ANATOMY OF THE HORSE. 
3G3 
INTER-TRANS VERS ALES LUMBORUM. 
Small muscular slips running from the sharp border of one 
transverse process to that of the next to it; and included be¬ 
tween two strong and tense inter-transverse ligaments. 
Action. —To approximate those processes. 
sacro - lumbalis .— Sacro-costalis . 
Situation. —Deep seated, in the loins : above the psoae. 
. Form. —Flat, thin ; border, semicular. 
Attachment. —Posteriorly, to the transverse process of the last 
lumbar vertebra, and to the body of the sacrum; anteriorly, to 
the other transverse processes of the loins ; and to the last rib. 
Relations. —Superiorly, it is opposed to the transverse pro¬ 
cesses of the loins ; inferiorly, to the psoas magnus. 
Structure. —A strong and flattened tendon attaches it to the 
sacrum, which curves forwards, but disappears before it reaches 
the last rib: the other parts consist of pale disgregated fibres, 
intermixed with thin, curvilinear slips of tendon. 
Action. —To co-operate with the inter-transversales lumborum 
in approaching the transverse processes ; and, at the same time, 
to draw back and render fixed the last rib. 
psoas magnus .— Sub-lumbo-trochantineu $. 
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Situation. —Postero-lateral parts of the spine; and superior 
part of the inlet of the pelvis. 
Form. —Elongated; fusiform; thicker in the middle than at 
the extremities; anterior extremity, flattened, extended and 
pointed. 
Attachment. —Anteriorly, to the inner surfaces of the two last 
ribs, close to their vertebral articulations; to the body and trans¬ 
verse process of the last dorsal vertebra, and to the same of all 
the lumbar vertebrae : posteriorly, to the small internal trochanter 
of the os femoris. 
Relations. —Anteriorly and externally, with the diaphragm ; 
posteriorly and externally, with the iliacus; inferiorly, with the 
kidney and peritoneum; on the inner side, with the psoas mag¬ 
nus and lumbar vertebrae ; behind, with the quadratus lumborum. 
Structure. —Anterior attachments, fleshy. The posterior end 
is included within an aponeurosis, which itself terminates in a 
flat tendon, into which are concentrated and inserted the fibres of 
the iliacus. 
Action. —To bend the haunch upon the pelvis by drawing it 
forward, as in progression. Supposing it to act while the hind 
