Identify the muscles colored yellow and green. Which of these muscles is responsible for abduction, and at which joint does this occur?
Yellow: Dorsal interossei, Green: Palmar interossei; DAB, PAD
Name, classification, articular surface
Radiocarpal(wrist joint); Synovial, biaxial, condyloid; Distal end of radius-Distal radioulnar joint articular disc-Proximal row of carpals (except pisiform)
Identify the muscle colored green in the figure, which joint does this muscle act on, and what movement does it produce at this joint?
Opponens pollicis, Carpometacarpal joint 1: Thumb opposition
Identify this structure and describe its function
Extensor aponeurosis/extensor expansion/dorsal digital expansion; ensures simultaneous extension of interphalangeal joints in each finger when releasing grip
Identify this muscle, and describe its attachments and actions
Lumbricals, associated with the tendons of FDP and attach to the extensor expansion, flex MCP and extend IP
Name, classification, and articular surface
Metacarpophalangeal (MCP) joints; Synovial, biaxial, condyloid; Head of metacarpals and Bases of proximal phalanges
Identify the structure highlighted within the orange outline, describe its general function
Flexor retinaculum, prevent bowstringing and protect underlying structure
Name, classification, and articular surface of this joint
Carpometacarpal (CMC) joints; trapezoid - capitate - hamate - hamate; Synovial, multiaxial, plane
Identify the muscle colored green, red, and blue in the figure
Green: Flexor digiti minimi brevis, Red: Abductor digiti minimi,Blue Opponens digiti minimi
Movement of this joint
Metacarpophalangeal (MCP) joints; • extension/flexion • Adduction/abduction Circumduction