| − | The proximal phalanx is shaped like an hourglass and is wider proximally than distally. Proximally, it has two shallow articular surfaces separated by a small '''sagittal groove'''; the medial cavity is larger than the lateral cavity. The saggital groove accepts the saggital ridge of the distal [[Bones and Cartilages - Horse Anatomy#Metacarpals and Metatarsals|third metacarpal ]](cannon) bone. Distally there are two convex areas separated by a sagittal groove to accept the proximal articulation of the middle phalanx. The proximal phalanx is approximately twice the length of the middle phalanx. | + | The proximal phalanx is shaped like an hourglass and is wider proximally than distally. Proximally, it has two shallow articular surfaces separated by a small '''sagittal groove'''; the medial cavity is larger than the lateral cavity. The saggital groove accepts the saggital ridge of the distal [[Limb Bones and Cartilages - Horse Anatomy#Metacarpals and Metatarsals|third metacarpal ]](cannon) bone. Distally there are two convex areas separated by a sagittal groove to accept the proximal articulation of the middle phalanx. The proximal phalanx is approximately twice the length of the middle phalanx. |