Hand Skeleton


I- Introduction :

The skeleton of the hand is formed of 3 parties :

  • the carp: responsive to the wrist
  • the pastern: which forms the palm of the hand
  • the phalanges: which constitute the skeleton of the fingers

II- descriptive anatomy :

1- the carp :

The carp forms a complex joint part interposed between the bones of the forearm and the metacarpus bottom, it is made up of 8 the provisions 2 rows

The top row : it comprises inward :

  • the scaphoïde
  • The lunate (lunatum)
  • the pyramidal (triquetrum)
  • the pisiform (accessory)

The bottom row :

  • the trapeze
  • the trapezoid
  • The large bone (capitatum)
  • The bone crochu (Hmtum)

In general, carpus bone forms a solid irregular transversely elongate and forms a concave forward wider than high gutter.
Anteriorly form the carpal groove
Posteriorly is convex
Its top form the condyle carpal
Its underside articulates with the base of 5 metacarpals

The spacing between the médiocarpien 2 rows :

  • Convex down in its outer third
  • Concave down in its 2 internal third

Each carpal bone has a cubic shape and present 6 faces, the anterior and posterior are occupied by muscle and ligament insertions, the other sides are joint except the peripheral faces of the external os.

  • the scaphoïde : the bone of the outermost 1in row, its front face is triangular in top vertex, extended downwards and outwards by the tubercle of the scaphoid
  • The lunate : Bone intermediary between the scaphoid and the pyramidal cap and the head of the large bone
  • the pyramidal : located within the lunate and is the innermost bone 1in row
  • the pisiform : ossicle rounded, placed in front of pyramidal

  • the trapeze : the bone of the outermost 2th row, it is situated between the scaphoid and 1is metacarpal
  • the trapezoid : located inside the trapezoid and outside the large bone and below the scaphoid
  • The large bone : it is the larger bones carp, he introduces 3 parties : the head, the neck and the body
  • The bone crochu : the bone of the innermost 2th carpal row, triangular prismatic shape

2- the pastern :

Constitutes the skeleton of the palm of the hand, compound 5 metacarpals are counted inwards :

These are the long bones, pairs, unsymmetrical, they have to describe :

  • A body : triangular prism
  • A base : upper end and voluminous cuboïque
  • A head : lower end
  • The 1is meta is short and bulky, its base is not joint with the 2nd metacarpal
  • The 2th meta is the longest of all, its base articulates with the trapezoid, trapezoid and large bone
  • The 3th meta is shorter but bigger than the 2nd, its base responds to os
  • The 4th meta is small (skinny), its base corresponds to the outer surface of the bone hook
  • The 5th meta is very short, its base corresponds to the internal surface of the bone hook

3- the phalanges :

Phalanges extend the metacarpals and form the skeleton of the fingers, each finger consists of 3 phalanges :

  • The 1in phalange (proximal)
  • The 2th phalange (phalangine)
  • The 3th phalange (phalangette)

NB : thumb is that 2 phalanges