SGU yaad i oy Oe 225 
Between the two condylic surfaces the bone is raised in the centre to form the 
spine (eminentia intercondyloidea), the summit of which is grooved and capped on 
either side by tubercles which spring TRIES Sea 
from and are formed by the upward 
extension of the neighbouring con- 
dylic areas. Of these tubercles the ,¢3enosry——y, 
inner (tuberculum intercondyloid- aS : 
- eum mediale) is the higher, and ee ‘ 
_ longer in an antero-posterior direc- | 
tion, the outer (tuberculum inter- 
- condyloideum laterale) being more 
pointed and not so elevated. In 
_ front and behind the spine the 
articular areas are separated by two 
irregular V-shaped surfaces, the 
intercondylic fosse. The anterior 
NTERNAL 
UBEROSITY 
Ligamentum 
patella 
Gracilis 
Sartorius 
Semitendinosus 
Extensor longus 
; 
; 
_ fossa (fossa intercondyloidea an- digitorum 
' terior), the larger and wider, fur- 
: 
: 
EXTERNAL 
SURFACE 
nishes areas for the attachment of 
_ the semilunar cartilages on either 
side, and for the anterior crucial | | 
- hgament immediately in front of | } Oresr 
the spine. The floor of this space : 
is pierced by many nutrient fora- senna 
mina. ‘The posterior intercondylic 
_ fossa (fossa intercondyloidea pos- 
terior) is concave from side to side, 
and slopes downwards and_ back- 
Peroneus longus 
Tibialis 
anticus 
SUBCUTANEOUS 
INTERNAL 
SURFACE 
Peroneus brevis 
~——~ Tibialis posticus 
INTEROSSEOUS 
' wards. The external semilunar RIDGE 
cartilage is attached near its apex sh eran 
0a surface which rises on to the =*te2ser proprius— 
hallucis 
back of the spine; the internal Surrace ror rx- 
. 5 . a TENSORS OF ANKLE 
semilunar cartilage is fixed to a 
groove which runs along its inner 
edge, and the posterior crucial liga- hte 
ment derives an attachment from sroxonsor avKet 
the smooth posterior rounded surface. 
The external tuberosity (condylus 
lateralis) is the smaller of the two. 
It overhangs the shaft to a greater 
extent than the external, though 
_ this is obscured in the living by its 
articulation with the fibula. The 
facet for the fibula, often small and 
indistinct, is placed postero-exter- 
nally on the under surface of its 
most projecting part. Antero-exter- 
Peroneus tertius~ 
gee . 
: : SuBCUTANEOUS asieg 
nally the imprint caused by the SURFACE 885% 
“1: ore c . HOES 
attachment of the ilio-tibial band is gag" 
often quite distinct. The circum- Bs 
a a “ é Qs 
ference of the internal tuberosity INTERNAL 
(condylus medialis) is grooved pos- oiineges: 
tero-internally for the insertion of 
the tendon of the semimem- 
branosus. iy te : f Baa 
In front of the tuberosities, and SHES a Ven et ine Pitas gales 
about an inch below the level of 
the condylic surfaces, there is an oval elevation called the tubercle of the tibia, 
or the anterior tuberosity (tuberositas tibie). The upper half of this is smooth 
1s) 
EXTERNAL 
MALLEOLUS | 
