Abd and peritoneum Flashcards
Site of inguinal hernia
above inguinal ligament
also site for passage of spermatic cord in males and round ligament of uterus in female
Site of femoral hernia
below inguinal ligament
also the site for passage of femoral artery, vein, nerve, etc
External abdominal oblique m. - origins
Superficial aspects of lower 8 ribs
Iliac crest, linea alba, pubic tubercle
Internal abdominal oblique m - origins
- Thoracolumbar fascia, iliac crest, inguinal ligament
- Costal cartilages of last 3-4 ribs, linea alba, pubic crest, pecten pubis
Transversus abdominis - origins
- Internal aspects of lower 6 costa cartilages, thoracolumbar fascia, iliac crest and inguinal ligament
- Linea alba, pubic crest, pecten pubis
Rectus abdominis m. - origins
- Pubic symphysis, pubic crest
- Anterior aspect of xiphoid process, ant aspects of costal cartilages 5-7
Tendinous intersections
Separations in the Rectus abdominis m.
Arcuate Line
Above: Posterior rectus sheath (transversus abdominis and Internal abdominal oblique tendons)
Below: No posterior rectus sheath!; just transversalis fascia. All 3 tendons jump on front of muscle (with external abdominal oblique).
“Little Pilot”
Gubernaculum; aids in the descent of the gonads.
-becomes round ligament of uterus in females
Spermatic cord covering - layers
- Extermal spermatic fascia (continuation of external abdominal oblique fascia)
- Cremaster muscle & fascia (from internal abdominal oblique fascia)
- Internal spermatic fascia (transversalis fascia)
- Tunica vaginalis (peritoneum)
Transversus abdominis doesn’t contribute.
75% of Anterior Abdominal Hernias
Superficial Inguinal ring
Direct Inguinal Hernia
- Pass directly through superficial ring
- Medial to inferior epigastric artery
- 25% of all hernias (1/3 of inguinal hernias)
Indirect Inguinal Hernia
- Passes through deep ring, inguinal canal, superficial ring
- Lateral to inferior epigastric artery
- 50% of all hernias; 7x more likely in males
- Can be congenital
Horizontal planes
a. Subcostal - L3
b. Transtubercular (between two tubercles on iliac crest) - L5
Vertical planes
c. Midclavicular/midinguinal (linea semilunaris)
What lies in the peritoneal cavity?
Nothing! (except serous fluid.
visceral peritoneum in contact with organs, parietal layer towards body wall.
Mesentery
Double layer of peritoneum
- often called “ligaments”
- Carry arteries, veins, nerves and/or lymphatics
Omentum
Double layer of peritoneum joining two viscera (usually associated with stomach and duodenum)
Intraperitoneal structure
Abdominal structure suspended by a mesentery.
They do NOT lie inside the peritoneal cavity
Ex: stomach, spleen, jejunum, ileum, transverse colon
Retroperitoneal structure
Abdominal structure not suspended by a mesentery - behind peritoneum.
Primary was not suspended by a mesentery earlier in development.
Secondary Retroperitoneal Structure
An abdominal structure suspended by a mesentery earlier in development
Ex: pancrease, ascending and descending colon.
Peritoneal Sacs
Lesser = behind stomach & liver, lesser omentum, greater omentum Greater = everywhere else
Connected by epiploic foramen (Foramen of Winslow)
Esophageal Constriction -Junction of Pharynx & esophagus (Cervical)
Vertebral Level = C6
Structures assoc = Cricopharyngeus m., clinically: upper esophageal sphincter
Esophageal Constriction - Aortic Arch
Vertebral Level = T5
Structures assoc = Sternal angle