0 between bones or connecting bones:
an interosseus ligament
Where it lies upon the abductor pollicis longus and the extensor pollicis brevis, it is accompanied by the dorsal interosseous nerve.
The first dorsal metacarpal artery arises directly from the radial artery before it crosses through the two heads of the first dorsal interosseous muscle.
As it crosses the deep part of the hand, it innervates all the interosseous muscles and the third and fourth lumbricals.
Between these superior articulations and the equivalents on the talus is the tarsal sinus (a canal occupied by the interosseous talocalcaneal ligament).
It is also attached to the interosseous membrane, which attaches to the tibia and fibula.
It is separated from the anterior compartment by the interosseous membrane between the radius and ulna.
The origin of the first palmar interosseous muscle is on the ulnar aspect of the base, and can sometimes extend onto the shaft.
Unlike carpal tunnel syndrome, radial tunnel syndrome does not present tingling or numbness, since the posterior interosseous nerve mainly affects motor function.
