Quiz 6: Wrist and Hand Flashcards
Short, thick metacarpal with single proximal articulation
MC1 (Thumb)
MC1 articulates with (1)
Trapezium
How to side MC1
- Crest = Lateral
- Shaft meets base, flared slightly lateral
- Lateral palmar surface = larger and more excavated
- Viewed dorsally w/ distal end up = Axis of max length skewed toward the side the bone is from
Longest metacarpal, blade-like wedge (butt)
MC2
MC2 Articulations (4)
Trapezium, trapezoid, capitate, MC3
How to side MC2
- Blade-like wedge = palmar, ulnar, and medial
- Double articular facet for MC3 is medial
- Single-side articular facet for trapezium is radial and lateral
Styloid process, second longest metacarpal, base has sharp projection
MC3
Articulations of MC3 (3)
Capitate, MC2, MC4
How to side MC3
- Styloid process is dorsal, radial, lateral
- Double articular facet for MC2 is lateral
- Articulation with MC4 (medial) is also a double facet but is separate circles
Slender and gracile metacarpal, two circle facets on one side and flat facet on the other
MC4
Articulations of MC4 (3)
Hamate, MC3, MC5
How to side MC4
- Two circles facet (art. for MC3) = Lateral
- Single, long facet (art. for MC5) = Medial
- Proximal and medial basal facets form a right angle
Shortest (besides MC1), slender metacarpal
MC5
Articulations of MC5 (2)
Hamate, MC4
How to side MC5
- Only one articular facet = MC 4 = Lateral
- Non-articular side = Medial, away from MC4
MC 2-5 proximal (basal) articulations go from _______ shape to ________ shape if you go medially (ulnar) and get smaller
Triangular to square
Which two metacarpals have a rounded, square base
MC1 and MC 5
Proximal row
Scaphoid, Lunate, Triquestral, Pisiform
Distal Row
Trapezium, Trapezoid, Capitate, Hamate
Which two carpals articulate with the radius
Scaphoid, Lunate
Trapezium articulates with which metacarpal(s)
MC 1 and 2
Trapezoid articulates with which metacarpal
MC 2
Capitate articulates with which metacarpal(s)
MC 2 and 3 (sometimes 4)
Hamate articulates with which metacarpal(s)
MC 4 and 5
Boat shaped carpal, articulates with radius (radial facet) and capitate
Scaphoid
Palmar and lateral attachment site for flexor retinaculum muscle on the scaphoid
Scaphoid tubercle
Moon shaped carpal, 5 art. facets, concave/distal side articulates with capitate, convex/proximal side art. with radius
Lunate
Triangular-shaped carpal, third from the thumb, 3 articular surfaces for the Hamate, Lunate, and pisiform
Triquetral
Pea-shaped, small carpal, most medial in proximal row, sesamoid bone, attachment site for flexor retinaculum muscle, single art. facet with triquetral
Pisiform
Most lateral of the distal row carpals, saddle-shaped art. facet for MC1 and smaller facet for MC2
Trapezium
Prominent, raised ridge of bone on palmar surface, attachment site for flexor retinaculum on Trapezium
Trapezial ridge
Boot shaped carpal, smallest in distal row, only articulates with MC2 (in terms of MC’s)
Trapezoid
Head shaped carpal, large, articulates with MC3 and MC2 (lesser)
Capitate
______ of capitate articulates proximally with scaphoid and lunate
head
Wedge-shaped carpal, 5 art. facets, most medial of distal row
Hamate
Prominent hook shaped bony projection on palmar side of hamate, attachment site for flexor retinaculum
hamulus
All attachments for flexor retinaculum muscle
Scaphoid, trapezium, pisiform, hamate
