Psoas

(sof-as) [ipoa, loin]. One of two mus- 34 cles, P. magnus and P. parvus. See Muscles, Table of. P. -absce , an absce , usually dependent upon tuberculous disease of the vertebra, making its way along the sheath of the psoas muscle and pointing at the front of the thigh, below Poupart’s ligament, to the outer side of the spine of the pubis. 531