Diagnostic Ultrasound - Abdomen and Pelvis

Abdominal Wall
Anatomy: Abdomen
PARASPINAL MUSCLES
Subcutaneous fat
Skin
Spinous process
Left erector spinae muscle
Left kidney
Right erector spinae muscle
Right kidney
Subcutaneous fat
Left longissimus thoracis and iliocostalis
muscles
Left quadratus lumborum muscle
Left kidney
Vertebral body
Psoas muscle
Aorta
Right rectus abdominis muscle
Right lobe of liver
Right kidney
Lumbar vertebra
Spinous process
Left psoas muscle
Left quadratus lumborum m.
Left erector spinae muscle
(Top) Transverse extended FOV grayscale US of the back (with patient prone) shows the erector spinae muscles flanking the spinous
process. They are invested by lumbodorsal fascia, which also invests the anteriorly located quadratus lumborum muscle. The kidneys are
partially demonstrated. (Middle) Transverse oblique grayscale US of the left erector spinae muscle (with patient prone). The 3 columns
(iliocostalis, longissimus, and spinalis muscles, from lateral to medial) comprising the erector spinae are not clearly separated from one
another on ultrasound. They are identified collectively as a thick fleshy muscle lateral to the spinous process. (Bottom) Axial correlative
CECT of the paraspinal muscles at the level of the kidneys shows the erector spinae muscles originate from a broad and thick tendon,
which originates from the sacrum and iliac crest, lumbar, and 11th and 12th thoracic spinous processes.
106