MUSCLES OF THE RIGHT INFERIOR LIMB 69 



50a. Peroneus longus anterior m.: Lateral condyle of the 

 tibia and ligaments of knee; to proximal end of second metatar- 

 sal. Everts and extends foot. The inserting tendon of this 

 muscle begins about the middle of the crus, extends along the 

 lateral side of the tarsus to the proximal end of the fifth metatar- 

 sal then traverses the foot to its insertion. This muscle lies 

 under the caudal margin of the anterior tibial m. (47), caudad to 

 the extensor digitorum longus m. (49) and between it and the 

 peroneus longus posterior m. (506). Method: To demonstrate 

 the insertion of this muscle transect the tendons of the plantaris 

 m. (45) and flexor digitorum longus m. (46) in the plantar 

 region of the foot, but at different levels; then follow the tendon 

 across the foot at the tarsometatarsal articulations to the base 

 of the second metatarsal. Transect near the origin. 



5o5. Peroneus longus posterior m.: Lateral condyle of 

 tibia, fibula and fascia of knee mainly; to proximolateral side of 

 first phalanx of fifth digit, also attached to fourth digital tendon 

 of extensor digitorum longus m. (49) dorsad to fifth metatarsal. 

 Extends and abducts fourth and fifth digits. 



50c. Peroneus brevis m.: Lateral condyle and proximal 

 third of shaft of tibia laterad of the crest; to proximolateral 

 tuberosity of fifth metatarsal (Fig. 17, PT). Extends fifth 

 metatarsal. The proximal third of this muscle lies under the 

 extensor digitorum longus m. (49) . 



50 J. Peroneus tertius m.: Fibula mainly; to proximolateral 

 side of first phalanx of fourth digit. Abducts and extends digit 

 and helps to flex foot. The proximal part of this muscle is 

 intimately fused with the plantaris m. (45) and peroneus 

 longus posterior m. (506). 



