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The hand contains 27 bones. Each one belongs to one of three regions: the carpals, wrist, or the metacarpals, which forming the
palm and the phalanges, which form the digits.
The eight irregularly shaped carpals are
the most proximal bones of the hand. The carpals are often split into two rows,
the proximal row containing the scaphoid, lunate, triquetrum and pisiform
moving lateral to medial. The scaphoid and lunate articulate with the radius,
and the lunate and triquetrum articulate with the articular disk of the wrist.
The pisiform carpal is a sesamoid bone, located within a tendon and is not
involved in movement at the wrist.
In the distal row contains the trapezium,
trapezoid, capitate and hamate moving lateral to medial. The trapezium
articulates with the scaphoid proximally and the first, thumb, and second
metacarpal distally. The trapezoid articulates with the scaphoid proximally and
the second metacarpal distally. The capitate articulates with the scaphoid and
lunate proximally and the third and fourth metacarpal. Finally the hamate articulates
with the lunate and triquetral proximally and the fourth and fifth, little
finger, metacarpals distally.
The hand contains five metacarpal bones
which articulate proximally with the carpals and distally with the proximal
phalanges. They are numbered moving lateral to medial starting with the thumb
which is metacarpal I, and ending with metacarpal V, the little finger. Each
metacarpal consists of a base, shaft and head, with the concave lateral and
medial borders of the shaft allowing attachment of the interossei muscles.
The digits are named in a
similar fashion to the metacarpals moving lateral to medial starting at the
thumb. With the exception of the thumb each digit contains a proximal,
intermediate and distal phalange; the thumb lacks an intermediate phalange. The
length of the phalanges decreases distally.
Source: Boundless. “Carpals, Metacarpals, and Phalanges (The Hand).” Boundless Anatomy and Physiology. Boundless, 17 Aug. 2016. Retrieved 27 Aug. 2016 from https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/skeletal-system-parts-of-the-skeleton-7/the-upper-limb-86/carpals-metacarpals-and-phalanges-the-hand-488-3143/