CONNECTIVE TISSUE

-
CONNECTIVE TISSUE DEFINITION

 Connective tissue, group of tissues in the body that maintain the form of the body and its organs and provide cohesion and internal support. The connective tissues include several types of fibrous tissue that vary only in their density and cellularity, as well as the more specialized and recognizable variants—bone, ligaments, tendons, cartilage, and adipose(fat) tissue.





Randomly oriented collagenous fibres of varying size in a thin spread of loose areolar connective tissue (magnified about 370 ×).

COMPONENTS OF CONNECTIVE TISSUE
All forms of connective tissue are composed of (1) extracellular fibres, an amorphous matrix called ground substance, and  stationary and migrating cells. The proportions of these components vary from one part of the body to another depending on the local structural requirements. In some areas, the connective tissue is loosely organized and highly cellular; in others, its fibrous components predominate; and in still others, the ground substance may be its most conspicuous feature. The anatomical classification of the various types of connective tissue is based largely upon the relative abundance and arrangement of these components.





 TYPES OF CONNECTIVE TISSUE

Cartilage

Imagen relacionadaCartilage is a type of supporting connective tissue. Cartilage is a dense connective tissue, consisting of the chondrocyte cells. Cartilage connective tissue includes hyaline cartilage, fibrocartilage and elastic cartilage. The fibers in the cartilage connective tissue include collagen and elastic fibers. Cartilage connective tissue has limited ground substance and can range from semisolid to a flexible matrix.

Bone

Imagen relacionadaBone is another type of supporting connective tissue. Bone, also referred to as osseous tissue, can either be compact (dense) or spongy (cancellous), and contains the osteoblasts or osteocytes cells. Bone connective tissue is made up of collagen fibers and has rigid, calcified ground substance.

Adipose

Resultado de imagen de CONNECTIVE ADIPOSE TISSUEAdipose is another type of supporting connective tissue that provides cushions and stores excess energy and fat. It contains reticular cells and is made up of reticular fibers. The extracellular substance of adipose connective tissue is made up of a tight pack of cells with a small amount of gelatinous ground substance.

Blood

Imagen relacionadaBlood, also referred to as vascular tissue, is a type of fluid connective tissue. Blood connective tissue contains three types of cells including erythrocytes, leukocytes, and thrombocytes. The fibers found in blood connective tissue are soluble proteins that form during clotting and the extracellular substance making up blood connective tissue is the liquid blood plasma.

Comentarios

Publicar un comentario

Entradas populares de este blog

HUMAN EMBRYOGENESIS (STEP 1-4)

-
Imagen
Embryogenesis, the first eight weeks of development after fertilization, is an incredibly complicated process. It’s amazing that in eight weeks we’re transforming from a single cell to an organism with a multi-level body plan. The circulatory, excretory, and neurologic systems all begin to develop during this stage. Luckily, like with many complex biological concepts, fertilization can be broken down into smaller, simpler ideas. The big idea of embryogenesis is going from a single cell to a ball of cells to a set of tubes.  Starting from the very beginning Step 1 : a  zygote  is the single cell formed when an egg and a sperm cell fuse; the fusion is known as fertilization Step 2 : the first 12-to 24-hours after a zygote is formed are spent in  cleavage  – very rapid cell division The zygote’s first priority is dividing to make lots of new cells, so it’s first few days are spent in rapid mitotic division. With each round of division, it doubles in cell number. This divisio
Leer más

CENTRAL NERVOUS SYSTEM

-
Imagen
The Central Nervous System (CNS) The central nervous system is divided into two major parts: the brain and the spinal cord.   Firstly,we are going to talk about the brain. Parts of the Human Brain and their Subdivisions Human encephalon resembles, in structure and function, with that of the other vertebrates. The scientists reveal that parts of the human brain are Forebrain, Midbrain & Hindbrain and the related structures that collectively act as a single highly specialized unit. These parts work in coordination and perform  different functions of brain . More specifically, it is divided into five major regions, namely, telencephalon, diencephalon or inter-brain, myelencephalon (hindbrain/medulla oblongata), metencephalon and mesencephalon (midbrain). Here follows a precise but comprehensive description of each of the above given divisions. Telencephalon/Cerebrum—Anterior Part Of Forebrain Further composed of cerebral cortex, limbic and basal ganglia, it is th
Leer más

SKELETAL SYSTEM (PHYSIOLOGY)

-
Imagen
Support and Protection The skeletal system’s primary function is to form a solid framework that supports and protects the body’s organs and anchors the skeletal muscles. The bones of the axial skeleton act as a hard shell to protect the internal organs— from damage caused by external forces. The bones of the appendicular skeleton provide support and flexibility at the joints and anchor the muscles that move the limbs. Movement The bones of the skeletal system act as attachment points for the skeletal muscles of the body. Almost every skeletal muscle works by pulling two or more bones either closer together or further apart. Joints act as pivot points for the movement of the bones.  Hematopoiesis Red bone marrow produces red and white blood cells in a process known as hematopoiesis. Red bone marrow is found in the hollow space inside of bones known as the   medullary cavity .  The amount of red bone marrow drops off at the end of puberty, replaced by yellow bone marrow.
Leer más