710 MR. T. MANNERS-SMITH ON THE [Dec. 4. 



ficial extensor is supplied by the same nerve which supplies the 

 extensor indicis. There is a distinct extensor for second digit 

 arising from upper expanded extremity of fibula, from head of bone, 

 and from a tendinous band between these two points ; it is 

 supplied by a slender branch from the peroneal nerve. It will be 

 noticed that index receives three tendons — one from superficial 

 extensor, one from deep, together with a special extensor. 



Tibialis anticus. — Arises by two heads : a superficial from upper 

 expanded extremity of fibula, from a strong tendinous band 

 passing from fibula to patella, from patella itself, and from tibia. 

 The deep head from shaft of tibia. It is inserted into ento-cunei- 

 form. Both heads are supplied by a nerve from the front of the 

 thigh, which passes beneath the above-mentioned tendinous band. 



Peroneus longus. — Arises from the upper expanded extremity of 

 the fibula. Passing down the outer side of the leg, it reaches the 

 interval between the large os calcis and the cuboid, and passes 

 deeply into the sole of the foot, traverses the sole, and is inserted 

 in the usual situation. It is supplied by the peroneal nerve. 



Peroneus brevis. — Arises beneath longus from the expanded 

 extremity of fibula. Its tendon divides below into two slips, one 

 passing to first, the other to second phalanx of fifth toe. It is 

 supplied by the peroneal nerve. Coues describes this as peroneus 

 tertins. Its origin and nerve-supply would rather correspond to 

 that of brevis. 



Myology of Pes. 



Of the muscles of the big toe, flexor brevis hallucis is the only 

 one which can be made out, and this is extremely small. 



Of muscles of the litttle toe, the flexor brevis, the adductor, 

 and the abductor, and a small abductor minimi digiti can be made 

 out. 



Plantar and dorsal inter-ossei are also present. 



Plexuses. 



Brachial plexus. — This is formed by the fifth, sixth, seventh, 

 eighth cervical and first dorsal nerves. There is a small filament, 

 in addition, from the fourth cervical, and the first dorsal receives a 

 small branch from the second. The plexus consists of two main 

 trunks— an upper and a lower. The fifth and sixth unite and 

 form the upper trunk. Immediately beyond the formation of this 

 trunk two nerves arise : one passes upwards and forwards and, 

 joining the branch to the plexus from the fourth cervical nerve, it 

 is distributed to the so-called infra-spinatus muscle ; the other 

 nerve passes downwards and backwards and forms one head of 

 median. The trunk itself passes backwards in a somewhat similar 

 manner to the circumflex of human anatomy, gives off a branch 

 to suhscapularis, and divides into two parts — one passes into fore- 

 arm and supplies the skin on the outer posterior aspect of the 



