The deep transverse metacarpal ligament (also called the deep transverse palmar ligament) connects the palmar surfaces[citation needed] of metacarpophalangeal joints of all the fingers of the hand except the thumb.[1]
Bade H, Schubert M, Koebke J (1994). "Functional morphology of the deep transverse metacarpal ligament". Annals of Anatomy. 176 (5): 443–50. doi:10.1016/s0940-9602(11)80476-0. PMID7978341.