![]() ![]() The four metacarpals other than the thumb metacarpal also articulate proximally with each other 2.ĭistally, each metacarpal head articulates with the base of its corresponding proximal phalanx 2. fifth (little) metacarpal: articulates with the hamate. ![]() fourth (ring) metacarpal: articulates with the hamate as well as a small part of the capitate.third (middle) metacarpal: articulates with the capitate.second (index) metacarpal: articulates with the trapezoid as well as the trapezium via a small tubercle.first (thumb) metacarpal: articulates with the trapezium via a saddle-shaped synovial joint.Proximally, the metacarpals articulate with the distal row of carpal bones 2: the four heads form a convexity distally and dorsally make the knuckles of the fist.behind these fossae lie tubercles for the attachment of the collateral ligaments for the metacarpophalangeal joint.adjacent surfaces of the heads are pitted by deep smooth fossae.extends further on the flexor than extensor surfaces.round articular surface to the proximal phalanges.nutrient foramina of the metacarpal is often located around the neck region 4.it is the region between the shaft and the head.the sub-capital region inferior to the head.the four metacarpals form a gentle concavity for the palm.long flat triangle on the extensor surface with its base against the head and its apex prolonged proximally as a ridge along the shaft.the middle metacarpal has a styloid process that projects dorsally into an angle between the capitate and trapezoid.proximal expansion that serves the articular surface to the distal row of carpal bones.The shaft is also set at a right angle to the plane of the other four metacarpals such that the axis of thumb flexion and extension is across the palm 1.įor the remaining four metacarpals, each has the following features 2: ![]() Its base has a saddle-shaped facet for the trapezium. The thumb metacarpal is shorter and thicker. The metacarpal bones run from the carpus, forming the carpometacarpal joints, to the base of proximal phalanges, forming the metacarpophalangeal joints. ![]()
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