OSTEOLOGY. 
234 
and is occasionally a separate ossicle (os trigonum). 
To 
posterior fasciculus of the external lateral ligament of the ankle-joint. 
it is attached the 
The 
vroove, which winds obliquely from above downwards and inwards over the pos- 
terior surface of the bone, lodges the tendon of the flexor lon 
Tendo Achillis 
—Os CALCIS 
Abduetor hallucis 
;——Abductor minimi digiti 
Flexor brevis digitorum ——— 
—Accessorius 
_» Flexor brevis hallucis 
SéxenorE (i CuBOID 
fol Be "HO 
OY NAVICULAR i _-MIDDLE CUNEIFORM 
EXTERNAL 
Wahi CUNEIFORM 
Tibialis posticus€ 
Peroneus brevis 
INTERNAL 
CUNEIFORM digit 
Tibialis antieus halluci 
iallucis 
= Palmar interossei 
Peroneus longus 
V. METATARSAL 
I. METATARSAL De 
SESAMOID BONES Flexor brevis 
and abductor 
minimi digiti 
Plantar inter- 
Flexor brevis ossei 
and abductor_[_ 
hallucis 
A) 
Flexor brevis 
and adductores-— 
hallucis 
FIRST PHALANX—— 
Flexor brevis 
digitorum 
Flexor longus 
digitorum 
Flexor longus/ 
hallueis 
SECOND 
PHALANX 
THIRD OR TERMINAL PHALANX 
Fic. 174. —BonkEs OF THE RIGHT FOOT AS SEEN FROM BELOW. 
Flexor brevis min. 
Adductor obliquus 
cus hallucis muscle. 
The head (caput 
tali), of oval form, 
is directed forwards 
and inwards. Its 
anterior surface is 
convex from side to 
side and from above 
downwards, and 
articulates with the 
navicular bone 
(facies articularis 
navicularis). — _In- 
feriorly this surface 
is confluent with 
the middle calean- 
ean facet, but in 
well-marked speci- 
mens, or when the 
bones are articu- 
lated, it will be seen 
that a small area 
in front of, and ex- 
ternal “to, time 
middle  calecanean 
facet, rests upon an 
articular surface on 
the upper part of 
the fore portion of 
the os ealeis, and is 
called the anterior 
calcanean ~+facet 
(facies articularis 
caleanea anterior). 
To the inner and 
under surface of the 
head there is a 
cartilage - covered 
surface which does 
not articulate with 
any bone, but rests 
on the upper surface 
of the inferior ecal- 
caneo - navicular 
ligament, and is 
supported on the | 
inner side by the 
tendon of the tibi- 
alis posticus muscle 
(Fawcett, Hd. Med. 
Journ. 1895, p.987). 
The neck (collum tali), best seen above, passes from the front of the body and 
inclines towards the inner side. 
It is confluent with the inner surface in front of 
the internal malleolar facet, and externally forms a wide groove, which becomes con- 
tinuous inferiorly with the outer end of the interosseous groove. 
