. The comparative anatomy of the domesticated animals. Veterinary anatomy. 214 THE MUSCLES. the origin of the anterior straight muscle of the thigh, from which it is separated by a space filled with fat; inwardly, with the crural vessels. It passes between the vastus internus and the pectineus, to reach the trochanter. Actions.—It is a flexor and rotator outwards of the thigh. 4. Small Psoas Muscle. (Fig. 108, 2.) Synonyms.—Psoas of the loins—Bourgelat. Sublumto-pubialis, or sublumbo-iliacus, according to Girard. {Psoas parvus—Percivall, The ktmbo-iliacus of Leyh.) Situation—Form—Structure.—Pl
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 214 THE MUSCLES. the origin of the anterior straight muscle of the thigh, from which it is separated by a space filled with fat; inwardly, with the crural vessels. It passes between the vastus internus and the pectineus, to reach the trochanter. Actions.—It is a flexor and rotator outwards of the thigh. 4. Small Psoas Muscle. (Fig. 108, 2.) Synonyms.—Psoas of the loins—Bourgelat. Sublumto-pubialis, or sublumbo-iliacus, according to Girard. {Psoas parvus—Percivall, The ktmbo-iliacus of Leyh.) Situation—Form—Structure.—Placed at the inner side of the great psoas, very much elongated, and semipenniform in shape, this muscle is terminated behind by a flattened tendon, and is composed of fleshy fibres, the longest of which ai"e anterior. These fasciculi are all directed backwards and outwards to gain the tendon. Attachments.—1, To the bodies of the three or four last dorsal, and to all the lumbar vertebras, by the anterior extremity of its fleshy fibres; 2, To the ilio-pectineal eminence and the lumbo-iliac aponeurosis, by the posterior extremity of its tendon. Belations.—By its inferior face with the pleura, the superior border of the diaphragm, the aorta or posterior vena cava, and the great sympathetic nerve; by its upper face, with the psoas magnus. It is traversed, near its vertebral insertions, by numerous vascular and nervous branches. Actions.—It flexes the pelvis on the sj^ine, when the loins are the fixed point; but should the pelvis be fixed, it arches or laterally inclines the lumbar region. It is also the tensor muscle of the lumbo-iliac aponeurosis. 5. Square Muscle of the Loins. (Fig. 109, "l.) Synonyms. — Sacro-costalis — Girard. {Sacro-lmnbalis—Ferclvall. Quadratus lumborum of Man.) Situation—Form— Structure —Attachments.—This muscle is comprised between the trans- verse processes of the lumbar region and the great psoas, and is elongate
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