. Cunningham's Text-book of anatomy. Anatomy. THE CUNEIFOEM BONES. 261 the edges of which are striated. Into this surface the tendo calcaneus is inserted. The lowest surface is rough and striated, and is confluent below with the medial and lateral processes; this is overlain by the dense layer of tissue which forms the pad of the heel. Os Naviculare Pedis. The navicular bone ( scaphoid), of compressed piriform shape, is placed on the medial side of the foot, between the head of the talus posteriorly and the three cuneiform bones anteriorly. The bone derives its name from the oval or boat-s
. Cunningham's Text-book of anatomy. Anatomy. THE CUNEIFOEM BONES. 261 the edges of which are striated. Into this surface the tendo calcaneus is inserted. The lowest surface is rough and striated, and is confluent below with the medial and lateral processes; this is overlain by the dense layer of tissue which forms the pad of the heel. Os Naviculare Pedis. The navicular bone ( scaphoid), of compressed piriform shape, is placed on the medial side of the foot, between the head of the talus posteriorly and the three cuneiform bones anteriorly. The bone derives its name from the oval or boat-shaped hollow on its proximal surface, which rests upon the head of the talus. Its distal aspect is furnished with a semilunar articular area, which is sub- divided by two faint ridges into three wedge-shaped facets for articulation, medio-laterally, with the first, second, and third cuneiform bones. The dorsal surface of the bone, o • j i ^___ Second cuneiform convex irom side to ^^^^^^^^ Third side, is rough for the attachment of the liga- ments on the dorsal aspect of the foot. On its plantar aspect the bone is irregularly con- cave ; projecting down- wards and backwards from its lateral side TuBER0S£LTAR Pr0CJs ***££ w 1 *™- **»- ,!•/>, O Tuberosity there is often a pro- A B minent spur of bone, PlG_ 261<_Thb Right Navicular Bone. . , . , , ' A. Seen from behind. B. Seen from the front. which is attached the plantar calcaneonavicular ligament. The lateral surface is narrow from before backwards, and rounded from above downwards. In 70 per cent of cases (Manners Smith) it is provided with a facet which rests upon a corresponding area on the cuboid. Behind this in rare instances there is a facet for the calcaneus. The medial surface of the bone projects beyond the general line of the medial border of the foot, so as to form a thick rounded tuberosity (tuberositas oss. navicularis), the position of which can be easily determined in the living. To the medial and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
