projections咋么翻译？

Dendritic Cells have long membranous projections and phagocytic capabilities and are widely distributed in lymphoid tissues, mucosal epithelium, and organ parenchyma

projections在这里是否应翻译成“突起“、”触突“，但字典里没有这个意思。如按字典里的翻译，放在这里似乎不合适。