Dictionary.net

• Origin: Front of sacrum, great sacro-sciatic ligament. Insertion: Great trochanter. Nerve: Sacral plexus. Action: Rotates thigh out when extended; abducts it when flexed.

1900 - A dictionary of medicine and the allied sciences
By Alexander Duane

• The pyramidalis muscle.

1916 - Appleton's medical dictionary
By Smith Ely Jelliffe