ABSTRACT
The posional relation of the bifurcation of the common carotid artery to the needle which was inserted to the position of the bifurcation presumed from the level of the hyoid bone, as well as its relation to the hyoid bone and the transverse process of the cervical vertebra, has been studied bilaterally with dissection of 19 cadavers.<br>Though most of the inserted needles missed medially from the bifurcation of common carotid artery, all of them were located about the level of the bifurcation in the up-to-downward direction, with two cases directly pricking the bifurcation.<br>The bifurcation of the common carotid artery was mostly located about the level of hyoid bone. Thus, 17 cases out of 19 on the right side and 13 cases out of 18 on the left side were within a range of 1.0mm above or below the hyoid bone.<br>The height of the bifurcation of the common carotid artery against the cervical vertebrae was mostly located between the transverse process of the 3rd and that of the 4th cervical vertebra, 21 cases out of 28 being included within this range.