A tubule is a very small tube or fistular structure. In medicine a fistula (pl fistulas or fistulae is an abnormal connection or passageway between two Epithelium -lined organs or vessels that normally do not connect
A system of surface-connected membranes in muscle that enables a nerve impulse to travel to the interior of the muscle fibre.
In anatomy, a tubule is a minute tube lined with glandular epithelium. Anatomy (from the Greek anatomia, from ana separate apart from and temnein, to cut up cut open is a branch of Biology that is the consideration A gland is an organ in an animal's body that synthesizes a substance for release such as Hormones or Breast milk, often into the Bloodstream In biology and medicine epithelium is a tissue composed of cells that line the cavities and surfaces of structures throughout the body