Copyright © The dorsal digital nerves and the deep branch of the ulnar nerves also innervate these joints. The part of the scaphoid without cartilage is attached to ligaments and has blood vessels that come from the radial artery. They also supply neural messages to the inter-carpal joints. The shaft provides the insertion point for the third palmar interosseous and the ulnar head of third dorsal interosseous on its lateral side, while the medial side is where the fourth dorsal interosseous attaches. Severe cases may even need surgical intervention [15]. The bones of the hand provide support and flexibility to the soft tissues. the one attached to the thumb and the little finger, are brought close to each other, the concavity of the palm becomes prominent. 21-6, B). The head of each metacarpal has a convex articular surface that faces distally and articulates with the base of the corresponding proximal phalanx at the metacarpophalangeal joint. Similar modelling has been seen on the proximal aspect of the fourth metatarsal bone (Fig. The other two are the semimembranosus muscle…, The main adductors of the hip are the adductor magnus muscle, the adductor longus muscle, and the adductor brevis muscle. The basic function of the metacarpals is to act as the bridge between the wrist and fingers, forming the framework of the hand. The human bone manual by Tim D. White and Pieter A. Folkens. Metacarpal IV articulates with capitate, hamate, metacarpal III and metacarpal V. Metacarpal V articulates with the hamate and the fourth metacarpal. The joints between the metacarpal and carpal bones, these are all plane synovial joints, except the thumb as it is a saddle joint (another form of synovial joint) [8]. The degree of fixation of the bones depends on the metacarpal concerned and can be described as: Each metacarpal bone has a common structure: The articulations of the metacarpals bones can be described as: The metacarpal bones act as the anchor for the phalanges and the carpal bones. the fifth one is partially independent. These bones are classified as long bones, and together, they are called the metacarpus, forming the palm of the hand [2]. Reproduction in whole or in part without permission is prohibited. Metacarpal Bones. Aside from the common features that it shares with other metacarpals, the first metacarpal is recognizable by a longitudinal ridge on its medial (palmar) surface, which divides this surface into a large lateral and a small medial part. Nutrient vessels in the second and fourth metacarpal bones are seen with variable clarity. By visiting this site you agree to the foregoing terms and conditions. The metacarpal bones articulate proximally with the carpals, and distally with the proximal phalanges. Is our article missing some key information? The metacarpal bones have all the same segments: A proximal extremity (base) bearing an articular surface for the distal row of the carpal bones and additional facets towards its neighbours. There are three phalanges in four of the fingers while the thumb has a proximal and distal phalanx. the one attached to the thumb and the little finger, are brought close to each other, the concavity of the palm becomes prominent. Fig 2 – Palmar view of the carpal bones of the left hand. Dislocations of the carpometacarpal joints are quite rare, with few medical cases reported. A shaft (body) with a palmar and a dorsal surface, and medial and lateral borders. The capitate is a large bone in the second row of the wrist bones. Ventricles, meninges and blood vessels of the brain, The first metacarpal articulates with the trapezium, The second metacarpal articulates with the trapezium, trapezoid and capitate, The fourth and fifth articulate with the hamate. Fractured metacarpal symptoms can depend on a number of factors, including the cause of the fracture and what metacarpal bone is broken. All Rights Reserved. The interossei muscles attach to the proximal part of the shaft; the ulnar head of the first dorsal interosseous attaches from the lateral side, while the second palmar and second dorsal interossei attach from the medial side. Fig 3 – Transverse section of the carpal tunnel. They are labeled with numbers 1-5 going in the radio-ulnar direction. The metacarpus is a group of five bones of the hand between the phalanges and the carpus. Metacarpal bones: want to learn more about it? The fourteen phalanges of hand bones make up the fingers and thumb and are numbered I-V (thumb to little finger) while the hand is observed from an anatomical position (palm up).

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