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The ring metacarpal is somewhat more mobile while the fifth metacarpal is semi-independent. [1] Each metacarpal bone consists of a body or shaft, and two extremities; the head at the distal or digital end (near the fingers), and the base at the proximal or carpal end (close to the wrist).
[3] [5] The third (middle finger) metacarpal head has been reported to be the most common site of necrosis. [6] Though osteonecrosis is a fairly common condition, many cases of avascular necrosis of the metacarpal head go without being diagnosed. This is because presentation of symptoms is variable depending on the patient.
The first metacarpal bone is short and thick with a shaft thicker and broader than those of the other metacarpal bones. Its narrow shaft connects its widened base and rounded head; the former consisting of a thick cortical bone surrounding the open medullary canal; the latter two consisting of cancellous bone surrounded by a thin cortical shell.
Metacarpal neck fracture of the little finger, scrapper's fracture, [1] bar room fracture, street fighter's fracture [1] Boxer's fracture of the 5th metacarpal head from punching a wall: Specialty: Emergency medicine, orthopedics: Symptoms: Pain, depressed knuckle [2] Causes: Hitting an object with a closed fist [3] Diagnostic method
The metacarpal bone of the index finger has two centres of ossification: a primary centre in the shaft and a secondary centre in the head. This contrasts to the first metacarpal bone where the secondary centre is found in the base. The ossification process begins in the shaft during prenatal life, and in the head between 11th and 22nd months. [4]
It articulates with the third metacarpal bone (the middle finger) and forms the third carpometacarpal joint. The capitate bone is the largest of the carpal bones in the human hand . It presents, above, a rounded portion or head, which is received into the concavity formed by the scaphoid and lunate bones ; a constricted portion or neck; and ...
The third metacarpal bone (metacarpal bone of the middle finger) is a little smaller than the second.. The dorsal aspect of its base presents on its radial side a pyramidal eminence, the styloid process, which extends upward behind the capitate; immediately distal to this is a rough surface for the attachment of the extensor carpi radialis brevis muscle.
A collateral ligament flanks each MCP joint - one on either side. Each attaches proximally at the head of the metacarpal bone, and distally at the base of the phalynx. Each extends obliquely in a palmar direction from its proximal attachment to its distal attachment. [2]