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*Paired '''collateral ligaments''' bridge the sides of the three main articulations.
 
*Paired '''collateral ligaments''' bridge the sides of the three main articulations.
 
*The  '''flexor retinaculum''' is the carpal fascia on the palmar aspect and lies between the accessory carpal bone and the medial aspect of the carpus. This with the joint capsule and medial surface of the accesory carpal bone makes up the '''carpal canal'''. It houses just the deep digital flexor tendon in the dog.
 
*The  '''flexor retinaculum''' is the carpal fascia on the palmar aspect and lies between the accessory carpal bone and the medial aspect of the carpus. This with the joint capsule and medial surface of the accesory carpal bone makes up the '''carpal canal'''. It houses just the deep digital flexor tendon in the dog.
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===Metacarpal Joint===
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The metacarpal joint is defined by the presence of palmar [[Bones and Cartilage - Anatomy & Physiology#Types of Bone|'''sesamoids''']], which allow the flexor tendons to pass over the sharp change in angle presented by the joint.  These are paired on each digit, with the exception of the first digit where it exists.
       
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