Exam 3 Flashcards
Bones of the wrist and hand
Carpals: 7 (Hamate, Pisiform, Triquetrum, Lunate, Scaphoid, Capitate, Trapezium, Trapezoid)
Metacarpals: 5
Phalanges: 14
Fixed portion vs Adaptive Portion bones
Fixed: provides stable base, distal row of carpals and 2nd and 3rd MC
Adaptive: provides for grasp and manipulation; MC 1, 4, and 5, and phalanges
Arches of the hand
Proximal Transverse Arch: Thru carpals, fixed (by flexor retinaculum)
Distal Transverse Arch: thru metacarpal heads, mobile
Longitudinal Arch: mobile
Components of the “wrist complex”
Radius, Ulna, and TFCC
Radiocarpal (Ellipsoid) Joint
Function: Flexion and Extension, Ulnar and Radial Deviation
Midcarpal (Plane - multiple) Joint
Functions: Flexion and Extension, Ulnar and Radial Deviation (major contributor)
Common Carpometacarpal (Plane) Joint
Functions: Flexion and Extension (some), Gliding (5th > 4th > 3rd)
Thumb Carpometacarpal (Saddle) Joint
Functions: Flexion and Extension, Abduction and Adduction, Rotation during Opposition
Pisiform (Plane)
Functions: Improves moment arm of FCU, Gliding
TFCC (Ulno-Menisco-Triquetral Joint)
Functions: Pronation and Supination, All Radiocarpal Joint Motions, Clinical Joint
Extrinsic Ligaments of the Carpus
Attachments outside of the carpals
Radial Collateral Ligament Ulnar Collateral Ligament Palmar Radiocarpal Ligaments Palmar Ulnocarpal Ligaments Dorsal Radiocarpal Ligaments
Radial Collateral Ligament
Origin: Radial Styloid Process
Insertion: Scaphoid
Surface: Mostly Palmar
Function: Checks ulnar deviation
Ulnar Collateral Ligament
Origin: Ulnar Styloid Process
Insertion: Triquetrum, Pisiform, Base of 5th MC
Surface: Mostly palmar
Function: Checks Radial Deviation
Palmar Radiocarpal Ligaments
Origin: Distal Radius (Palmar)
Insertion: Lunate, triquetrum, capitate
Surface: palmar
Function: check wrist extension
Palmar Ulnocarpal Ligaments
Origin: Distal Ulna (palmar)
Insertion: Lunate, triquetrum, capitate
Surface: palmar
Function: check wrist extension (least important for checking)
