362 THE MUSCULAR SYSTEM. 
the thick central part of the plantar fascia which covers it and the intermuscular 
septa on either side. Passing forwards, it gives rise to four slender tendons, which 
are inserted into the second phalanges of the four outer toes, after having been 
perforated, just as in the case of the tendons of the flexor sublimis digitorum of 
the hand, by the long flexor tendons. Placed in the centre of the sole beneath 
the plantar fascia, and between the abductor hallucis and abductor minimi digiti 
muscles, it conceals the second layer of muscles and the external plantar vessels 
and nerve. 
The abductor minimi digiti (m. abductor digiti quinti) has also a double 
origin: (1) from both tubercles on the tuberosity of the os caleis, and (2) from 
the plantar fascia and calcaneo-metatarsal hgament. It lies along the fifth meta- 
tarsal bone, and is inserted 
into the outer side of the 
first phalanx of the little toe. 
It partially conceals the flexor 
brevis minimi digiti, and lies 
on the outer side of the 
flexor brevis digitorum. 
The tendons of the long 
flexors of the toes, the 
lumbricales and accessorius 
muscles, constituting the 
second layer of muscles, have 
already been described. 
ADDUCTOR | 
TRANSVERSUS ! 
HALLUCIS 
INTEROSSEI — 
Lying beneath the abductor 
* LEXOR . . 
BREVIS MINIMI ADPUCTOR OBLIQUUS hallucis and the flexor brevis 
DIGITI HALLUCIS Sus 
digitorum, and separated 
FLEXOR BREVIS HALLUCIS from them by the plantar 
vessels and nerves, they 
PERonwvs occupy the hollow of the 
LONGUS 
tarsus and the space between 
TIBIALIS POSTICUS the first and fifth metatarsal 
FLEXOR LONGUS HALLUCIS bones ; their deep surfaces 
FLEXOR Loncus picirorum are 1n contact with the ad- 
ductors of the great toe and 
the interossei muscles. 
The flexor brevis hallucis 
arises (1) from the inner sur- 
face of the cuboid bone, and 
(2) from the tendon of the 
tibialis posticus. Directed 
forwards over the first meta- 
tarsal bone, the muscle separ- 
Fic. 267.—THE MUSCLES OF THE RicHt Foor (after removal of the ates into two parts, between 
See te which is the tendon of the 
flexor longus hallucis. Each portion gives rise to a tendon which is inserted into 
the corresponding side of the base of the first phalanx of the great toe; in each 
tendon, under the metatarso-phalangeal articulation, a sesamoid bone is developed. 
The inner tendon is united with the insertion of the abductor, the outer tendon 
with the insertions of the adductor muscles of the great toe. 
The adductor obliquus hallucis arises (1) from the sheath of the peroneus 
longus, and (2) from the heads of the third and fourth metatarsal bones. Occupy- 
ing the hollow of the foot, deeper than the long flexor tendons and lumbricales, and 
separated from the interossei by the plantar arch, it is placed on the outer side of 
the flexor brevis hallucis, and is directed obliquely inwards and forwards, to be 
inserted on the outer side of the base of the first phalanx of the great toe between 
and along with the flexor brevis and adductor transversus hallucis. The muscle 
forms one side of a triangular space in the sole through which the external 
plantar vessels and nerve pass. 
+4 
a 
