DISSECTING MANUAL. 



sheaths and tissues of the web ; a band runs forward on each 

 side of the toe to the side of the metatarso-phalangeal joint and 

 base of the first phalanx; bands (superficial transverse meta- 

 tarsal ligament} of transverse fibres connect these slips as they 

 separate; an intermuscular septum ascends from the central 

 portion on each side of the Flexor brevis digitorum. On the toes 

 the digital sheaths are arranged as on the fingers ; vaginal liga- 

 ments occur over the first and second phalanges. [378] 



MUSCLES. 

 Front of Leg and Dorsum of Foot. 



Tibialis Anticus. Origin; upper two-thirds of outer surf ace 

 of tibia; interosseous membrane; fascia over it; intermuscu- 

 lar septum externally. Course of tendon; through special 

 compartments under both parts of anterior annular ligament, 

 in a separate synovial sheath. Insertion; internal cuneiform; 

 base of first metatarsal. [378] 



Extensor Longus Digitorum. Origin, outer side of ex- 

 ternal tuberosity of tibia; upper two-thirds, or more, of an- 

 terior surface of fibula; fascia over it; intermuscular septa on 

 either side. Course of tendon; under anterior annular liga- 

 ment, running under the lower part in a separate compartment 

 with the Peroneus tertius and with a special synovial sheath; 

 dividing in front of ankle into four tendons. Insertion; into 

 four outer toes in same way as corresponding tendons in hand 

 (see page 174). It forms membranous expansions on the 

 dorsum of the first phalanges, which are joined by the tendons 

 of the Extensor brevis digitorum, Lumbricales, and Interossei; 

 the expansions separate into a central and two lateral slips, 

 which are attached respectively to the middle and terminal 

 phalanges of the toes. [379] 



Peroneus Tertius (a separated portion of the preceding). 

 Origin; anterior surface of fibula; intermuscular septum ex- 

 ternally. Course; with preceding. Insertion ; dorsal aspect of 

 base of fifth metatarsal. [380] 



[294] 



