238 MYOLOGY, OR ANATOMY OF MUSCULAR SYSTEM 



outer side of the base of the first phalanx of the great toe, 

 somewhat above the tendon of the peroneus longus. 



Caput transversum (transversus pedis] is covered by flexor 

 tendons. Origin, inferior tarsometatarsal ligaments of the 

 three outer toes and transverse metatarsal ligaments; inserted 

 with the oblique head and flexor brevis into the first phalanx 

 of the great toe and extensor tendon. 



The External Group. 1. M. Abductor Minimi Digit i. Origin, 

 both tubercles of the os calcis, external septum, band of the 

 plantar fascia between the external tubercle and base of the 

 fifth metatarsal; inserted into the base of the fifth metatarsal 

 and outer side of the base of the first phalanx of the little 

 toe. The tendon usually receives muscle fibers from the base 

 of the fifth metatarsal. 



2. M. Flexor Brevis Minimi Digiti. Origin, base of the fifth 

 metatarsal, and calcaneocuboid ligament, sheath of the peroneus 

 longus; insertion, base and external border of the first phalanx 

 of the little toe; deeper fibers generally end on the anterior half 

 of the fifth metatarsal. 



The Interossei Muscles 



Mm. intcrossei, as in the hand, are seven in number, four 

 dorsal and three plantar. The dorsal project downward as 

 low as the plantar, and alternate with them. 



Each dorsal interosseous has two heads and a central tendon, 

 which is inserted partly into the base of the proximal phalanx 

 and into the aponeurosis of the corresponding slip of the 

 common extensor tendon. The first two are inserted, one on 

 either side of the second toe, the third and fourth into the 

 outer sides of the third and fourth. Inner head of the first is 

 small, and rises from the first metatarsal and internal cunei- 

 form; the third and fourth receive fibers from the sheath of 

 the peroneus longus. 



Plantar interossei, rise from the inner and under surface 

 of the third, fourth, and fifth metatarsals, one-headed, and 

 from the sheath of the peroneus longus. Inserted into the 

 inner side of the proximal phalanges of the third, fourth, and 

 fifth toes, and into the aponeurosis of the corresponding slip of 

 the common extensor tendon. 



