I04 ELEMENTS OF MAMMALIAN ANATOMY 



(8i) Flexor brevis digitorum (Fig. 52) {pedis perforaius); 

 continuation of tendon of plantaris to base of second phalanges; 

 each tendon is spHt at the proximal phalanx to transmit a 

 tendon of the flexor longus digitorum; flexor of second phalanges 

 of digits. 



(82) Soleus (Figs. 50, 59); lateral surface of head and ventral 

 surface of fibula to tuberosity of os calcis; helps to form the 

 tendon of Achilles (tendo calcaneus) and the sheath for the 

 tendon of the plantaris; extensor of foot. 



(83) Popliteus (Fig. 49); lateral epicondyle of femur to 

 proximal end of ventral surface of tibia; rotator of thigh. 



It will be necessary to remove the deep crural fascia from the 

 ventral surface of the shank in order to study the following 

 three muscles. 



(84) Flexor longus hallucis (Fig. 59); from crural fascia, 

 ventral surface of tibia, medial surface and head of fibula to 

 bases of the terminal phalanges; the four tendons perforate the 

 four tendons of the flexor brevis; flexor of phalanges. 



(85) Flexor longus digitorum (Fig. 59) ; mediocaudal surface 

 of middle third of tibia and head of fibula to join with tendon of 

 flexor hallucis longus. 



(86) Tibialis posterior ; from caudal aspect of proximal third 

 of tibia and head of fibula to plantar surface of internal cunei- 

 form; extensor of foot. 



MUSCLES OF DORSAL AND LATERAL SURFACES 



OF SHANK 



(87) Peroneus longus (Fig. 52); head and shaft of fibula to 

 bases of fifth and first metatarsals and slender branches to 

 other metatarsals; flexor of foot. 



(88) Peroneus brevis (Fig. 53) ; lateral surface of distal half of 

 fibula to base of fifth metatarsal; extensor of foot. 



(89) Peroneus tertius (Fig. 53); lateral surface of proximal 

 half of fibula to lateral border of extensor tendon of fifth digit; 

 extensor and abductor of fifth digit, and flexor of foot. 



