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Dissection of iliopsoas muscle and lumbar plexus

Lumbar plexus; nerves to psoas major

Image #184-7

KEYWORDS: Muscles and tendons, Peripheral nervous system.

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Dissection of iliopsoas muscle and lumbar plexus

Lumbar plexus; nerves to psoas major

The left psoas major has been detached from its spinal origins and turned laterally. Nerves to the psoas, as well as the major parts of the lumbar plexus, have been exposed.

1 .	Right crus of diaphragm
2 .	Right kidney
3 .	Abdominal aorta (cut off)
4 .	Sympathetic trunk (pointer on sympathetic trunk ganglia)
5 .	Intervertebral disc L. II-III
6 .	Lumbar artery and vein (cut off)
7 .	Psoas major muscle
8 .	Quadratus lumborum muscle covered by transversalis fascia
9 .	Iliohypogastric nerve (faintly visible)
10 .	Ilioinguinal nerve
11 .	Lateral femoral cutaneous nerve
12 .	Genitofemoral nerve
13 .	Ureter
14 .	Middle sacral artery
15 .	Common iliac artery and vein
16 .	Lumbosacral trunk
17 .	Obturator nerve
18 .	Medial arcuate ligament
19 .	Diaphragm (Lateral arcuate ligament lies in area between pointers)
20 .	Rib XII
21 .	Subcostal nerve
22 .	Muscular branch of nerve L. II
23 .	Genitofemoral nerve
24 .	Lumbar nerve II
25 .	Lateral femoral cutaneous nerve
26 .	Lumbar nerve III
27 .	Psoas major muscle
28 .	Quadratus lumborum muscle
29 .	Lumbar nerve IV
30 .	Iliac crest
31 .	Iliacus muscle