Question

What structures are found along lymphatic vessels and are heavily clustered in the armpit, groin, and neck?

Answer 1

Lymph Nodes are found along lymph vessels.

Explanation:

Lymph nodes (erroneously called lymph glands) are a part of the lymphatic system, a component of the body's immune system. Swollen lymph nodes may signal an infection.

There are several groups of lymph nodes, which are small, bean-shaped, soft nodules of tissue.
The ones most frequently enlarged or swollen are found in the neck, under the chin, in the armpits and in the groin.

https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fwww.lymphnotes.com%2Fpic.php%2Fid%2F162%2F&f=1