452 LABORATORY MANUAL OF HUMAN ANATOMY 



(6) Anterior cutaneous ramus of iliohypogastric nerve (ramus cutaneus 

 anterior N. iliohypogastrici) (0. T. hypogastric branch). 



(c) Ilio-inguinal nerve (N. ilio-inguinalis) . 



(d) Lateral cutaneous nerves (rami cutanei later ales of Nn. inter- 



costales). 



(e) Lateral cutaneous ramus of twelfth thoracic nerve (ramus cutaneus 



lateralis N. thoracalis XII.} (0. T. iliac branch of last dorsal 

 nerve). 



(/) Lateral cutaneous ramus of iliohypogastric nerve (ramus cutaneus 

 lateralis N. iliohypogastrici) (0. T. iliac branch of iliohypo- 

 gastric). 



Deep Fascia (Fascia profunda). 



Remove the superficial and expose the deep fascia. Compare 

 the latter with the superficial. Does it contain fat! Does it 

 contain blood-vessels and nerves'? 



Muscles of Abdomen (Musculi abdominis). (Cf. Fig. 6.) 



Remove the deep fascia, keeping the muscles tense and using 

 a belly-bladed scalpel in the dissection of the fibres. Expose the 

 underlying muscles. Make drawings of each muscle as exposed. 

 Study its form, position, origin, insertion, action, and nerve- 

 supply. 



(a) External oblique muscle of abdomen (M. obliquus abdominis ex- 

 ternus). 



Find the lumbar triangular space (trigonum lumbale 

 [Petiti]). What is the relation of the muscle to the inguinal 

 ligament of Poupart (lig amentum inguinale [Pouparti])1 The 

 reflection of this ligament should be carefully studied. Study 

 especially Gimbernat's ligament (lig amentum lacunare [Gim- 

 bernati]), the reflex ligament of Colles (tigamentum reflexum 

 [Collesi]) (0. T. triangular fascia). Both these structures will 

 be frequently referred to. Note the opening just lateral to the 

 tuberculum pubicum, the " subcutaneous inguinal" or " exter- 

 nal abdominal" ring (annulus inguinatis subcutaneus). What 

 structures pass through it in the male? In the female! (See 

 Spalteholz, vol. ii., Fig. 317.) 



In connection with the annulus inguinalis subcutaneus, 

 study 



(aa) Superior pillar (crus superius). 



(ab) Inferior pillar (crus inferius). 



Dissect out carefully the fibres passing between the two 

 crura (fibrae intercrurales) ; expose the fascia descending 



