The horizontal lands and {HEAD ~ horizontal ribs} extend continuously in a vertical direction from the shoulder region to {TAIL ~ the base portion} 
extend continuously to
The horizontal lands and { HEAD ~ horizontal ribs } extend continuously in a vertical direction from the shoulder region to { TAIL ~ the base portion }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL