Anterior Abdominal Wall

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Author:
Bobopudge
ID:
56543
Filename:
Anterior Abdominal Wall
Updated:
2010-12-20 11:39:50
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Anatomy
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  1. State origin, insertion, nerve supply and action of:
    External Oblique Muscle
    • Origin: external surface of lower 8 ribs
    • Insertion: xiphoid process, linea alba, iliac crests, inguinal ligaments, pubic tubercle
    • Nerve supply: lower six thoracic nerves, ileohypogastric and ileoinguinal (L1)
    • Action: flexion and rotation of trunk
  2. State origin, insertion, nerve supply and action of:
    Internal Oblique Muscle
    • Origin: lateral part of inguinal ligament, ileac crest, lumber fascia
    • Insertion: xiphoid process, linea alba, symphysis pubis, and lower 3 ribs
    • Nerve supply: lower six thoracic nerves, ileohypogastric and ileoinguinal (L1)
    • Action: flexion and rotation of trunk
  3. Describe the the three layers of the skin
    epidermis, dermis, and hypodermis

    • Epidermis: stratified squamous
    • Dermis: is dense connective tissue
    • Hypodermis: loose aereolar connective tissue
  4. Describe the superficial fascia
    • upper abdomen: single layer of fatty connective tissue
    • lower abdomen: divided into two:
    • 1: superficial fatty layer (camper's fascia)
    • 2: deep membranous layer (scarpa's fascia)

    • *scarpa fascia fuses with fascia latta in the thigh
    • Fascia latta: the deep connective tissue of the thigh
  5. Important dermatomes
    • T4: Supplies the nipples.
    • T7: Supplies the xiphoid process.
    • T10: Supplies the umbilicus.
    • T12: Supplies the iguinal region.
  6. Describe venous drainage of anterior abdominal wall
    • Veins radiate out from umbilicus
    • Drain into lateral thoracic veins above (which drain into axillary veins)
    • Drain into superficial epigastric vein and great saphenous vein below (which drain into femoral vein)
    • Para-umbilical vein: connect the umbilicus to the portal vein.
    • form a Portal-systemic anastomosis
    • Clinical significance: enlarge if the portal vein is obstructed
  7. Discuss the development of the inguinal canal
    • Formed by the processes vaginalus
    • passes through the layers of the lower part of the anterior abdominal wall
    • It acquires a covering from each layer.
    • These three coverings are:
    • From the transversalice fascia - internal spermatic fascia
    • From the internal obliques - cremastaric fascia
    • From the external obliques - external spermatic fascia
  8. Describe the deep inguinal ring
    • Oval opening in the transversalice fascia
    • located half inch above mid-inguinal-point
    • It forms origin of the internal spermatic fascia.
  9. State the boundaries of the inguinal canal
    • Anterior: They are external oblique and laterally internal obliques.
    • Posterior: A transversealice fascia and medially the conjoint tendon.
    • Floor: Iguinal ligament and medially lucinar ligament.
    • Roof: Internal oblique and transversus abdominus.
  10. Describe the superfiscial inguinal ring
    A triangular defect in the external oblique aponeurosis, located just above and medial to the pubic tubercal, forms the origin of the external spermatic fascia.
  11. What is the function of the inguinal canal? How long is it?
    • carries spermatic cord in males
    • carries round ligament of uterus in females,
    • Carries the ileo-inguinal nerve in both
    • 1.5 inches long.
  12. Describe the lymph drainage of abdominal wall
    • Superficial lymph drainage:
    • Above umbilicus: Anterior axillary nodes
    • Below umbilicus: Superficial inguinal nodes

    • Deep Lymph Drainage:
    • External ileac nodes, internal thoracic nodes, media-stinal nodes and para-aortic nodes.
  13. State origin, insertion, nerve supply and action of: Transversus Abdominus
    • Origin: lower six ribs, lumbar fascia, iliac crest and the lateral part of the inguinal ligament
    • Insertion: linea alba
    • Nerve supply: lower six thoracic nerves, ileohypogastric and ileoinguinal (L1)
    • Action: flexion and rotation of trunk

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