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Type of connective tissue in animals
"Areolar" redirects here. For other uses, see areola (disambiguation).
Not to be confused with Areola.
Loose connective tissue
Section of dermis. The papillary dermis consists of loose connective tissue.
Details
Identifiers
Latin
textus connectivus laxus
TA98
A04.5.02.020 A16.0.03.006
TA2
7089
TH
H2.00.03.1.00002
FMA
19783
Anatomical terminology
[edit on Wikidata]
Loose connective tissue, also known as areolar tissue, is a cellular connective tissue with thin and relatively sparse collagen fibers. They have a semi-fluid matrix with lesser proportions of fibers. Its ground substance occupies more volume than the fibers do. It has a viscous to gel-like consistency and plays an important role in the diffusion of oxygen and nutrients from the capillaries that course through this connective tissue as well as in the diffusion of carbon dioxide and metabolic wastes back to the vessels. Moreover, loose connective tissue is primarily located beneath the epithelia that cover the body surfaces and line the internal surfaces of the body. It is also associated with the epithelium of glands and surrounds the smallest blood vessels. This tissue is thus the initial site where pathogenic agents, such as bacteria that have breached an epithelial surface, are challenged and destroyed by cells of the immune system.[1]
In the past, the designations areolar tissue, adipose tissue, and reticular tissue have been listed as subsets of loose connective tissue. However, they are no longer considered subsets of loose connective tissue. Loose connective tissue is a subset of connective tissue proper. Furthermore, areolar tissue is the same as loose connective tissue, adipose tissue is a subset of specialized connective tissue, and reticular tissue is the presence of reticular fibers and reticular cells together forming the stroma of hemopoietic tissue (specifically the red bone marrow) and lymphatic tissue organs (lymph nodes and spleen but not the thymus).[1]
Most cell types in loose connective tissue are transient wandering cells that migrate from local blood vessels in response to specific stimuli. Loose connective tissue, therefore, is a site of inflammatory and immune reactions. In areas of the body where foreign substances are continually present, large populations of immune cells are maintained. For example, the lamina propria, the loose connective tissue of mucous membranes, such as those of the respiratory and alimentary systems, contains large numbers of these cells.[1]
^ abcPawlina, Wojciech; Ross, Michael (2020). Histology : a text and atlas : with correlated cell and molecular biology (Eighth ed.). Philadelphia: Wolters Kluwer Health. ISBN 9781496383426.
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Looseconnectivetissue, also known as areolar tissue, is a cellular connectivetissue with thin and relatively sparse collagen fibers. They have a semi-fluid...
Connectivetissue can be broadly classified into connectivetissue proper, and special connectivetissue. Connectivetissue proper consists of loose connective...
substance than looseconnectivetissue. Fibroblasts are the predominant cell type, scattered sparsely across the tissue. This type of connectivetissue is found...
from the mesoderm's dermatome region. It consists primarily of loose connectivetissue, and contains larger blood vessels and nerves than those found in...
Reticular connectivetissue is a type of connectivetissue with a network of reticular fibers, made of type III collagen (reticulum = net or network)....
of one or more layers of epithelial cells overlying a layer of looseconnectivetissue. It is mostly of endodermal origin and is continuous with the skin...
a looseconnectivetissue, hence it is not as fibrous as the underlying connectivetissue of the submucosa.[self-published source?] The connective tissue...
Adipose tissue (also known as body fat or simply fat) is a looseconnectivetissue composed mostly of adipocytes. It also contains the stromal vascular...
the central compartment of the thoracic cavity. Surrounded by looseconnectivetissue, it is an undelineated region that contains a group of structures...
alveolar bone on the other. The PDL consists of principal fibres, looseconnectivetissue, blast and clast cells, oxytalan fibres and Cell Rest of Malassez...
Granulation tissue is new connectivetissue and microscopic blood vessels that form on the surfaces of a wound during the healing process. Granulation tissue typically...
tissue; reticular fibers and ground substance comprise the ECM of looseconnectivetissue; and blood plasma is the ECM of blood. The plant ECM includes cell...
made up of looseconnectivetissue and coated in mucus so as to prevent any friction damage from the intestine rubbing against other tissue. The serosa...
peritoneum) retroperitoneal organs are covered in adventitia (looseconnectivetissue) In the gastrointestinal tract, the muscular layer is bounded in...
modified ependymal cells surrounding a core of capillaries and looseconnectivetissue. Multiple cilia on the ependymal cells move to circulate the cerebrospinal...
reticular connectivetissue and form a network of reticular fibers. Adipocytes are fat cells that are fixed cells in looseconnectivetissue. Their main...
arms, where it is able to travel with little resistance along the looseconnectivetissue within the superficial fascia. Subcutaneous emphysema has a characteristic...
vascularized, looseconnectivetissue. The reticular layer is the deep layer of the dermis and consists of the dense irregular connectivetissue. These layers...
"bandage"), connectivetissues give shape to organs and holds them in place. The main types are looseconnectivetissue, adipose tissue, fibrous connective tissue...
cross-links. Looseconnectivetissue is characterized by few fibers and cells, and a relatively large amount of ground substance. Dense connectivetissue has a...
from the rectum by the recto-uterine pouch, the middle vagina by looseconnectivetissue, and the lower vagina by the perineal body. Where the vaginal lumen...
tissues including mesothelium and endothelium, and the underlying connectivetissue. As seen with the electron microscope, the basement membrane is composed...
ˈmiːzən-/) is a type of loosely organized animal embryonic connectivetissue of undifferentiated cells that give rise to most tissues, such as skin, blood...
The endothoracic fascia is the layer of looseconnectivetissue deep to the intercostal spaces and ribs, separating these structures from the underlying...
the capsule of the testis. It consists of a vascular plexus and looseconnectivetissue. It extends into the testis itself to line the surfaces of individual...
epidural space contains lymphatics, spinal nerve roots, looseconnectivetissue, adipose tissue, small arteries, dural venous sinuses and a network of...
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