The psoas major unites with the iliacus at the level of the inguinal ligament and crosses the hip joint to insert on the lesser trochanter of the femur.
12.
The "'psoas minor "'is a long, slender skeletal muscle which, when present, is located anterior to the psoas major muscle.
13.
In humans, the ureters arise from the renal pelvis on the medial aspect of each kidney before descending towards the bladder on the front of the psoas major muscle.
14.
The genitofemoral nerve ( L1, L2 ) leaves psoas major below the two former nerves, immediately divides into two branches that descends along the muscle's anterior side.
15.
The hamstrings, adductor magnus and gluteus maximus work concentrically in the legs, while the psoas major, iliacus, and rectus femoris work eccentrically keeping the hip in neutral extension.
16.
The psoas minor, only present in about 50 per cent of subjects, originates above psoas major to stretch obliquely down to its insertion on the interior side of the major muscle.
17.
The lumbar plexus is formed lateral to the intervertebral foramina by the ventral rami of the first four lumbar spinal nerves ( L1-L4 ), which all pass through psoas major.
18.
The nerve emerges from the psoas major in the outer part of its upper border, and crosses in front of the quadratus lumborum to the iliac crest, running behind the kidneys.
19.
It lies in front of the left Psoas major and left renal vessels, and is covered in front, and partly at the sides, by peritoneum continuous with the left portion of the mesentery.
20.
The right lateral aortic glands, are situated partly in front of the inferior vena cava near the termination of the renal vein, and partly behind it on the origin of the psoas major, and on the right crus of diaphragm.
