Anatomy of the Tracheal Mucous Glands in Man

Mucous Glands in the Middle Ear – What Is Known and What Is Not

“…The described pathological gland formation resembles very much the embryological gland formation in the lower respiratory tract of fetuses [32]. However, there is no differentiation to ciliary cells within the gland duct in the lower respiratory tract, as is seen in pathological ducts in the middle ear ( fig.…”

Postnatal development of peroxidase activity in the laryngeal and tracheal epithelia and glands of specific pathogen free rats.

“…On the other hand, rat tracheal gland begin to develop around 6 days after birth and show positive PAS-aIcian blue stain to demonstrate mucopolysaccharide synthesis on day 8 (16). It is known that tracheal glands are formed by epithelial cells that penetrate into the con- nective tissue (13,16,18). In our experiment, some epithelial cells of the rat trachea invaginated into the matrix on day 5, and PO activity became demonstrated in the gland terminal tubule cells 11 days after birth.…”

Murine Submucosal Glands Are Clonally Derived and Show a Cystic Fibrosis Gene–Dependent Distribution Pattern

“…During our studies, we examined the structure of over 120 chimeric mouse SMGs and found no evidence of glands being derived either from more than one progenitor cell or through polygland interaction. Further, no previous in vivo studies of SMGs in the human have reported finding glands with more than one ductal opening (24,25). From our findings we conclude that the method of gland morphogenesis seen in the xenograft model does not operate in mice.…”