yee 
lower part, which passes across the dorsum of the foot, and joins the fascia of the 
sole at its inner border. Beneath this hgament are three special compartments 
with separate synovial sacs, one for the tibialis anticus tendon, a second for that 
of the extensor proprius hallucis, and a third for the extensor longus digitorum 
and peroneus tertius tendons. ‘There are occasionally other additional bands of the 
deep fascia passing like the straps of a sandal across the dorsum of the foot. 
The plantar fascia is of great importance. In the centre of the sole it forms 
a thick triangular band, attached posteriorly to the tuberosity of the os calcis. It 
spreads out anteriorly and separates into jive slips, which are directed forwards to 
the bases of the toes. These slips as they separate are joined together by ill-defined 
bands of transverse fibres, which constitute the superficial transverse metatarsal 
ligament. The slip for each toe joins the tissue of the web of the toe and is 
continuous with the digital 
sheath. On each side of the 
toe a band of fibres is directed 
forwards, to be attached to the 
sideof the metatarso-phalangeal 
articulation and the base of the 
first phalanx. 
This central portion of the 
plantar fascia assists In preserv- 
ing the arch of the foot, by 
drawing the toes and the os 
calcis together. 
On each side it is continuous 
with a much thinner layer 
which covers the lateral muscles nd patiew or | 
of the sole, and joins the fascia plantar fascia \& 
of the dorsum of the foot at Thick central Sate 
: Ro aed of plantar fascia 
each border. It also gives rise Tiss Dbebonvor 
to intermuscular septa, which plantar fascia 
pass upwards on each side of 
the flexor brevis digitorum, 
enclosing that muscle in a 
separate sheath, and giving 
investments on either side to 
the abductor muscles of the 
great and little toes. At the 
outer border of the foot the 
calcaneo-metatarsal ligament, a thickened band of the fascia, connects the 
tuberosity of the os calcis with the base of the fifth metatarsal bone. 
The digital sheaths, though smaller, are the same in arrangement as those of the 
fingers. Vaginal ligaments are present in relation to the first and second 
phalanges. 
THE MUSCLES OF THE LEG AND FOOT. 300 
Connective tissue and 
fat in the web of the 
toes 
Branches of internal 
plantar nerve | 
VEE \ Branches of external 
TAL | 
J plantar nerve 
Outer portion of 
plantar fascia 
Branches of external 
plantar nerve 
Outer portion of plantar 
fascia 
Caleaneo-metatarsal 
ligament 
Fic. 260.—THE PLANTAR FASCIA AND PLANTAR CUTANEOUS 
NERVES. 
THE MUSCLES OF THE LEG AND FOOT. 
The muscles of the lee and foot are divisible into three series: (1) the extensor 
muscles on the front of the leg and dorsum of the foot; (2) the peronei on the 
outer side of the lex; and (3) the flexor muscles on the back of the leg and in the 
sole of the foot. 
THE MUSCLES ON THE FRONT OF THE LEG AND DoORSUM OF THE FOOT. 
The muscles on the front of the leg and dorsum of the foot include two groups: 
(1) on the front of the leg, the tibialis anticus, long extensors of the toes and 
peroneus tertius; and (2) on the dorsum of the foot, the extensor brevis digitorum. 
The tibialis anticus (m. tibialis anterior) arises from the upper two-thirds 
of the outer surface of the tibia, from the interosseous membrane, from the 
_ fascia over it, and from an intermuscular septum externally. The muscle ends in 
23 & 
i. 
