There is {HEAD ~ a pour spout} mounted on {TAIL ~ an outside surface} of the neck so that a portion of the neck comprises a septum between the space inside the neck and the pour spout 
mounted on
There is { HEAD ~ a pour spout } mounted on { TAIL ~ an outside surface } of the neck so that a portion of the neck comprises a septum between the space inside the neck and the pour spout
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH