
via • link3. Ramulus, noun. In botany, a small branchlet or twig; in zoology, any such fine, branching outgrowth, like those that finger forth from the bodies of corals or hydroids. In medicine, the final and most narrow offshoots of a blood vessel or a nerve. In all fields, a little-used, somewhat archaic term. The diminutive form of ramus, Latin for “branch.”
Sometimes growth means thinning, splitting, elongation. What begins as a burly trunk or the sturdy fist of a heart ends in the shape of a thread.