364 ME. J. BESWICK PEEEIN ON THE 



inserted by a slender tendon, which passes beneath the anterior annular ligament into 

 the fibular side of the base of the innermost metatarsal bone. 



The extensor longus hallucis (PI. LXV. fig. 2) is closely associated with the pre- 

 ceding muscle. It arises by a pointed tendinous process from the outer aspect of the 

 head of the tibia. It is fusiform in shape, and terminates in a slender tendon which 

 passes underneath the annular ligament with the tendon of the preceding muscle, and is 

 inserted by its side into the base of the inner metatarsal bone and shaft. 



The extensor longus digitoruni (PI. LXV. fig. I, 2) is situated behind and on a deeper 

 plane than the tibialis anticus. It springs fi-om the upper and anterior half of the tibia, 

 also from its head and median tubercle. An inch above the ankle-joint it terminates in 

 a slender tendon which passes underneath the anterior annular ligament, traverses the 

 metatarsus as a single tendon as far as the phalangeal bases, where it undergoes an 

 increase in size, and then divides into three tendons, which are distributed to the three 

 outer digits. The middle one is the longest and strongest tendon. All pass to the 

 bases of the distal phalanges. Opposite the ankle-joint the tendon passes through the 

 tibial intertrochlear groove, and then crosses behind the tendons of the tibialis anticus 

 and extensor proprius hallucis. 



The extensor brevis digitorum (PI. LXV. fig. 2, 11, 12) is a powerful muscle consisting 

 of an outer and an inner portion. The outer arises from the whole length of the dorsal 

 aspect of the outer metatarsal bone, and from the proximal third of the external surface 

 of the inner metatarsal. Opposite the distal extremities of the metatarsals it divides 

 into two short tendons, which pass to be inserted into the dorsal aspect of the bases of 

 the first phalanges of the 2nd and 3rd digits. The imier portion arises by a pointed 

 process from the inner metatarsal bone. It terminates in a single tendon, which 

 is inserted into the base of the first phalanx of the 2nd digit, more internal than the 

 preceding. 



This muscle partakes more of the character of an interosseous than a legitimate 

 extensor brevis digitorum. 



On the tibial side of the extensor brevis are two other muscles — a long, and a short 

 one. The long one arises from the base of the inner metatarsal bone by fleshy fibres. 

 It terminates opposite the lower thii'd of the metatarsus in a moderately strong tendon, 

 which passes obliquely forwards to the extensor aspect, as far as the base of the distal 

 phalanx. It is the only long extensor tendon to this digit. The short muscle arises 

 from the lower half of the tibial side of the inner metatarsal bone, and is inserted into 

 the base of its first phalanx on its extensor aspect. The position of this digit is exactly 

 the reverse of that of the 2nd, 3rd, and 4th digits. 



The rudimentary aponeurotic plantar expansion, analogous to the plantar fasciae, sends 

 a slip to the tibial side of the base of the first phalanx superficial to the preceding 

 muscle. 



On the outer side of the 1st digit is a small opponens muscle (interosseus). It arises 



