The space between the gingiva and the tooth that is not attached to the tooth is called?
a. alveolar bone
b. sulcus
c. periodontal ligament
d. gingival margin

The correct option is: b. sulcus

Explanation:

Gingival sulcus refers to the shallow space present between the tooth and the gum tissue, called the gingival margin that surrounds the tooth.

The depth of the healthy gingival sulcus is about three millimeters and it is readily self-cleansable. The gingival sulcus is lined by the sulcular epithelium.

between the two muscle layers is the myenteric or auerbach's plexus, which controls peristalsis. in the colon, the muscularis externa is much thicker because the feces are large and heavy, requiring more force to push along. the stomach has a third layer of muscularis externa: the inner oblique layer.