262 MUSCLES OF THE SOLE OF THE FOOT. 



fourtti metatarsal bones. It is inserted into the base of the first phalanx 

 of the great toe. 



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

 longus and flexor brevis digitorum, the musculus accessorius, and lumbri- 

 cales. By its deep surface, with the tarsal bones and ligaments, the exter- 

 nal 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 metatar- 

 sal bone of the little toe, and from the sheath of the tendon of the peroneus 

 longus. It is inserted into th^4>ase of the first phalanx of the little toe.- 



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

 longus and flexor brevis digitorum, the fourth lumbricalis, abductor 

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

 interosseous muscle of the fourth metatarsal space, and the metatarsal 

 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. 



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 mi- 

 nimi digiti. 



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

 ments 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. 



I . ( one dorsal, Interossei, three dorsal, 



ie1 ' I three plantar. Abductor minimi digiti. 



