168 MUSCLE TISSUE 



IHToneus brevis; insertion, upper surface of the base 

 of the fifth metatarsal, sometimes the fourth. This 

 muscle is peculiar to man. 



The Fibular or Peroneal Region. Peroneus Long us.-- 

 Origin, head and upper two-thirds of the external 

 surface of the fibula, fascia of the leg, and septa on 

 each side. Tendon begins in the lower half of the leg, 

 passes behind the external malleolus; then forward on 

 the outer side of the os calcis, winds around the tuber- 

 osity of the cuboid, and enters its groove, crosses the 

 sole obliquely, and is inserted into the outer side of 

 the tuberosity of the first metatarsal, and slightly 

 into the internal cuneiform; a frequent offset to the 

 base of the second metatarsal and first dorsal inter- 

 osseous. 



Peroneus Brevis. It lies deeper than the peroneus 

 longus. Origin, lower two-thirds of the external surface 

 o'f the fibula from the septa and a flat tendon on the 

 surface turned toward the bone; insertion, tuberosity 

 at the base of the fifth metatarsal, sending a small slip 

 to the outer edge of the extensor of the little toe or 

 forepart of the metatarsal bone. 



The Posterior Tibiofibular Region (Flexors). Super- 

 ficial Muscles. Gastrocnemius. Gastrocnemius has 

 two large heads from the femur, terminating at the 

 middle of the leg in a common tendon. Outer head 

 from the depression on the outer side of the external 

 condyle above the tuberosity, and from the posterior 

 surface of the femur just above that condyle. Inner 

 head from the upper part of the internal condyle. 

 The two heads join with the soleus and are inserted 

 into the tendo Achillis. 



Soleus. Origin, externally from the posterior sur- 

 face of the head and upper third of the shaft of the 

 fibula; internally, oblique line and inner border of the 

 tibia to its middle, and from a tendinous arch over 

 the popliteal vessels and nerve; fibers rise to a large 

 extent from two tendinous laminae which descend 



