. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. MUSCLES OF THE TRUNK. 271 4. Small Psoas Muscle (Psoas Parvus) (Fig. 165, 2). Synonyms.—Psoas of tlie loins—Bourgelat. Sublumbo-pubialis, or sublumbo-iliacus, according to Girard. (Psoas parvus—Percivall. Tlie lombo-iliacus of Leyh.) Situation—Form—Structure. Placed at the inner side of the psoas magnus, very much elon,ii:ated, and semipennifonn in shape, this muscle is terminated behind by a flattened tendon, and is composed of fleshy fibres, the lonpjest of which are anterior. These fasciculi are all directed
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. MUSCLES OF THE TRUNK. 271 4. Small Psoas Muscle (Psoas Parvus) (Fig. 165, 2). Synonyms.—Psoas of tlie loins—Bourgelat. Sublumbo-pubialis, or sublumbo-iliacus, according to Girard. (Psoas parvus—Percivall. Tlie lombo-iliacus of Leyh.) Situation—Form—Structure. Placed at the inner side of the psoas magnus, very much elon,ii:ated, and semipennifonn in shape, this muscle is terminated behind by a flattened tendon, and is composed of fleshy fibres, the lonpjest of which are anterior. These fasciculi are all directed backwards and outwards to gain the tendon. Attachmentfi.—1. To the bodies of the three or four last dorsal, and to all the lumbar vertebrae, by the anterior extremity of its fleshy fibres. 2. To the ilio-pectineal line and the lumbo-iliac aponeurosis, by the pos- terior extremity of its tendon. Relations.—By its inferior face with the pleura, the superior border of the diaphragm, the aorta or pos- terior vena cava, and the great sympathetic nerve ; by its upper face, with the psoas magnus. It is tra- versed, near its vertebral insertions, by niunerous vascular and nervous branches. Actions.—It flexes the pelvis on the spine, 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. Fig. DEEP MUSCLES OF THE SUBLUMBAR REGION. 1, Quadratus Inniborum ; 2, 2, intertransversales; 3, small retractor muscle of the last rib—a de- pendent of the small oblique of the abdomen. 5. Square Muscle of the Loras (Quadratus Lumborum) (Fig. 166, 1). Synonyms.—Sacro-costalis—Girard. (Sacro-lumbalis—Percivall. Quadratus lumborum of Man.) Situation—Form—Structure—Attachments.—This muscle is comprised between the transverse processes of the lumbar region and the psoas magnus, is elongated from before to behind, flattened above and below, and di
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