Zooloyical Society. 231 



Peroneiis longus. — Origin : tendinous from the head of the tibia, 

 and by carneous fibres from the upper half of the anterior margin of 

 the tibia ; these fibres pass obUquely to a marginal tendon, which 

 becomes stronger and of a rounded form where it leaves the muscle. 

 The tendon gives otf a broad, thin, aponeurotic sheath to be inserted 

 into the capsule of the tarsal joint ; it is tlien continued through a 

 synovial pulley on the side of the outer malleolus, and is finallj' in- 

 serted or continued into the perforated tendon of the middle toe. 



Tibialis anticiis. — This muscle is overlapped and concealed by the 

 peroneus ; it arises partly in common with that muscle, and partly 

 by separate short tendinous threads from the outer part of the head 

 of the tibia ; it gradually becomes narrower, and finally tendinous 

 two-thirds of the way down the leg ; its strong tendon glides 

 through the oblique pulley in front of the distal end of the tibia, 

 expands as it passes over the ankle-joint, and is inserted into the 

 anterior part of the proximal end of the tarso-metatarsal bone, sending 

 off a small tendinous slip to the aponeurosis covering the extensor 

 tendons of the toes, and a strong tendon which joins the fibular side 

 of the following muscle. 



Extensor longus digit orum. — This lies between the tibialis anticiis 

 and the front and outer facet of the tibia, from which it derives an 

 extensive origin ; its tendon commences half-way down the leg, runs 

 along the anterior part of the bone, first under the broad ligamentous 

 band representing the anterior part of the annular ligament, then 

 through a ligamentous pulley, and inclines to the inner or tibial side 

 of the anterior surface of the metatarsal bone, where it expands and 

 divides into three tendons. Of these the innermost is given off first, 

 and subdivides into two tendons, one of which goes to be inserted into 

 the base of the last phalanx of the second toe ; the other portion is 

 principally inserted into the middle toe, but also sends off a small 

 tendon to the inner side of the proximal phalanx of the second toe. 

 The second tendon is inserted by distinct portions into the second, 

 third and last phalanges of the middle toe. The third tendon supplies 

 the outer toe. 



Extensor brevis digitorum. — A small extensor muscle arises from 

 the insertion of the tibialis anticus, and sends its tendon to the outer 

 side of that of the great extensor digitorum. 



Extensor poUicis brevis. — An extensor of the small innermost toe 

 arises from the upper and inner side of the tarso-metatarsal bone. 



Flexor perforans digitorum. — This strong penniform muscle arises 

 fleshy from nearly the whole of the outer surface of the fibula, also 

 from the posterior part of the tibia and the interosseous space ; the 

 tendon of the biceps perforates its upper part in passing to its in- 

 sertion. It ends in a strong flat tendon at the lower third of the 

 leg, which tendon runs through a particular sheath at the back part 

 of the tarsal pulley, becomes thickened and expanded as it advances 

 forwards beneath the tarsus, receives a strong accessorial tendon 

 from the muscle which bends the innermost toe, and finally divides 

 into three strong perforating tendons, which bend the last joints of 

 the three long toes. 



In the outer, or fourth toe, both the perforans and per/oralus ten- 



