276 A MANUAL OF ANATOMY 



7. The peroneal ridge on the outer surface of the os calcis, above 

 which is the groove for the peroneus brevis, whilst that for the 

 peroneus longus is below it. 



8. The peroneal notch and groove on the outer border and plantar 

 surface of the cuboid bone for the tendon of the peroneus longus. 

 The ridge behind the groove gives attachment to the long plantar 

 ligament. 



9. The tuberosity on the plantar aspect of the proximal end or 

 base of the first metatarsal bone, which gives insertion internally to 

 a sUp of the tendon of the tibialis anticus, and externally to the 

 main part of the tendon of the peroneus longus. (A slip of the 

 latter tendon is inserted into the lower and anterior part of the 

 external surface of the internal cuneiform bone.) 



The inner or tibial border of the foot is in line with the great toe, 

 or hallux. It is constructed by the os calcis, astragalus, navicular, 

 internal cuneiform, the first metatarsal, and the phalanges of the 

 great toe. 



The sustentaculum tali of the os calcis, the tuberosity of the 

 navicular bone, and the eminence on the plantar surface of the 

 internal cuneiform bone, pertain to this border. 



The internal surface of the internal cuneiform bone presents an 

 oblique groove, directed downwards and forwards, for the tendon of 

 the tibiahs anticus, the principal part of which is inserted into an 

 impression at the lower and posterior part of the groove. 



The outer or fibular border of the foot is in hne with the Httle toe. 

 It is constructed by the os calcis, cuboid, fifth metatarsal, and the 

 phalanges of the little toe. Its markings, enumerated from behind 

 forwards, are as follows: 



1. The tubercle for the middle fasciculus of the external lateral 

 ligament of the ankle-joint, situated about the centre of the outer 

 surface of the os calcis. 



2. The peroneal ridge, situated a little below and anterior to the 

 preceding tubercle, and lying between two grooves. The upper 

 groove transmits the tendon of the peroaeus brevis, and the lower 

 groove transmits the tendon of the peroneus longus, whilst the 

 ridge gives attachment to the fibrous septum, which separates the 

 two peroneal sheaths. 



3. The peroneal notch, situated on the outer border of the cuboid 

 bone, and leading to the peroneal groove, on the plantar surface of 

 the bone, for the tendon of the peroneus longus. 



4. The tuberosity on the outer side of the proximal end or base 

 of the fifth metatarsal bone, which gives insertion to the tendon of 

 the peroneus brevis. (The peroneus tertius is usually inserted into 

 the dorsal surface of the base of this metatarsal bone.) 



The anterior extremity of the foot is formed by the third or 

 ungual phalanges. 



It is to be noted that the great toe or hallux is almost as long as, 

 and parallel to, the second toe, in which respects it presents a 

 striking contrast to the thumb or pollex. 



