172 LABORATORY MANUAL OF HUMAN ANATOMY 



from the tibia and fibula. In the lower forms, such as the rabbit 

 and kangaroo, this primitive undivided mass of flexors is the 

 rule. 



Arteries. (Vide Fig. 70, and also Spalteholz, Fig. 478.) 



Trace the popliteal artery downward, and note that it bifurcates 

 just anterior to the arcus tendineus M. solei into the anterior and 

 posterior tibial arteries. The anterior tibial has already been dis- 

 sected. Trace out the course of the posterior tibial artery. Determine 

 the course and position of its linear guide. Where would you take 

 the pulse in the leg and foot? Study 

 (a) Posterior tibial artery (A. tibialis posterior}. 



(aa) Fibular branch (ramus fibularis). 



(ab) Peroneal artery (A. peronaea). 



(1) Nutrient artery of the fibula (A. nutricia fibulae). 



(2) Perforating branch (ramus perforans). 



(3) Communicating branch (ramus communicans) . 



(4) Lateral posterior malleolar artery (A. malleolaris 



posterior lateralis). 



(5) Lateral calcanean branches (rami calcanei later ales). 



(ac) Nutrient artery of the tibia (A. nutricia tibiae). 



How are the nutrient arteries of the lower extremities 

 directed ? 



(ad) Medial posterior malleolar artery (A. malleolaris posterior 



medialis) (0. T. internal malleolar). 



(ae) Medial calcanean branches (rami calcanei mediates). 



(af) Network of heel (rete calcaneum). 



The terminal branches of the A. tibialis posterior will 

 be found when the dissection of the foot is made. 



Trace out the veins accompanying this artery and de- 

 termine their anastomoses and the large veins into which 

 they empty. 



Nerves. (Spalteholz, Fig. 823.) 

 (a) Tibial nerve (N. tibialis). 



(aa) Muscular branches (rami muscular es). 



(ab) Interosseous nerve of the leg (N. inter osseus cruris). 



(ac) Medial cutaneous nerve of the calf (N. cutaneus surae 



medialis). This nerve has already been dissected. It 

 unites with the ramus anastomoticus peronaeus to form 

 the 



(ad) Nerve of the calf (N. suralis). 



(ada) Lateral calcanean branches (rami calcanei lat- 



erales). 



(adb) Lateral dorsal cutaneous nerve of the foot (N. 



cutaneus dorsalis lateralis pedis). This nerve 

 is the continuation of the N. suralis into the 

 foot. Review at this stage of the dissection the 

 cutaneous nerve supply of the dorsum of the 

 foot. 



(ae) Medial calcanean branches (rami calcanei mediales) . 



Dissect out the branch passing into the syndesmosis 

 tibiofibularis. Do you find any branches accompanying 

 the A. tibialis posterior? 



