Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'quadratus lumborum'?

A. Any of the three pairs of muscles in the lateral neck, namely the the concept anterior, the concept medius, and the concept posterior. They are innervated by the spinal nerves C4-C8[WP].
B. An abdominal muscle that inserts on the last rib and transverse processes of lumbar vertebrae. It is irregular and quadrilateral in shape, and broader below than above.
C. A muscle that arises from the upper surface of the transverse process of the atlas and inserts into the under surface of the jugular process of the occipital bone.
D. A muscle that arise from the tubercle on the posterior arch of the and is inserted into the medial part of the inferior nuchal line of the occipital bone and the surface between it and the foramen magnum, and also takes some attachment to the spinal dura.

Answer: An abdominal muscle that inserts on the last rib and transverse processes of lumbar vertebrae. It is irregular and quadrilateral in shape, and broader below than above.