and transverse abdominal
aponeurosis of external oblique
fleshy part of internal oblique (lateral third of canal only)
superficial inguinal ring (medial third of canal only)
|(inguinal canal)||posterior wall:
conjoint tendon (Inguinal falx,reflected part of inguinal ligament, medial third of canal only)
deep inguinal ring (lateral third of canal only)
|inferior wall (floor):
lacunar ligament (medial third of canal only)
iliopubic tract (lateral third of canal only)
- in males : the spermatic cord and its coverings + the ilioinguinal nerve.
- in females : the round ligament of the uterus + the ilioinguinal nerve.
The classic description of the contents of spermatic cord in the male are:
During development gonads (ovaries or testes) descend from their starting point on the posterior abdominal wall (para-aortically) from labioscrotal swelling near the kidneys down the abdomen and through the inguinal canal to reach the scrotum. The testis then descends through the abdominal wall into the scrotum, behind the processus vaginalis (which later obliterates). Thus lymphatic spread from a testicular tumour is to the para-aortic nodes first, and not the inguinal nodes.
Abdominal contents (potentially including intestine) can be abnormally displaced from the abdominal cavity. Where these contents exit through the inguinal canal the condition is known as an indirect or oblique inguinal hernia. This can also cause infertility. This condition is far more common in men than in women, owing to the inguinal canal's small size in women.
A hernia that exits the abdominal cavity directly through the deep layers of the abdominal wall, thereby bypassing the inguinal canal, is known as a direct inguinal hernia.
|Wikimedia Commons has media related to Inguinal canal.|
- "Gross Anatomy Image". Retrieved 2007-11-20.
- Adam Mitchell; Drake, Richard; Gray, Henry David; Wayne Vogl (2005). Gray's anatomy for students. Elsevier/Churchill Livingstone. p. 260. ISBN 0-443-06612-4.
- Dalley, Arthur F.; Moore, Keith L. (2006). Clinically oriented anatomy. Hagerstown, MD: Lippincott Williams & Wilkins. p. 217. ISBN 0-7817-3639-0.
- Arthur F., II Dalley; Anne M. R. Agur. Grant's Atlas of Anatomy. Hagerstown, MD: Lippincott Williams & Wilkins. p. 102. ISBN 0-7817-4255-2.
- "Anatomy Tables - Inguinal Region". Retrieved 2007-11-20.
^ Adam Mitchell; Drake, Richard; Gray, Henry David; Wayne Vogl (2010). Gray's anatomy for students. Elsevier/Churchill Livingstone. pp. 286. ISBN 0-443-06612-4.
- SUNY Labs 36:01-0102
- Atlas of anatomy at UMich abdo_wall63 - "The Male & Female Inguinal Canal"
- Diagram at nurseminerva.co.uk