My hearty greetings to one and all. So far we are discussing so many basic topics regarding human body. so that it would be easier for you to understand the abnormalities and disease conditions better.
Now we are going to discuss about "THE MEMBRANES ". hope this will be useful for you all to relate with the body parts and understand our human systems better.
I refered the syllabus and preparing slides in small topics so that it would be easier for you to review .I'm also running an YouTube channel in the name "NURSING ABSTARACT" and posting videos in both English and Tamil. Support me by pouring out your valuable suggestions in the comments sections.
channel link:
https://www.youtube.com/channel/UCZrabu-CtMa5AEexu1j2GNw
Tamil video:https://youtu.be/d5HYmgaPE4o
English video:https://youtu.be/zImNRYfbkWU
MEMBRANES:
A thin layer of tissue covering a surface, or lining a cavity, space or organ.
TYPES OF MEMBRANES:
The membranes are classified into
epithelial membrane &
connective tissue membrane
The epithelial membranes are classified into
1.mucous membrane
2. serous membrane
3.cutaneous membrane.
The connective tissue membrane are mainly classified into
1.synovial membrane.
EPITHELIAL MEMBRANE:
They are formed from epithelial tissue attached to a layer of connective tissue.
They line many internal structures and cavities.
The mucous which contains glands , serous which secrete fluids and cutaneous which makes up the skin.
MUCOUS MEMBRANE:
This is the moist lining of the alimentary, respiratory and genitourinary tracts and is sometimes referred to as the mucosa. The membrane surface consists of epithelial cells and in that some of the cells produce a secretion called mucus, a slimy tenacious fluid. As the cells fills up with the mucus they have the appearance of a goblet or flask and are known as goblet cells. As the fluid accumulates the cell becomes distended and finally burst, discharging the mucus onto the free surface.
Organs lined by mucus membrane has a moist slippery surface.
In respiratory tract it traps the inhaled particles preventing them from entering the alveoli of the lungs. Mucus protects the membrane from drying, mechanical and chemical injury.
SEROUS MEMBRANE:
Serous membrane or serosa, secrete serous watery fluid.
They consist of a double layer of loose areolar connective tissue which are being lined by simple squamous epithelium.
The parietal layer lines a cavity and the visceral layer surrounds the organ (viscera) within the cavity.
The two layers are separated by serous fluid secreted by epithelium
There are three sites where the serous membranes are found:
The pleura lining the thoracic cavity and surrounding the lungs.
The pericardium lining the pericardial cavity and surrounding the heart.
The peritoneum lining the abdominal cavity and surrounding the abdominal organs
The serous fluid between the visceral and parietal layers enables an organ to glide freely within the cavity without being damaged by friction between it and the adjacent organs.
For example the heart changes its size and shape during each beat and friction damage is prevented by the arrangement of pericardium and the serous fluid.
CUTANEOUS MEMBRANE:
Cutaneous membrane is the technical term for our skin.
It is located outside the body and is known as skin.
The skins primary role is to help protect the rest of the body tissues and organs from physical damage such as abrasions ,chemical damage and biological damage such as micro organisms.
It is composed of keratinized stratified squamous epithelium.
Its underlying dermis is mostly dense connective tissue.
CONNECTIVE TISSUE MEMBRANE:
The connective tissue membrane is formed from connective tissue.
These membranes encapsulate organs such as kidneys and line our movable joints.
The synovial membrane is a type of connective tissue membrane that lines the cavity of a freely movable joint.
SYNOVIAL MEMBRANE:
This membrane lines the cavities of movable joints and surrounds tendon that could be injured by rubbing against bones. Eg: over the wrist joint.
It is not an epithelial membrane, but instead consists of areolar connective tissue and elastic fibers.
Synovial membrane secretes clear, sticky, oily synovial fluid, which lubricates and nourishes the joints.
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Thank you for supporting me . ;I'll try my level best to give the accurate and updated knowledge in all the topics . please visit my YouTube channel named Nursing Abstract ; for viewing a brief explanation in both Tamil and English . see you again in my next post.