Hand Flashcards
(27 cards)
Scaphoid
Shaped like a boat, with a major concave surface for the head of the capitate and major convex surface ta articulates with the distal radius
Scaphoid Tubercle
a blunt, nonarticular projection adjacent to the hollowed capitate facet
Siding: positional scaphoid
hold the concave facet toward you and the tubercle up
the tubercle leans toward the side from which the bone comes
Lunate
shaped in the form of a crescent moon
deeply concave surface articulates with the capitate
large broad articulation opposite articulates with the radius
Siding: positional lunate
place the flat side on the table and the most concave facet toward you
the remaining facet rises up and toward the side from which the bone comes
Triquetral
third bone from the thumb side in the proximal carpal row
has three main articular surfaces
its pisiform articulation is a single circular isolated and elevated facet
Siding: positional triquetral
hold the common edge between the two largest facets toward you and vertically
when the third facet (for the pisiform) is up this facet points toward the side from which the bone comes
Pisiform
pea-shaped with one side flattened by the triquetral articular facet
smallest of the carpals
Siding: positional pisiform
hold the facet toward you and turn the bone until the bulk of the non-articular surface that is visible in this view is up
the groove and the bulk of this is visible surface is displaced from the side from which the bone comes
Trapezium
irregularly sided bone of medium size
distinguished by its largest facet, a saddle shaped articular surface for the base of MC 1 (thumb)
long, narrow raised tubercle (crest)
Siding: positional trapezium
place the bone on a flat surface with the tubercle on top and away from you and the concave facets on either side
the groove adjacent to the tubercle is on the side from which the bone comes
Trapezoid
boot-shaped
smallest carpal bone in the distal row
Siding: positional trapezoid
place the “sole” of the boot on the table with the narrow v-shaped space between the articular facets toward you
the toe of the boot then points towards the side from which the bone comes
Capitate
large carpal bone
distal end squared-off while the proximal end is rounded
the head is the rounded part of the bone
the base is the squared-off end.
Siding: positional capitate
when the head is up and the base rests on the table, place the long narrow articulation that runs up one side of the bone (from base to head) toward you
this articulation is on the side form which the bone comes
Hamate
has a hook-shaped, nonarticular projection (hamulus)
Siding: positional hamate
place the flat nonarticular surface down the hook and the two adjacent metacarpal facets away from you
the hook leans toward the side from which the bone comes
MC 1 (thumb)
shortest metacarpal, broader and more robust in its shaft
its articular surface is proximal and saddle-shaped
MC1 siding
the maximum palmar projection of the bone at the base is always toward the medial side
MC2
normally the longest metacarpal
the base presents a long curved blade-like wedge articulating surface
MC2 siding
the most proximal part of the base is a broad, blade-like medially positioned wedge
MC3
only MC with a sharp projection at its base (styloid process)
MC3 siding
the styloid process is on the lateral side
MC 4
shorter and more gracile than MC 2 and 3
fairly square base