Vectorial synthesis

Vectorial synthesis is synthesis of exported proteins by ribosomes in which the ribosome-nascent chain complex is bound directly to the endoplasmic reticulum (ER) and the nascent peptide chain moves through the ER membrane as it emerges from the ribosome 
Further reading.
Fuller-Pace, F., Peters, G., Dickson, C. "Cell transformation by kFGF requires secretion but not glycosylation", Journal of Cell Biology (1991) 115 (2), pp. 547–555