Tubular gland
If glands are categorized by shape, tubular glands contrast with alveolar glands. Tubular glands retain their shape as a tube throughout their length whereas alveolar glands have a saclike secretory portion.
Tubular glands are further classified as one of the following types:
| Type | Description | Location | |
| simple tubular or simple straight tubular or straight tubular | the gland is a uniform tube | Small intestine, uterine glands | |
| coiled tubular or simple coiled tubular | the gland is coiled without losing its tubular form | sweat glands | |
| simple branched tubular or compound tubular | branching occurs in the tubes | pyloric glands of stomach |