THE SACRAL PLEXUS 



179 



The Peromzus Longus arises from the lateral aspect of the fibula and 

 descends behind the lateral malleolus. It then passes forwards on the 

 lateral aspect of the calcaneus below the trochlear process (peroneal 



A B 



FIG. 73. The Nerve-supply of the Skin on the Anterior Aspect 

 of the Lower Limb. 



A. The individual nerves of supply. 



B. The segmental supply. 



1. Lateral cutaneous nerve. 



2. Lumbo-inguinal nerve (crural branch 



of genito-crural nerve). 



3. Intermediate (middle) and medial 



cutaneous nerves. 



4. Obturator nerve. 



5. Lateral sural nerve. 



6. Saphenous nerve. 



7. Superficial peroneal(musculo-cutaneous) 



nerve. 



8. Medial branch of deep peroneal (an- 



terior tibial) nerve. 



tubercle), and, entering a groove on the plantar aspect of the cuboid, it 

 passes across the sole of the foot to be attached to the base of the first 

 metatarsal and the adjoining portion of the medial cuneiform bone. It 

 bridges across the extremities of the transverse arch of the foot, and so 

 constitutes a strong support (p. 176). 



