Chapter I: The Sublumbar Muscles

The =psoas minor= begins at the disc between the twelfth and thirteenth thoracic vertebræ.

The =psoas major= has a fleshy origin on the posterior border of the last rib, and a thin tendon attached to the twelfth rib.

The =iliacus= begins under the body of the sixth lumbar vertebra, and is more closely united with the psoas major than in the horse.

The =quadratus lumborum= extends as far forward as the body of the tenth or eleventh thoracic vertebra.