THE MUSCLES. 179 



long, (internally), and peronseus long., and brevis (without), 

 covers thejibula, lig. inteross., artic. tibio-tarsalis, m. pediaeus, 

 and the toes. Or. : condylus externus tibiae : inner surface of 

 fibula, (four-fifths ;) lig. interosseum. Ins. : Phalanx II. and 

 ///. of the second to the fifth toe. Each of the four tendons is 

 fissured into three portions, the two lateral of which go to the 

 third phalanx, the central to the basis of the second phalanx. 

 Use : extends the third phalanx of the second, third, fourth, and 

 fifth toes. 



369. 3. Peronasus anticus s. tertius. 



Pos. : on the outer side of the anterior surface of the leg (infe- 

 rior third) ; between 3. and peronseus brevis. Or. : inferior half 

 of fibula (anterior internal surface). Ins.: Basis oss. V. meta- 

 tarsi. The tendon passes obliquely outwards under lig. cruciat., 

 over the back of the foot. Use : to flex the foot, and raise it 

 rather outwards. 



Nerves for 1. to 4. : peroneus profwndus [tibialis ant^\. 



b. On the outer surface. 



370. 5. Peronasus longus (s. primus). 



Pos.: under the skin of the peronaeal region, along the fibula; 

 in front, separated by a fascia from extens. digitor. longus, be- 

 hind and above from soleus, below from flex, halluc. long.; 

 covers peronseus brevis externally. In the foot the tendon lies 

 between skin and os calcanei, in the sole it is covered by the soft 

 parts. Or. : capitulum and superior third of external surface of 

 fibula (by two heads) ; the inferior as low as the inferior fourth. 

 Ins. : Basis oss. I. metatarsi. Its tendon passes round the ex- 

 ternal malleolus, in a groove (also with the following muscle), 

 curves forwards and downwards to the outer border of calcaneus, 

 and passes once again curved in the groove of the os cuboid, ob- 

 liquely forwards and inwards into the sole of the foot, to thejirst 

 cuneiform and first bone of metatarsus. Use : extends the foot and 

 draws the external border outwards and upwards. (In fractures 

 of the fibula the talus therefore passes inwards the outer mal- 

 leolus more prominently outwards dislocation inwards.) 



371. 6. Peronseus brevis (s. secundus). 



Pos. : under the last muscle, covers fibula above, on the ante- 

 rior, below, on the posterior angle, in the centre upon the outer 

 surface. Before it peron. 3., behind it peron. long, and flexor, 

 hallucis long. Or. : external surface of the fibula (inferior third). 

 Ins. : the tendon passes forwards in the groove of the external 

 malleolus upon the calcaneus, over tendo. peron. longi and os 



