Diagnostic Ultrasound - Abdomen and Pelvis

Abdominal Wall
MUSCLES OF BACK IN SITU
Anatomy: Abdomen
Spinous process
Spinalis thoracis muscle
Longissimus thoracis
muscle
Iliocostalis muscle
Serratus posterior
inferior muscle
Transversus abdominis
(muscle and tendon)
Internal oblique muscle
External oblique muscle
Iliac crest
Graphic shows the paraspinal muscles and muscles of the back. The latissimus dorsi muscles are not included. The erector spinae have
thick tendinous origins from the sacral and iliac crests and the lumbar and 11th to 12th thoracic spinous processes. Superiorly, the
muscle becomes fleshy, and in the upper lumbar region subdivides to become the iliocostalis, longissimus, and spinalis muscles (from
lateral to medial), tapering as they insert into the vertebrae and ribs. The erector muscles flank the spinous processes and span the
length of the posterior thorax and abdomen. They are responsible for extension of the vertebral column.
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