Anterior abdominal wall Flashcards Preview

Anatomy: Abdomen (based on Dave's notes only so far) > Anterior abdominal wall > Flashcards

Flashcards in Anterior abdominal wall Deck (47)
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Origin of external oblique

Arise just lateral to the anterior extremities of the lower eight ribs. Upper four interdigitate with serratus anterior. Lower four interdigitate with lat dorsi.


Insertion of external oblique

Inserts to the outer half of the iliac crest, inguinal ligament, pubic tubercle, the aponeurosis of the rectus sheath and linea alba, and xiphisternum


Borders of external oblique

Three borders; a posterior muscular, and an upper and lower aponeurotic. The first two lie free. The latter is rolled.


Arterial supply of external oblique

Check: Branches of superior and inferior epigastric, superficial epigastric, the lumbar and deep circumflex arteries, superficial circumflex iliac arteries, ascending branch of deep circumflex artery


Borders of lumbar triangle of petit

Anterior border is the posterior margin of external oblique
Posterior border is the anterior margin of lat dorsi
Base is the iliac crest
Floor is the internal oblique


What artery is at risk in a gridiron incision?

The ascending branch of the deep circumflex iliac artery


What planes divide the abdomen into nine regions?

Left and right midclavicular lines: extend down to midinguinal points
Intertubercular plane: runs between the tubercles of the iliac crests
Transpyloric plane: found midway between the jugular notch and the top of the pubic symphysis. Some clinicians use the supcostal plane, a little lower.


Name the nine abdominal regions

Three rows from superior to inferior:
Left and right hypochondral and epigastric
Left and right lumbar and umbilical
Left and right iliac and hypogastric or suprapubic


Innervation of external oblique

Lateral cutaneous branches of the lower intercostal and subcostal nerves (T7-12)


What are the attachments and significance of the upper border of the external oblique aponeurosis

Runs free from the fifth rib to the xiphisternum. Is the only structure in the anterior rectus sheath above the costal margin.


Innervation of internal oblique

Lower intercostal and subcostal nerves (T7-12) and iliohypogastric and ilioinguinal nerves (L1). The lowest fibres are innervated by L1 which is hence responsible for the integrity of the inguinal canal


Innervation of transversus abdomens

Lower intercostal and subcostal nerves (T7-12) and iliohypogastric and ilioinguinal nerves (L1). The lowest fibres are innervated by L1 which is hence responsible for the integrity of the inguinal canal


Innervation of pyrimidalis

Subcostal nerve T12


Origin and insertion of the inguinal ligament of Poupart

ASIS to pubic tubercle


What happens to the inguinal ligament when the thigh is extended?

The fascia lata pulls the ligament downward in a genlt convexity


What abdominal muscles arise from which part of the inguinal ligament?

The edge of the ligament is inrolled. The internal oblique and transverses muscles arise from the lateral part of this gutter


Describe the relations of the superficial inguinal ring

V shaped gap above and lateral to the pubic tubercle. The gap extends down to the pubic crest, medial to the tubercle. The aponeurosis is attached to the medial part of the pubic crest, beside the pubic symphysis.


Describe the relations and give the eponym of the lacunar ligament

Arises from the medial end of the inguianl ligament and extends backwards to the pectineal line


What are the intercrural fibres?

Found at the apex of the superficial inguinal ring, fibres running at right angles to those of the aponeurosis. These blend and prevent the crura from separating.


Where does the reflected part of the inguinal ligament run?

From the pubic tubercle, fibres running upwards and medially behind the spermatic cord to interdigitate in the linea alba


Origin of internal oblique muscle

Lumbar fascia, anterior two thirds of iliac crest and lateral two thirds of inguinal ligament


Insertion of internal oblique muscle

Costal margin, aponeurosis of rectus sheath (both ant and post), conjoint tendon to pubic crest and pectineal line.
The anterior configuration changes at the conjoint tendon
A free lower border arches over the spermatic cord - laterally in front of the cord, medially behind the cord


Origin of transversus abdominus

Costal margin (from inside each costal cartilage, interdigitating with the costal origins of the diaphragm), lumbar fascia of quadrates lumborum,internal lip of iliac crest, the fascia over iliacus, and the lateral half of inguinal ligament deep to OM


Insertion of transverses abdominus

Aponeurosis of post rectus sheath above arcuate line, and ant rectus sheath below arcuate line, fusing behind IOM fibres then together forming the conjoint tendon to pubic crest and pectineal line


Origin of rectus abdominus

Two heads per belly; medial from pubic crest and lateral from pubic symphysis.


Insertion of rectus abdominus

Most to 5th, 6th, 7th costal cartilages (= EOM), some to medial inferior costal margin (i.e. lower border of 7th costal cartilage = IOM, and the xiphisternal fibres of the diaphragm = int oblique)


Action of rectus abdominus

Flexes trunk, aids forced expiration and increases IAP


Action of external and internal oblique muscles

Support, expiration, raises IAP and with muscles of opposite side abducts and rotates trunk


Action of transversus abdominus

Support, expiration, conjoint tendon supports inguinal canal


Action of pyrimidalis

Reinforces rectus sheath