Page 264 - Adams and Stashak's Lameness in Horses, 7th Edition

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Figure 3.50. (Continued) Dorsolateral to palmaromedial oblique 9. Lateral bony ridge for attachment of the middle (oblique) distal
(D45L‐PaMO) projection of the metacarpophalangeal joint. (a) Third sesamoidean ligament.
metacarpal bone, (b) medial proximal sesamoid bone, (c) lateral 10. Sagittal groove on the proximal articular surface of the proximal
proximal sesamoid bone, and (d) proximal phalanx. phalanx.
1. Articular surface of the lateral proximal sesamoid bone. 11. Medial articular fovea of the proximal extremity of the proximal
2. The difference in radiographic opacity is caused by a difference phalanx.
in bone thickness on the lateral proximal sesamoid bone. The 12. Basilar margin of the medial proximal sesamoid bone.
base and body are more opaque than the apex and peripheral 13. Medial dorsal margin of the articular fovea on the proximal
border. The convex shape on the abaxial surface produces the phalanx.
distinct line between the two opacities. 14. Lateral dorsal margin of the articular fovea on the proximal
3. Palmar surface of the lateral condyle distal aspect of the third phalanx. Both margins (13, 14) are visible on correctly exposed and
metacarpal bone. positioned oblique projections of the metacarpophalangeal joint.
4. Palmar and dorsal aspects of the sagittal ridge on the distal third 15. Depression (concave surface) for attachment of the medial
metacarpal bone. collateral ligament on the distal third metacarpal bone. The
5. Junction of the peripheral and basilar margins of the medial visibility and distinctness of the concave line change on
proximal sesamoid bone. different projections. It may be more prominent on some
6. Lateral articular fovea of the proximal extremity of the proximal examinations and not visible on others.
phalanx. 16. Abaxial articular margin of the medial proximal sesamoid bone.
7. Lateral tuberosity on the proximal palmar aspect of the proximal 17. Dorsal aspect of the medial condyle on the third metacarpal bone.
phalanx. 18. Eminence on the third metacarpal bone for attachment of the
8. Medial tuberosity on the proximal palmar aspect of the proximal medial collateral ligament.
phalanx.

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