274 MUSCLES OF THE SOLE OF THE FOOT. 



the external plantar artery and veins, the interossei muscles, tendon of 

 the peroneus longus, and metatarsal bone of the great toe. By its 

 inner border with the flexor brevis pollicis ; with which its fibres are 

 blended. 



The FLEXOR BREVIS MINIMI DIGITI arises from the base of the 

 metatarsal bone of the little toe, and from the sheath of the tendon of 

 the peroneus longus. It is inserted into the base of the first phalanx 

 of the little toe. 



Relations. By its superficial surface with the tendons of the flexor 

 longus and flexor brevis digitorunu the fourth lumbricalis, abductor 

 minimi digiti, and plantar fascia. By its deep surface with the plan- 

 tar interosseous muscle of the fourth metatarsal space, and the meta- 

 tarsal bone. 



The TRANSVERSUS PEDIS arises by fleshy slips, from the heads of 

 the metatarsal bones of the four lesser toes. Its tendon is inserted 

 into the base of the first phalanx of the great toe, being blended with 

 that of the adductor pollicis. 



Relations. By its superficial surface with the tendons of the flexor 

 longus and flexor brevis digitorum, and the lumbricales. By its deep 

 surface with the interossei, and heads of the metatarsal bones. 



Fourth Layer. 

 Interossei Plantares. 



The PLANTAR INTEROSSEI muscles are three in number, and are 

 placed upon rather than between the metatarsal bones. They arise 

 from the base of the metatarsal bones of the three outer toes, and are 

 inserted into the inner side of the extensor tendon and base of the first 

 phalanx of the same toes. In their action they are all adductors. 



Relations. By their superficial surface with the dorsal interossei 

 and the metatarsal bones. By their deep surface with the external 

 plantar artery and veins, the adductor pollicis, transversus pedis, and 

 flexor minimi digiti. 



Actions. All the preceding muscles act upon the toes ; and the 

 movements which they are capable of executing may be referred to 

 four heads, viz. flexion, extension, adduction, and abduction. In these 

 actions they are grouped in the following manner: 



Flexion. Extension. 



Flexor longus digitorum, Extensor longus digitorum, 



Flexor brevis digitorum, Extensor brevis digitorum. 



Flexor accessorius, 

 Flexor minimi digiti. 



Adduction. Abduction. 



Interossei * one dorsa1 ' Interossei, three dorsal, 



' three plantar. Abductor minimi digiti. 



