Diagnostic Ultrasound - Abdomen and Pelvis

09.07.2019 Views

Abdominal Wall ANTERIOR ABDOMINAL WALL Anatomy: Abdomen Rectus muscle Linea alba External oblique muscle Tendinous inscription Aponeuroses & rectus sheath Internal oblique muscle Umbilicus Linea semilunaris Anterior layer of rectus sheath Inguinal ligament Graphic shows the aponeuroses of the internal and external oblique and transverse abdominal muscles are 2-layered and interweave with each other, covering the rectus muscle, constituting the rectus sheath and linea alba. About midway between the umbilicus and symphysis, at the arcuate line, the posterior rectus sheath ends (arcuate line), and the transversalis fascia is the only structure between the rectus muscle and parietal peritoneum. 97

Abdominal Wall Anatomy: Abdomen POSTERIOR ABDOMINAL WALL Central tendon (of diaphragm) Median arcuate ligament arches Esophagus Right crus of diaphragm Oblique & transverse muscles Right crus of diaphragm Medial arcuate ligament Lateral arcuate ligament Left crus of diaphragm Quadratus lumborum muscle Psoas minor muscle Anterior longitudinal ligament Psoas major muscle Iliacus muscle Levator ani muscle Rectum Piriformis muscle Inguinal ligament Urethra Insertion of iliopsoas muscle Graphic shows the lumbar vertebrae are covered and attached by the anterior longitudinal ligament, and the diaphragmatic crura are closely attached to it, as are the origins of the psoas muscles, which also arise from the transverse processes. Iliacus muscle arises from the iliac fossa of the pelvis and inserts into the tendon of the psoas major, constituting the iliopsoas muscle, which inserts onto the lesser trochanter. Quadratus lumborum arises from the iliac crest and inserts onto the 12th rib and transverse processes of the lumbar vertebrae. Diaphragmatic and transverse abdominal fibers interlace. Psoas and quadratus lumborum pass behind the diaphragm under medial and lateral arcuate ligaments. 98

Abdominal Wall<br />

ANTERIOR ABDOMINAL WALL<br />

Anatomy: <strong>Abdomen</strong><br />

Rectus muscle<br />

Linea alba<br />

External oblique muscle<br />

Tendinous inscription<br />

Aponeuroses & rectus<br />

sheath<br />

Internal oblique muscle<br />

Umbilicus<br />

Linea semilunaris<br />

Anterior layer of rectus<br />

sheath<br />

Inguinal ligament<br />

Graphic shows the aponeuroses of the internal <strong>and</strong> external oblique <strong>and</strong> transverse abdominal muscles are 2-layered <strong>and</strong> interweave<br />

with each other, covering the rectus muscle, constituting the rectus sheath <strong>and</strong> linea alba. About midway between the umbilicus <strong>and</strong><br />

symphysis, at the arcuate line, the posterior rectus sheath ends (arcuate line), <strong>and</strong> the transversalis fascia is the only structure between<br />

the rectus muscle <strong>and</strong> parietal peritoneum.<br />

97

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