Anterolateral Abdominal Wall And Inguinal Region Flashcards
Abdominal wall is divided into 4 walls namely
Anterior wall
Right lateral wall/right flank
Left lateral wall
Posterior abdominal wall
Anterolateral wall extends from
The thoracic cage to the pelvis
Anterolateral wall superior and inferior boundaries
Superiorly by costal margin
Inferiorly by inguinal ligament, iliac crest, pubic crest, symphisis pubis
What is the composition of the lateral abdominal wall
Skin Subcutaneous fascia Muscles and their aponeuroses and deep fascia Endoabdominal fascia Extraperitoneal fat Parietal peritoneum
Composition of the anterior abdominal wall
Skin Superficial fascia Anterior wall of rectus sheath Rectus muscle Posterior wall of rectus sheath Extraperitoneal fat Parietal peritoneum
What are the fascia of the anterolateral abdominal wall
Superficial fascia
Investing deep fascia on the external surfaces of the three layers of the muscles and their aponeuroses
Endoabdominal fascia
Inferior to the umbilicus, subcutaneous fascia has two layers known as
Superficial fatty layer(Camper’s fascia)
Deep membranous layer(Scarpa’s fascia
How many muscles are there in each half of the anterolateral wall
Five
The fibers of the external oblique muscle run in what direction
Inferomedially
External oblique originates from?
Lower 8 ribs
Where do the fleshy fibers of the external oblique muscle insert
Outer lip of the anterior half of iliac crest
Where do the aponeurosis of the external oblique muscle insert
Medial part : linea Alba from xiphoid process to symphysis
Lateral part : folded upwards and backwards upon itself to form inguinal ligament
Extemsions: of the aponeurosis :inguinal ligament
Lacunae ligament
Pectineal ligament
Fibers of internal oblique run in which direction
Fibers pass in superomedial direction
Origin of the internal oblique muscle
Thoracolumbar fascia, anterior 2/3 of iliac crest, lateral 1/3 of inguinal ligament
Insertion of the internal oblique muscle
Lower 3 or 4 ribs, linea Alba, pubic crest and pectineal line
The line at which the io becomes aponeurosis at mcl is called
Linea semi-lunaris
Fibers of the transverse abdominis muscle run in which direction
Fibers run almost transversely except for inferior fibers
Origin of the transversus abdominis muscle
Thoracolumbar fascia, internal lip of iliac crest, lateral 1/3 of inguinal ligament, internal surface of 7 to 12th costal cartilage
Insertion of transversus abdominis
Linea Alba, pubic crest, pectineal line
What is the neurovascular plane
Similar to the neurovacular bundle in the ribs. Lies between IO and transversus abdominis. Contains nerves and arteries supplying the anterolateral abdominal wall
At which point do the vessels in the neurovascular plane leave the plane and lie in subcutaneous tissue
Close to the midline. Start laterally though
What are tendinitis intersections of the rectus abdominis muscle
Places at which the rectus abdominis muscle is anchored anteriorly to the anterior rectus sheath
At which points are tendinous intersections located?
Xiphoid process
Umbilicus
Midway between first 2
Origin of the rectus abdominis muscle
Pubic crest, pubic tubercle, pubic symphysis
