the of the dinmetacarpal bones are located in ha ,trael through the palm of the
ID: 3511350 • Letter: T
Question
the of the dinmetacarpal bones are located in ha ,trael through the palm of the with the carpal bones. Distally, the the palm; the phalanges (singular phalanx) are the bones metacarpal bones hand. The proximal ends (bases) of hee miniature loeg bones articulate Proximal Distal Carpal Bones articulate with the proximal phalanges of the digits to form the Trapezold Lunate Triquetum (MP) joints (the knuckles). The metacarpals are numbered by Roman numerals 1-V from lateral to medial Capitate 2 Notice that, similar to the metacarpal bones, the phalanges are Pisiform Hamate long bones with a proximal base and tacarpophaliangesl a distal head. The thumb contains -Proximal phalanx only two phalanges, all the other digits contain three. The articulations between phalanges are called interphalangeal (IP) joints. of thumb (pollex) Metacarpal Distal phalanx of MP) joints Proximal phalanx thumb (pollex) Middle phala Right wrist and hand posterior (dorsal) view Distal phalank P) joints MAKING CONNECTIONS The carpal bones are held together by ligaments that restrict their mobility to gliding movements. From a functional standpoint, why do you think this arrangement is necessary? IN THE C Carpal Bone Fractures The scaphold is the most common carpal bone to be fractured accounting for 70 percent of all cases. Fractures of the capitate are rare because it fits snugly between other bones and is in a protected position. Fractures are usualy caused by a hard blow to the dorsum of the hand or the hand is used for protection from a fall causing excessive extension of the wrist. Carpal fractures are not always clearly demonstrated on x-ray images; bone and CT scans may fractures can be treated by placing the wrist in a cast for about stx weeks followed by physical therapy. More severe fractures be required to confirm a diagnosis. Most carpal bone lld which the bwoken bone is heild together require surgery with pins or plates prior to immobilding in a cast.Explanation / Answer
Carpal bones are held together by ligaments..the articulations between carpal bones and metacarpal bones are PISOMETACARPAL LIGAMENT, AND PALMAR AND DORSAL CARPOMETACARPAL LIGAMENTS.
Inorder to maintain mobility without sacrificing stability, wrist joint has a complex configuration of ligaments.
carpal bones are organized into proximal distal rows. the bones are given in the image given in the question.
The proximal row bone represent an intercalated segment, as no tendons insert upon them.for this reason their movement is dependent entirely on mechanical forces from surrounding articulations.
the bones of distal row are closely adherent to each other via intercarpal ligaments.these bones are also tightly bound to the metacarpal bones, representing carpometacarpal joint. The ligamentous connection between the trapezoid and capitate to the index and middle finger metacarpals are so rigid that the distal carpal row has been considered a component of a fixed hand unit that moves in response to MUSCULOTENDINOUS FORCES generated from the forearm.
Ligaments of intercarpal articulations which unite carpal bones with one another
radiate carpal ligament, dorsal, palmar and interosseus intercarpal ligament and pisohamate ligament.
For each finger there is also a longitudinal arch. together, these arches allow the palm and the digits to CONFORM OPTIMALLY TO OBJECTS as we grasp them. furthermore, as the amount of surface contact is maximized STABILITY is enhanced and sensory feedback increases. without ligaments there occurs instability in the wrist joint and movements are not smooth thus these arrangements of carpal bones and ligaments are necessary.
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