200 ANATOMY OF THE ABDOMEN, ETC, 





transverse ligament, in company witli the articular branch of the 

 internal circumflex artery. When the accessory nerve is wanting, 

 the hip-joint is supplied by a branch of the obturator nerve, 



The lumbo-sacral nerve, from the fourth and fifth lumbar nerve 

 descends into the pelvis over the base of the sacrum, and unites tl 

 lumbar with the sacral plexus. 



The dissection of these nerves will have exposed the in- 

 ternal abdominal muscles. 



The QUADRATUS LUMBORUM is covered in by the anteri< 

 layer of the lumbar fascia ; this being removed, it will 

 found to arise from the last rib, and the transverse pi 

 cesses of the upper four lumbar vertebrae, and to 

 inserted into the posterior part of the crest of the ilium. 

 If the muscle is divided, and the two ends reflected, the 

 middle portion of the lumbar fascia will be exposed. 



The PSOAS PARVUS MUSCLE lies in front of and upon the 

 psoas magnus ; it arises from the sides of the bodies of the 

 last dorsal and first lumbar vertebrae, forming a small belly 

 which expands into a broad, flat tendon, which, losing 

 itself in the fascia of the iliacus muscle, is inserted into 

 the pectineal line and ilio-pectineal eminence in a manner 

 calculated to prevent the contractions of the psoas magnus 

 muscle from compressing the iliac vessels. This muscle is 

 frequently wanting; when absent the fascia iliaca is more 

 developed, and supplies its place. 



The PSOAS MAGNUS MUSCLE is a long muscle, lying- 

 parallel to the vertebral column, and arising from the sides 

 of the bodies of the last dorsal, and four upper lumbar 

 vertebrae, and from the transverse processes of all the 

 lumbar vertebrae; it forms the border of the true pelvis 

 laterally, and is inserted, in common with the iliacus 

 internus muscle, into the trochanter minor of the femur, 

 and an inch or more of the shaft of the bone below it. 

 That portion arising from the transverse processes is some- 

 times distinct from the rest of the muscle in its whole 

 course. 



The ILIACUS INTERNUS MUSCLE arises from the transverse 

 process of the last lumbar vertebra, the crest and concavity 

 of the ilium, and the anterior part of the capsule of the 

 hip-joint, and in common with the tendon of the psoas 

 magnus, is inserted into the lesser trochanter of the femur. 

 The insertions of neither of these muscles can be satis- 

 factorily seen until after the dissection of the muscles of 

 the anterior femoral region. 



