210 ANATOMY IN A NUTSHELL. 



tciic muscle is supplied by this nerve, it also sends branches to the integument 

 of the scrotum in the male or the major lip in the female. The internal or 

 crural branch passes beneath Poupart's ligament on the outer side of the 

 femoral artery. It pierces the fascia lata to supply the integument in the 

 middle of the upper third of the thigh. 



The third nerve of the lumbar plexus is the external cutaneous, which 

 conies from the second and third lumbar nerves. After passing from the outer 

 border of the Psoas magiius muscle it crosses the Iliacus muscle, prior to this 

 it pa>ses behind the caecum on the right side and the iliac colon on the left. 

 Below the anterior superior spine of the ilium it passes under Poupart's liga 

 iniiii in the outer border of Scarpa's triangle. It now crosses in front of the 

 Sartorius muscle where it divides into two branches, an anterior and a posterior 

 brunch. Tin: anterior BRANCH, after passing in the deep fascia for about 

 four inches, becomes cutaneous, and most always divides into an external 

 branch which supplies the skin of the lower half of the outer side of the thigh. 

 and an internal branch which is distributed to the skin of the outer side of the 

 front of the thigh as far as the knee. The posterior branch supplies the in- 

 tegument of the outer side of the thigh from the greater trochanter to the middle 

 of the thigh. 



The patellar plexus is formed by branches from the long saphenous and 

 internal cutaneous and middle cutaneous, and external cutaneous. 



LESSON LVII. 

 Tlu fourth nerve of the lumbar plexus is the anterior crural, which is the 

 largesl n< rve of this plexus. It comes from the anterior branches of the sec- 

 ond, third, and fourth nerve, and after passing through the outer border of the 

 Psoas magnus muscle, it passes tinder Poupart's ligament in a groove between 

 the Psoas magnus and Iliacus muscle into Scarpa's triangle. In this triangle 

 it lit s io the outer side of the femora! artery from which it is separated by part 

 of the P>o;i> magnus. Hue it divides into superficial and deep branches, be- 

 twi i n which pass< s die external circumflex artery. The superficial branches 

 supply the Pectineus and Sartorius muscle and give off two cutaneous branches, 

 middle and internal. The deep branches supply the Iliacus. the Rectus 

 femoris, Vastus interims. Vastus externus, Crueus and Subcrureus muscle, and 

 gives off the internal or long saphenous nerve which is cutaneous. This an- 

 terior crural nerve passes to eight muscles, all the muscles on the front of the 

 leg except tin Tensor fascia femoris, and in its place it supplies the Iliacus of 

 the deep abdominal region. It supplies the Pectineus of the internal femoral 

 region. The nerve to the Pectineus passes behind the femoral sheath and in 

 fiont of the Psoas magnus to end in the anterior surface of the Pectineus. The 

 nerve to the Sartorius ends in the upper part of the muscle. The middle 



< utaneoi - \i u\ i; divides into two branches, the outer one of which pierces the 

 Sartorius and it together with the inner branch becomes cutaneous at the upper 

 third of the thigh, and the two pass down as far as the knee-joint where they 



< nt( r into the patellar plexus. Tin; internal cutaneous branch divides into 

 an ai i d post< rior division and supplies integument on the inner side of 



