人掌骨的动脉

THE ARTERIAL SUPPLY OF THE HUMAN METACARPUS

The arterial supply of the human metacarpus was studied in 166 specimens fromfresh cadavers of different ages ranging from 6(1/2) months prenatally to 89 years oldby injection,chemical debridement and clearing techniques.The arterial supply ofthe metacarpus is mainly derived from the nutrient artery,the periosteal arteries, the epiphyseo-metaphyseal arteries and the pseudoepiphyseal arteries.The nutrientand periosteal arteries mainly supply the diaphyses of the metacarpus.The ascendingand descending branches of the nutrient artery give off radial twigs which enter thecortex to supply the inner two-thirds or three fourth of the compact substance.Theperiosteal arteries which give off a few twigs penetrating the cortex and only supplythe outer third or quarter of the compact substance of the metacarpus.The epiphyseo-metaphyseal arteries and the pseudoepiphyseal arteries mainly supply the extremitiesof the metacarpus.The sources of the nutrient arteries to the metacarpus vary with the differentbones.The nutrient artery to first metacarpal bone is consistently originated fromthe princeps pollicis artery,while the nutrient arteries to the other metacarpal bonesare mainly derived from the palmar metacarpal arteries,the deep palmar arch andits perforating branches.The periosteal arteries of the metacarpus mainly arise fromthe princeps pollicis artery,the palmar metacarpal arteries,the dorsal metacarpalarteries,the deep palmar arch and its perforating branches.These periosteal arteriesdivide into smaller branches and anastomose with each other and form an abundantloop-like vascular network in the periosteum of each metacarpal bone.The epiphy-seo-metaphyseal arteries and the pseudoepiphyseal arteries are mainly originatedfrom the proximal and distal arterial rings which situate at the proximal and distalextremities of each metacarpal bone.