AND PHYSIOLOGY. 



335 



four lower cervical and upper dorsal nerves, and they give off 

 their branches to the upper part of the body. The lumbar 

 plexus is made up of the last dorsal nerve and the five lumbar 

 nerves ; and the sacral plexus of a branch of the last lumbar 

 and the upper sacral nerves. These supply the portions of 

 the body below the loins, and the superficial parts of the body 

 between the loins and upper part of the chest. 



Fig. 323. Fig, 324. 



A View of the Branches of the Ischiati* 

 Plexus to the Hip and Back of the Thigh. 

 1, 1, Posterior Sacral Nerves. 2, Nervi 

 Glutei. 3, The Internal Pudic Nerve 

 (Nervus Pudendalis Longus Superior). 4, 

 The Lesser Ischiatic Nerve, giving; off the 

 Perineal Cutaneous (Pudendalis Longus 

 Inferior), and 5, The Ramus Femoralis 

 Cutaneous Posterior. The reference to the 

 Great Ischiatic has been omitted. It is 

 seen to the right of 3. 



A View of the Anterior Crural Nerve 

 and Branches. 1, Place of emergence of the Nerve under Poupart's Ligament. 2, 

 Division of the Nerve into Branches. 3, Femoral Artery. 4, Femoral Vein. 5, 

 Branches of Obturator Nerve. 6, Nervus Saphenus. 



Describe the lumbar and sacral plexus. 

 15 



