Areolar Tissue is loose connective tissue that consists of a meshwork of collagen, elastic tissue, and reticular fibres-with many connective tissue cells in between the meshwork of fibres. The fibres that form the mesh structure of areolar tissue include:
Normal growth rates for Emerald Green (Thuja occidentalis 'Smaragd') are between 6 to 12 per year once established and tapering off as they reach about 12' to 15'. I'd be suprised to see more than about 18 per year even in ideal conditions.
Plant taxonomy classifies 'Emerald Green' Arborvitae under Thuja occidentalis. 'Emerald Green' arborvitae is one of its cultivars. The common name for these conifers is often misspelled, arbor vitae (technically, when spelled as two words, it's a part of the human anatomy, not a tree).