Histology Lecture 4-Epithelial Membranes

Question 1

What are membranes?

Answer 1

flat sheets of tissue that cover or line a part of the body

Question 2

What do epithelial membranes consist of?

Answer 2

Epithelial membranes consist of epithelial tissue bond to an underlying connective tissue layer. (In other words, it is the epithelial tissue and connective tissue together that compose the epithelial membrane.)

Question 3

Name the 3 types of epithelial membranes:

Answer 3

1.) cutaneous membranes 2.) mucous membranes 3.) serous membranes

Question 4

Describe Cutaneous Membranes.

Answer 4

• also known as skin
• dry membrane
• covers the external surface of the body
• consists of epidermis (keratinized stratified squamous epithelium) and dermis [loose (areolar) connective tissue and dense irregular connective tissue].

Question 5

Describe Mucous Membranes.

Answer 5

• also known as mucosa
• wet membrane;
• lines a body cavity that opens directly to the exterior
• find lining all of the digestive, respiratory, and reproductive tracts, as well as much of the urinary tract;
• consist of lining epithelium and an underlying layer of connective tissue called the lamina propria; this underlying connective tissue is loose (areolar) connective tissue;
• often there are goblet cells and other types of epithelial cells that secrete mucous to prevent cavities from drying out.

Question 6

Describe Serous Membranes

Answer 6

• also called serosa
• wet membrane
• lines body cavities that do NOT open directly to the exterior and the organs that lie within that cavity
• consists of mesothelium (simple squamous epithelium) with underlying loose (areolar) connective tissue

Question 7

What type of membrane is this?

Answer 7

Cutaneous Membrane

Question 8

What type of membrane is this?

Answer 8

Mucous Membrane

Question 9

What type of membrane is this?

Answer 9

Serous Membrane

Question 10

Organs within the ventral body cavity are called _______.

Answer 10

viscera

Question 11

The walls of the ventral body cavity are covered with a _______ _______.

Answer 11

The walls of the ventral body cavity are covered with a serous membrane.

Question 12

Serous membranes can be named according to what it lines/covers:

1) lines the walls of the cavity = ________ layer
2) adheres to the surface of the organ = ________ layer

Answer 12

Serous membranes can be named according to what it lines/covers:

1) lines the walls of the cavity = Parietal Layer
2) adheres to the surface of the organ = Visceral Layer

Question 13

A thin layer of _____ _____ is located between the parietal and visceral layers to ________ _______ when the viscera move

Answer 13

A thin layer of serous fluid is located between the parietal and visceral layers to reduce friction when the viscera move.

Question 14

A serous membrane is named according to where it is located. A membrane lining the pleural cavity and the lung’s external surface, respectively, would be called what?

Answer 14

lining pleural cavity = parietal pleura

lining the external surface of the lungs = visceral pleura

Question 15

A serous membrane is named according to where it is located. A membrane lining the pericardial cavity and the heart’s external surface, respectively, would be called what?

Answer 15

lining the pericardial cavity = parietal pericardium

lining the external surface of the heart = visceral pericardium

Question 16

A serous membrane is named according to where it is located. A membrane lining the abdominopelvic cavity and the external surface of the viscera located in the abdominopelvic cavity, respectively, would be called what?

Answer 16

lining the abdominopelvic cavity = parietal peritoneum

lining the external surface of the viscera located in the abdominopelvic cavity = visceral peritoneum