Explanation:
The twelve-paired cranial nerve is the hypoglossal nerve. Its name is derived from the Greek words glossal, which means tongue, and hypo, which means under. The nerve innervates all of the tongue's extrinsic and intrinsic muscles, serving only as a somatic motor (except the palatoglossus, innervated by vagus nerve).
Explanation:
Collagen fibers are attached to the alveolar bone by means of cellular cementum, which also contains cells. In order to keep the attachment mechanism intact, it is also in charge of small repair of any resorption through continuing deposition. Acellular cementum is devoid of cells and serves primarily as an adaptation mechanism.
