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:
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:
Tubular gland