RETROPERITONEAL CAVITY

Retroperitoneal = anything behind the peritoneum

Primary verus Secondary Peritoneum
Primary = was always retro
Secondary = Started as intra, became retro

(1) Psoas major muscle
(2) Psoas minor muscle
(3) Quadratus lumborum muscle
(4) Ilium
(5) Iliacus muscle

Lateral to Psoas Major: Femoral nerve
Medial to Psoas Major: Obturator nerve
Pierces Psoas Major: Genitofemoral

TEST QUESTION Insertion of the diaphram is the central tendon

1. Sternal part (post surface of xiphoid)
2. Costal part (lower 6 ribs + CC)
3. Vertebral part (vert columns and acurate ligament)

TQ! The right crus arises from the sides of the bodies of (L1-3) and intervertebral discs, and it splits to enclose the esophagus.

TQ! The left crus arises from the sides of the bodies of
L1-2 and the intervertebral disc.

TQ! Lateral to the crura, the diaphragm arises from the medial and lateral arcuate
ligaments

TQ! The medial arcuate ligament extends from the side of the body of L2 to the
transverse process of L1, and the lateral arcuate ligament extends from the
transverse process of L1 to the rib 12

Right dome of the diaphram is superior to rib 5 and the left is inferior to rib 5

These domes support the right and left
lungs, whereas the central tendon supports
the heart.

The pericardiophrenic artery (which comes from the internal thoracic) accompanies the phrenic nerve.

1. Musculophrenic artery (internal thoracic)
2. Superior phrenic artery (thoracic aorta)
3. Inferior phrenic artery (abdominal aorta)
4. Pericardiophrenic artery (internal
thoracic). It accompanies the phrenic
nerve
5. Posterior intercostal arteries

Motor Supply of Diaphram: Phrenic nerve (C3,4,5). The left phrenic
supplies the left dome and half the right
dome (central areas). The periphery is
supplied by the intercostal nerves

Sensory Supply of Diaphram: The central portion is supplied by the
phrenic. The periphery by the intercostal
nerves

NERVES OF THE
POSTERIOR
ABDOMINAL
WALL: Lumbar and
Sacral Plexuses