Which statement is true about the posterior thoracolumbar fascia's location?

Which statement is true about the posterior thoracolumbar fascia's location?

• A. From 12th rib to iliac crest
• B. Lateral to internal oblique & transversus abdominis
• C. Overlie latissimus dorsi
• D. All of the above

Answer: (D)

The posterior layer of the thoracolumbar fascia is a thick sheet in the lower back that forms the back boundary of the lumbar region. It extends from the 12th rib down to the iliac crest, serving as a broad attachment plane for surrounding muscles. Laterally, it blends with the aponeuroses of the internal oblique and transversus abdominis, placing it adjacent to those abdominal-wall muscles. It also lies in relation to the latissimus dorsi, contributing to the fascia that overlies or envelops this muscle as it extends across the posterior-lateral trunk. Because these anatomical relationships are all accurate, the statement that describes all of these aspects is correct.

The posterior layer of the thoracolumbar fascia is a thick sheet in the lower back that forms the back boundary of the lumbar region. It extends from the 12th rib down to the iliac crest, serving as a broad attachment plane for surrounding muscles. Laterally, it blends with the aponeuroses of the internal oblique and transversus abdominis, placing it adjacent to those abdominal-wall muscles. It also lies in relation to the latissimus dorsi, contributing to the fascia that overlies or envelops this muscle as it extends across the posterior-lateral trunk. Because these anatomical relationships are all accurate, the statement that describes all of these aspects is correct.