Nail courses – Joints of hand
Tight joints between cuboid bones.
Tight joints (except for thumb joint). A specific joint between the I. metacarpus and one of the carpal bones. The saddle joint allows particular motions of human hand (thumbs can be set opposite to the little finger).
Limited joints with free motions, the condyle of II-V. metacarpal bones is rounded on both sides, the acetabulum is the flat, elliptical cavity of phalanges. It permits motions of: flexion-extension, adduction-abduction.
Unaxial hinge joints, the motions permitted are: flexion, extension.