Page 261 - Adams and Stashak's Lameness in Horses, 7th Edition

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Figure 3.48. (Continued) Flexed lateromedial (flexed LM) 6. Midpalmar surface of the proximal phalanx, located between
projection of the metacarpophalangeal joint. This projection allows the medial and lateral tuberosities.
the most effective evaluation of the articular surface of the sesa­ 7. Palmar and dorsal aspects of the superimposed medial and
moid bones, offers good visualization of small articular basilar lateral condyles of the third metacarpal bone.
sesamoid fractures and changes, and provides a distinct projection 8. Sagittal groove on the proximal articular surface of the proximal
of the proximal tuberosities. Furthermore, the dorsal articular phalanx, which articulates with the sagittal ridge on the distal
surface of the third metacarpal bone can be evaluated without third metacarpal bone.
superimposition of the proximal phalanx. (a) Third metacarpal bone, 9. Superimposed fovea (articular surface) of the proximal
(b) proximal sesamoid bones, and (c) proximal phalanx. extremity of the proximal phalanx.
1. Apex of the superimposed proximal sesamoid bones. 10. Superimposed medial and lateral parts of the extensor
2. Superimposed articular surfaces of the proximal sesamoid eminence of the proximal phalanx.
bones. 11. Transverse ridge on the distal articular surface of the third
3. Bases of the superimposed proximal sesamoid bones. metacarpal bone, which separates the distal articular surface of
4. Superimposed medial and lateral tuberosities on the proximal the third metacarpal bone into dorsal and palmar parts.
caudal aspect of the proximal phalanx, where ligamentous 12. Bony depression where the proximal dorsal recess from the
attachments occur. metacarpophalangeal joint is located.
5. Sagittal ridge on the distal articular surface of the third metacar­ 13. Bony depression where the proximal palmar recess from the
pal bone; the dorsal and palmar aspects are labeled. metacarpophalangeal joint is located.

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