the Tibialis anterior by a splitting of its fibers. The other limb extends downward 

 and medialward, to be attached to the border of the plantar aponeurosis, and passes 

 over the tendons of the Extensor hallucis longus and Tibialis anterior and also 

 the vessels and nerves. 



Laciniate Ligament (ligamentum laciniatum; internal annular ligament). The 

 laciniate ligament is a strong fibrous band, extending from the tibial malleolus 

 above to the margin of the calcaneus below, converting a series of bony grooves 

 in this situation into canals for the passage of the tendons of the Flexor muscles 

 and the posterior tibial vessels and tibial nerve into the sole of the foot. It is 

 continuous by its upper border with the deep fascia of the leg, and by its lower 

 border with the plantar aponeurosis and the fibers of origin of the Abductor 

 hallucis muscle. Enumerated from the medial side, the four canals which it forms 

 transmit the tendon of the Tibialis posterior; the tendon of the Flexor digitorum 

 longus ; the posterior tibial vessels and .tibial nerve, which run through a broad 

 space beneath the ligament; and lastly, in a canal formed partly by the talus, the 

 tendon of the Flexor hallucis longus. 



Tibialis antenor 

 Tibialis posterior 



Flexor dig. longus 

 Ext. hall. lony. 





Flexor hallucis longus 



Bursa 



Tendocalcaneus 

 FIG. 442. The mucous sheaths of the tendons around the ankle. Medial aspect. 



Peroneal Retinacula. The peroneal retinacula are fibrous bands which bind 

 down the tendons of the Perona?i longus and brevis as they run across the lateral 

 side of the ankle . The fibers of the superior retinaculum (external annular ligament) 

 are attached above to the lateral malleolus and below to the lateral surface of the 

 calcaneus. The fibers of the inferior retinaculum are continuous in front with those 

 of the cruciate crural ligament; behind they are attached to the lateral surface of 

 the calcaneus; some of the fibers are fixed to the peroneal trochlea, forming a septum 

 between the tendons of the Peronsei longus and brevis. 



The Mucous Sheaths of the Tendons Around the Ankle. All the tendons crossing 

 the ankle-joint are enclosed for part of their length in mucous sheaths which have 

 an almost uniform length of about 8 cm. each. On the front of the ankle (Fig. 441) 

 the sheath for the Tibialis anterior extends from the upper margin of the trans- 

 verse crural ligament to the interval between the diverging limbs of the cruciate 

 ligament; those for the Extensor digitorum longus and Extensor hallucis longus 

 reach upward to just above the level of the tips of the malleoli, the former being 

 the higher. The sheath of the Extensor hallucis longus is prolonged on to the base 

 of the first metatarsal bone, while that of the Extensor digitorum longus reaches 





