In 15 human heads, bilateral injection through the common carotid artery was carried out in order to find out whether there are any more or less distinctly limited segments of the oral mucosa supplied by certain arterial branches that would represent the nutritive pedicles of the respective segments. It seems that the gingiva libera of the buccal side in the region of the upper molars and premolars represents such a segment. In spite of small anastomoses between the right and left sublingual arteries, one half of the sublingual mucosa may also be considered as a segment. The same refers to the mucosa of one half of the hard palate. Even smaller units of varying extent of the palatine mucosa maybe differentiated as distinct vascular areas. For the majority of the oral mucosa, however, no limitations of vascular segments with distinct arterial pedicles could be discovered.