Hernias Flashcards
Describe the inguinal region
It is the Junction between the anterior abdominal wall and the thigh
This area is between the ASIS and the pubic tubercle
The anterior abdominal wall is weakened in the inguinal region
It is clinically important because it is a potential site where most of the abdominal hernias occur.
It is anatomically important because structures exit and enter the abdominal cavity (e.g. spermatic cord, round ligament, vessels
What causes the inherent weakness in the abdominal wall in the groin
Caused by changes that occur in the development of the gonads.
Before the descent of the testes and the ovaries from their original position high in the anterior abdominal wall, a peritoneal outpouching (the processus vaginalis) forms, protruding through layers of the anterior abdominal wall
What do the testes and ovaries gain coverings from
Transversalis fascia (deepest) Second covering is from the internal oblique muscle ( a covering from the transversus is not acquired as the processus vaginalis passes under the arching fibres of the abdominal wall muscle) Its most superficial covering is the aponeurosis of the external oblique.
What forms as a result of the processus vaginalis
It is transformed into a tubular structure with multiple coverings from the layers of the anterior abdominal wall- forming the basic structure of the inguinal canal.
Summarise the inguinal canal
Inguinal canal – The testis and spermatic cord descend from the abdomen into the scrotum via the developing inguinal canal. in the female the uterine round ligament descends through the developing inguinal canal. (testicular descent starts after 7th wk of IUL and enter the inguinal canal around 28 wks of IUL and enters the scrotum by 32-36 wks of IUL.)
Summarise the femoral canal
Another canal below the inguinal ligament through which femoral artery and vein pass
What are these canals vulnerable to
These two canals remain vulnerable throughout life for potential herniation of the abdominal viscera to occur.
Define hernia
A hernia* is a condition in which part or whole of an organ or tissue abnormally protrude through the wall of the structure containing the organ or tissue.
Outline the anatomy of a hernia
Weakness/defect/hole on the wall through which the hernia protrudes
Hernial Sac – e.g. peritoneum with neck, body and fundus
Contents of the hernial sac - e.g. bowel, bladder
Hernial coverings - skin
Summarise the clinical features of hernias
A lump or protrusion in the groin
Appears intermittently or present all the time
Painless/painful and uncomfortable
Hernia may be reducible or irreducible
May be strangulated with tissue death- and associated with vomiting, constipation, intestinal obstruction – this is an emergency situation
List some facts about hernias in the groin
In both sexes most of the groin lumps or swellings are hernias
Inguinal hernias > femoral
Accounts for 10% of surgical outpatient referrals
Inguinal hernias accounts for 7% of surgical outpatient consultations
Accounts for 12% of operating theatre time
Inguinal hernia is 8 times greater in males than in females
Femoral hernias are rare in males -accounts for 2.5% of the groin swellings
Femoral hernias are higher in women and increases with age and number of pregnancies
List the different types of hernias
Inguinal Hernia
Indirect inguinal hernia
Direct inguinal hernia
Femoral Hernia
Describe the structure of the inguinal canal
Slit-like passageway that extends in a downwards and medial direction (oblique) just above and parallel to the lower half of the inguinal ligament
Present in both males and females, 4 cm long in adults
It begins as the deep inguinal ring and ends at the superficial inguinal ring.
What are the contents of the inguinal canal
In males- Contents: spermatic cord & ilioinguinal nerve
In females- Contents: round ligament & ilioinguinal nerve
Also genital branch of the genitofemoral nerve is present in both sexes
Describe the deep inguinal ring
Beginning of inguinal canal and formed halfway between the ASIS and pubic symphysis
It is just above the inguinal ligament and immediately lateral to the inferior epigastric vessels
Beginning of the tubular evagination of the transversalis fascia that forms one of the coverings (internal spermatic fascia) of the spermatic cord or round ligament