Page 79 - PG 101-Course notes مذكرة النظري 24-25 with spec

Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD

D) Secretory Tissue

 Glands classified into:

Secretory: retain their secretions inside the secreting cells.

Excretory: secretions are exuded outside the secreting cells.

1- Internal glands:

Have central cavities in the tissue. These cavities originate in two ways:

First Second
By gradual separation of Through the dissolution of entire

cells, through the dissolution cells, leaving a space in which the
of the middle lamella. This secretion accumulates. It is called
type is called schizogenous. (lysigenous) and the cavities usually
● It is characterized by the contain the remains of cells.

regular cavity and by the
presence of special layer of
small cells round the internal

cavity.
● These constitute the
epithelium which discharge

their secretion into the
central cavity.

55