56 THE POCKET ANATOMY 



POSTERIOR TIBIO-FIBULAR REGION, DEEP LAYER. 



The FASCIA of the leg invests the limb except where the 

 inner surface of the tibia is subcutaneous ; it is continuous 

 above with the fascia lata of the thigh, and below with the 

 annular ligaments of the ankle, being attached in front to 

 the anterior and inner borders of the tibia, and to the antero- 

 and postero-external borders of the fibula, forming inter- 

 muscular septa. 



Popliteus : anterior half of impression on external surface 

 of outer condyle(T), posterior ligament of knee-joint(p) 

 triangular space on posterior surface of shaft of tibia above 

 oblique line(p) (Internal popliteal). [Flexes knee and rotates 

 leg inwards.] Forms floor of popliteal stace ; arises in capsule of 

 joint but outside synovial membrane. 



Flexor longus hallucis : lower of posterior surface of shaft 

 of fibula, intermuscular septum (F) base of last phalanx of 

 great toe(x) (Posterior tibial). [Extends ankle, flexes tarsal 

 joints and joints of great toe.] Grooves astragalus. 



Flexor longus digitomm : inner part of posterior surface 

 of shaft of tibia, from oblique line to 3 inches from lower end, 

 aponeurosis over tibialis posticus(F) four tendons, joined by 

 flexor accessorius, passing through slits in tendons of flexor 

 brevis digitorum, to bases of last phalanges of four outer toes 

 (T) (Posterior tibial). [Extends ankle, flexes joints of tarsus 

 and four outer toes.] 



Tibialis posticus : posterior surface of interosseous mem- 

 brane except below, and aponeurosis superficial to muscle, 

 external part of posterior surface of tibia from head to 2 inches 

 from lower end, internal surface of shaft of fibula(r) 

 tubercle on scaphoid bone, slips to cuneiform, cuboid, bases 

 of and, 3rd, and 4th metatarsals, and sustentaculum tali(T) 

 (Posterior tibial). [Extends ankle, flexes and supports tarsal 

 joints, inverts foot.] 



FIBULAR REGION. 



Peroneus longus : upper | external surface of shaft of fibula, 

 fascia, intermuscu lar septum(p) outer part of plantar sur 

 face of internal cuneiform and of base of ist metatarsal(T ) 

 (Musculo-cutaneous). [Extends ankle-joint and everts foot.] 

 Winds round grooves behind external malleolus and outer border of 

 cuboid bone. 



Peroneus brevis : lower $ external surface shaft of fibula, 

 intermuscular septum(F) projection at base of 5th meta- 

 tarsal(x) (Musculo-cutaneous). [Extends ankle-joint and 

 everts foot.] 



