MUSCLES OF THE PELY1C LIMBS. 209 



medial surface of the distal end of the tibia. This groove is 

 converted into a canal by a transverse ligament. Beyond the 

 canal the tendon turns onto the plantar surface of the foot and 

 passes through a groove on the ventral surface of the scaphoid 

 bone. It then divides. 



Insertion into the outer tuberosity on the surface of the 

 scaphoid, and onto the proximal end of the ventral surface of 

 the medial cuneiform. 



Relations. Outer and medial surface with the flexor longus 

 digitorum (). Lateral surface with the flexor longus hallucis (;//). 



Action. Extensor of the foot. 



B. MUSCLES ON THE DORSAL AND LATERAL SURFACES 

 OF THE LOWER LEG. M. peroneus longus (Fig. 90, g}. 

 A slender, fusiform muscle lying superficially on the lateral side 

 of the leg, dorsad of the soleus. 



Origin by tendon-fibres from the lateral surface of the head 

 of the fibula and from the proximal half of the lateral surface 

 of its shaft. 



At the junction of the middle and distal thirds of the lower 

 leg the muscle ends in a slender tendon which passes through 

 the groove on the lateral surface of the lateral malleolus. This 

 groove is converted into a canal by a transverse ligament. 

 The tendon passes through the groove on the peroneal tubercle 

 of the calcaneus, then turns onto the sole of the foot and passes 

 through the peroneal groove on the cuboid bone. It then turns 

 mediad and passes through the groove between the ventral 

 processes of the lateral cuneiform and the metatarsal until it 

 reaches the first metatarsal. The entire groove is converted 

 into a canal by the overlying ligaments. 



Insertion into (i) the base of the fifth metatarsal, and (2) 

 the outer side of the base of the first metatarsal, and (3) by 

 slender branches into the bases of the other metatarsals. 



Relations. Outer (lateral) surface with the superficial fascia 

 and the tendon of the biceps femoris. Inner surface with the 

 peroneus tertius (r) and peroneus brevis (s), and with the 

 extensor longus digitorum (/). At the proximal end the 

 dorsal border touches the tibialis anterior (). 



Action. Flexor of the foot. 



