POSTERIOR PART OF LOWER EXTREMITY. 



387 



8. The fourth layer of muscles: Dorsal interossei, four in number; plantar 

 interossei, three in number ; the nerve- and blood-supply to these. (Fig. 275.) 



9. The tendon of tJic pcroncus longus and its sesamoid bone. (Fig. 275.) 

 Incisions. Start at the middle of the os calcis and make one cut through the 



skin to the middle of the great toe ; the other to the middle of the little toe. 

 This V-incision will permit you to find : 



i. The plantar cutaneous nerve, a branch of the posterior tibial nerve. 



Abductor hallueis 



Flexor brevis digitorum 



INTERNAL PLANTAR 



NER YE 

 Internal plantar artery 



BRANCH OF INTER- 

 NAL PLANTAR 

 NERVE TO INNER 

 SIDE OF HALL UX 



Abductor minimi digit! 



External plantar artery 



EXTERNAL PLANTAR 



NER VE 



Ligameuta vaginales 



DIGITAL COLLATERAL 

 BRANCHES OF EX- 

 TERNAL PLANTAR 



DIGITAL COLLATERAL 

 BRANCHES OF INTER. 

 NAL PLANTAR 



FIG. 272. SUPERFICIAL XKKVES IN THE SOLE OF THE FOOT. (Ellis.) 

 (In this dissection the greater part of the plantar fascia has been removed.) 



(Fig. 272.) This is a sensory nerve to the heel, and you will find it in the thick 

 pad of fat in the superficial fascia. Sometimes the granular fat here is three- 

 fourths of an inch thick. 



2. The cutaneous branches of the internal and external plantar vessels 

 and nerves. Exercise now your common sense in removing the skin. 



The superficial fascia contains much fat. The fat found in the palms of the 

 hands, in the soles of the feet of the adult, and all over the body of the child at 



