518 LABORATORY MANUAL OF HUMAN ANATOMY 



(gc) Saphenous nerve (N. saphenus). 



Its branches are studied in the dissection of the lower 

 extremity. 



What is the lumbosacral trunk (truncus lumbosacralis) (0. 

 T. lumbosacral cord), and what nerves unite to form it? What 

 rami anteriores of spinal nerves unite to form the lumbar 

 plexus f l 



FASCIA AND MUSCLES. 



Cut through the aorta and vena cava inferior at the level of 

 the bifurcation of the aorta. Separate the pelvis from the rest 

 of the trunk at the level of the disk between the third and fourth 

 lumbar vertebrae. 



Iliac Fascia (Fascia iliaca). (Vide Spalteholz, Fig. 370.) 



Note the relation of .this fascia to the M. iliopsoas, the lumbar 

 vertebrae, the crista iliaca, and medially to the pelvic fascia 

 (fascia pelvis). Show that these two fasciae are continuous. 

 Determine the line of attachment of the fascia to Poupart's liga- 

 ment (ligamentum inguinale [Pouparti]) and trace^ it down- 

 ward to the eminentia iliopectinea. What are the fascia iliopec- 

 tinea, lacuna musculorum and lacuna vasorum? (Vide Fig. 58.) 

 What is the relation of this fascia to the femoral vessels! 

 Locate at this stage of your dissection the annulus femoralis, 

 and, if possible, its septum (septum femorale [Cloqueti] ). From 

 what fascia is this septum derived! Dissect out the lymph-nodes 

 of Rosenmuller. Determine their exact position and communi- 

 cations. Dissect out the fascia covering the M. quadratus lum- 

 borum, noting its exact attachments and general disposition. 



Muscles at the Back of the Abdomen. 



Clean the following muscles, noting the exact form, position, 

 origin, insertion, action, and innervation of each. Avoid the 

 sympathetic cord found medial from the iliopsoas muscle, also 

 the nerves of the lumbar plexus, which may be readily seen, and 

 take care not to destroy the iliac fascia as it passes into the 

 fascia pelvis. 



(a) Quadrate muscle of the loins (M. quadratus lumborum). 



(b) Iliopsoas muscle (M. iliopsoas}. 



(ba) Greater psoas (M. psoas major). 



(bb) Lesser psoas (M. psoas minor), 

 (be) Iliac (M. iliacus). 



1 For a statistical study of the variations which occur in this region, see the 

 paper by Bardeen and Elting, Anatomischer Anzeiger, 1901, vol. xix. p. 124. 



