Synopsis On Tissues
Cells are a crucial part of the body’s structure, forming tissues when clustered together and performing the same functions. Histology is the study of tissues and contributes to the larger field of anatomy by providing a structural basis for understanding the physiology of organs.
Primarily, there are four types of tissues that form the fabric of the body:
- Epithelial tissue - provides covering
- Connective tissues - renders support
- Nervous tissues - Responsible for control
- Muscle tissues - enabling movement
Let us take a look at each one briefly:
Types of Tissues
Epithelial Tissue
Epithelium, also known as epithelial tissue, is a type of tissue that lines the cavities and surfaces of the body. It can be found in the body as a lining of the internal and external surfaces.
Glandular Epithelium - Patterns the Glands
The outer layer of the skin, as well as the open cavities of the respiratory, digestive, and cardiovascular systems, is composed of a lining and covering epithelium which serves to protect the organs and walls of the closed ventral body cavity.
The epidermis is an example of epithelium, which generally forms a barrier between different structures. Most particles must pass through this type of tissue in order to access the structures it is protecting. For instance, the epidermis lines the urinary bladder, separating the cells underneath the bladder wall from the urine.
The epithelial tissue accomplishes the following functions:
Protection
Absorption
Excretion
Sensory Reception
Secretion
The skin acts as a barrier, protecting underlying tissues from invasion by foreign particles, chemicals, and mechanical injury. It also contains nerve endings that are sensitive to stimuli applied to its surface.
The distinguishing characteristics of epithelial tissue are:
- Avascular
- Composed of cells closely packed together
- Has a free surface
- Has a basement membrane
- Regenerates quickly
Have Specialized Connections
Property of Polarity
Supported by connective tissue
Avascular, Innervated
Property of Regeneration
Connective Tissue
The primary tissue found almost everywhere in the body is widely distributed, but the amount of it in different structures varies. Its role is involvement in…
Protection
Support and Binding
Provide insulation
Transporting Substances in the Body
The cartilage and bones provide protection and support to the organs of the body, forming the hard underpinnings of the skeleton. Additionally, fat-cushions protect and insulate the organs of the body, as well as providing reserve energy fuel.
The classification of Connective Tissue Types is shown below:
Connective Tissue
Connective Tissue Proper
Loose Connective Tissue
Areolar
Adipose
Reticular
Dense Connective Tissue
Regular
Irregular
Elastic
