Mucous membrane

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Mucous membrane
LAYERS:
serosa
longitudinal muscle
myenteric plexus
circular muscle
submucosal plexus
submucosal
mucosal
Section of the human esophagus. Moderately magnified. The section is transverse and from near the middle of the gullet.
a. Fibrous covering.
b. Divided fibers of longitudinal muscular coat.
c. Transverse muscular fibers.
d. Submucous or areolar layer.
e. Muscularis mucosae.
f. Mucous membrane, with vessels and part of a lymphoid nodule.
g. Stratified epithelial lining.
h. Mucous gland.
i. Gland duct.
m’. Striated muscular fibers cut across.
Latin tunica mucosa
Gray's subject #242 1110
Dorlands/Elsevier t_22/12831913

The mucous membranes (or mucosae; singular mucosa) are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. They line various body cavities that are exposed to the external environment and internal organs. It is at several places continuous with skin: at the nostrils, the lips, the ears, the genital area, and the anus. The sticky, thick fluid secreted by the mucous membranes and gland is termed mucus. The term mucous membrane refers to where they are found in the body and not every mucous membrane secretes mucus.

Body cavities featuring mucous membrane include most of the respiratory system. The glans penis (head of the penis) and glans clitoridis and the inside of the prepuce (foreskin) and clitoral hood are not mucous membranes; however, the urethra is a mucous membrane. The secreted mucus traps the pathogens in the body, preventing any further activities of diseases.

Contents

[edit] Components

[edit] Some examples of mucosa

[edit] Additional images

Wall of the ureter.

Section of mucous membrane of human stomach, near the cardiac orifice.

General structure of the gut wall showing the Mucosa.

[edit] See also

[edit] External links

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Tissue layers
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