This document summarizes the five fundamental types of tissues in the human body: epithelial, connective, muscular, nervous, and hemopoietic tissue. It provides detailed descriptions of each type of tissue, including their composition, characteristics, functions, and classifications. Epithelial tissues form protective boundaries and include membrane and glandular epithelia. Connective tissues connect and support other tissues and include loose connective, adipose, dense, cartilage, bone, and blood. Muscle tissues are capable of contraction and include skeletal, cardiac, and smooth muscle. Nervous tissues form the brain, spinal cord, and nerves. Hemopoietic tissue produces blood cells.
Epithelial tissue, also known as the epithelium, is one of the four tissues found in the human body. It exists in various parts of the body, such as our digestive system, outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.
Histology
Junqueira’s Basic Histology Text and Atlas, 15th Ed
Epithelial tissue, also known as the epithelium, is one of the four tissues found in the human body. It exists in various parts of the body, such as our digestive system, outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.
Histology
Junqueira’s Basic Histology Text and Atlas, 15th Ed
detail notes on connective tissue..
Connective tissue (CT) is one of the four basic types of animal tissue, along with epithelial tissue, muscle tissue, and nervous tissue. It develops from the mesoderm. Connective tissue is found in between other tissues everywhere in the body, including the nervous system. In the central nervous system, the three outer membranes (the meninges) that envelop the brain and spinal cord are composed of connective tissue.
All connective tissue consists of three main components: fibers (elastic and collagenous fibers), ground substance and cells. Not all authorities include blood or lymph as connective tissue because they lack the fiber component. All are immersed in the body water.
Structurally, the skin consists of two layers which differ in function, histological appearance and their embryological origin. The outer layer or epidermis is formed by an epithelium and is of ectodermal origin. ... The skin and its appendages together are called the integumentary system. - [Source: Blue Histology - Integumentary System]
The epithelium lining the respiratory tract from the nasal fossa through the bronchi is called the respiratory mucosa and is characterized by a pseudostratified ciliated epithelium with abundant non-ciliated cells known as goblet cells. - [Source: medcell.med.yale.edu/histology/respiratory_system_lab.php]
Every organism is composed of several different types of human body tissue. The human body tissue is another way of describing how our cells are grouped together in a highly organized manner according to specific structure and function. These groupings of cells form tissues, which then make up organs and various parts of the body.
detail notes on connective tissue..
Connective tissue (CT) is one of the four basic types of animal tissue, along with epithelial tissue, muscle tissue, and nervous tissue. It develops from the mesoderm. Connective tissue is found in between other tissues everywhere in the body, including the nervous system. In the central nervous system, the three outer membranes (the meninges) that envelop the brain and spinal cord are composed of connective tissue.
All connective tissue consists of three main components: fibers (elastic and collagenous fibers), ground substance and cells. Not all authorities include blood or lymph as connective tissue because they lack the fiber component. All are immersed in the body water.
Structurally, the skin consists of two layers which differ in function, histological appearance and their embryological origin. The outer layer or epidermis is formed by an epithelium and is of ectodermal origin. ... The skin and its appendages together are called the integumentary system. - [Source: Blue Histology - Integumentary System]
The epithelium lining the respiratory tract from the nasal fossa through the bronchi is called the respiratory mucosa and is characterized by a pseudostratified ciliated epithelium with abundant non-ciliated cells known as goblet cells. - [Source: medcell.med.yale.edu/histology/respiratory_system_lab.php]
Every organism is composed of several different types of human body tissue. The human body tissue is another way of describing how our cells are grouped together in a highly organized manner according to specific structure and function. These groupings of cells form tissues, which then make up organs and various parts of the body.
Tissue Definition
Tissues are groups of cells that have a similar structure and act together to perform a specific function. The word tissue comes from a form of an old French verb meaning “to weave”. There are four different types of tissues in animals: connective, muscle, nervous, and epithelial. In plants, tissues are divided into three types: vascular, ground, and epidermal. Groups of tissues make up organs in the body such as the brain and heart.
Types of Animal Tissues
Connective
Connective tissue connects or separates groups of other tissues. It is found in between all the other tissues and organs in the body. Connective tissue is made up of cells and ground substance, which is a gel that surrounds cells. Most connective tissue, except for lymph and blood, also contains fibers, which are long, narrow proteins. Fibers can be collagenous, which bind bones to tissues; elastic, which allow organs like the lungs to move; or reticular, which provide physical support to cells. Connective tissue also allows oxygen to diffuse from blood vessels into cells.
About 1 in 10 people are have a disorder involving connective tissue. Some connective tissue disorders include sarcomas, Marfan syndrome, lupus, and scurvy, which is a Vitamin C deficiency that leads to fragile connective tissue.
Muscle
Muscle tissue comprises all the muscles in the body, and the specialized nature of the tissue is what allows muscles to contract. There are three types of muscle tissue: skeletal muscle, cardiac muscle, and smooth muscle. Skeletal muscle anchors tendons to bones and allows the body to move. Cardiac muscle is found in the heart and contracts to pump blood. Smooth muscle is found in the intestines, where it helps move food through the digestive tract, and it is also found in other organs like blood vessels, the uterus, and the bladder. Skeletal and cardiac muscles are striated; this means that they contain sarcomeres (a unit of muscle tissue) that are arranged in a uniform pattern. Smooth muscle does not have sarcomeres.
Duchenne muscular dystrophy is an example of a muscle tissue disorder. It is an inherited disorder that causes muscles to atrophy over time. The muscles shorten as they atrophy, which can cause scoliosis and immobile joints. Individuals with the disorder are usually male because the gene responsible for it is found on the X chromosome (of which males have only one).
Nervous
Nervous tissue is found in the brain, spinal cord, and peripheral nerves, which are all parts of the nervous system. It is made up of neurons, which are nerve cells, and neuroglia, which are cells that help nerve impulses travel. Nervous tissue is grouped into four types: gray matter and white matter in the brain, and nerves and ganglia in the peripheral nervous system. The main difference between gray and white matter is that axons of the neurons in gray matter are unmyelinated, while white matter is myelinated. Myelin is a white, fatty substance that insulates neurons and
B.Pharm-Ist sem-HAP-Chapter 3-tissue level of organization.pptxSheetal Patil
Introduction
The term tissue is used to describe a group of cells found together in the body.
Types of tissues
1. Epithelial tissue:]
2. Connective tissue: ]
3. Muscular tissue: ]
4. Nervous tissue: ]
-Development of Tissues
Tissues of the body develop from three primary germ layers: Ectoderm, Endoderm and Mesoderm.
1. Epithelial cell
Epithelial tissue consists of cells arranged in continuous sheets, in either single or multiple layers.
Closely packed and held tightly together.
-General Features of Epithelial Cells:
1. Apical (free) surface
2. Lateral surfaces
3. Basal surface
Basement membrane
Basal lamina
Reticular lamina
-Classification of epithelial tissues
Epithelial tissues are classified according to :
Number of the cell layers formed
1. Simple epithelium (one layer)
2. Stratified epithelium(several layer)
-The shape of the cells
1. Squamous (flat cell)
2. Cuboidal (cube like)
3. Columnar (rectangular)
4. Transitional (variable)
- Glandular Epithelium and Glands
There are main two types of glands
1. Endocrine Glands
2. Exocrine Glands
-Structural Classification of Exocrine Glands
1. Simple gland
2. Compound gland
-Functional Classification of 1. Exocrine Glands
2. Merocrine glands
3. Aprocrine glands
4. Holocrine glands
2. Connective Tissue
-Functions of connective tissues
-Classification of Connective Tissues
Embryonic connective tissue
Mesenchyme
Mucous connective tissue
Mature connective tissue
Loose connective tissue
Areolar connective tissue
Adipose tissue
Reticular connective tissue
Dense connective tissue
Dense regular connective tissue
Dense irregular connective tissue
Elastic connective tissue
Cartilage
Hyaline cartilage
Fibrocartilage
Elastic cartilage
Bone tissue
-Blood and Lymph
--Characteristics of Connective Tissue
1. Extra cellular matrix
2. Fibers
3. Cells of various types
Extracellular matrix of Connective Tissue
-Connective Tissue Cells
1. Fibroblasts
2. Adipocytes (fat cells)
3. Mast cells
4. White blood cells
5. Macrophages
6. Plasma cells
-Connective Tissue Extracellular Matrix;
Ground substance and fibres make up the ECM.
a. Ground substance
-Complex combination of proteins and polysaccharides (hyaluronic acid, chondroitin sulphate dermatan sulphate and keratan sulphate).
b. Fibres
-Collagen fibers
-Elastic fibers
-Reticular fibers
3. Muscular Tissue
-Skeletal muscle tissue (Attached to bone by tendons)
-Cardiac muscle tissue (Heart wall)
-Smooth muscle tissue (Iris of eyes, walls of hollow internal structures such as blood vessels, airways of lungs, stomach, intestine, gall bladder, urinary bladder and uterus)
--Consists of elongated cells called muscle fibers or myocytes for contraction.
--Cells use ATP to generate force.
4. Nervous Tissue
-Neurons or nerve cells
-Neuroglia
--Exhibit sensitivity to various types of stimuli, converts them into nerve impulses (action potentials) and conducts nerve impulses to other neurons.
Tissues, types and functions(Anatomy)- Easy explanationSwatilekha Das
Easy explanation on Tissues , types of tissues and functions of tissues with pictures.......
Easy anatomy topic for 1 st yera GNM and B.Sc nursing students.....
5. EPITHELIAL TISSUE
CHARACTERISTICS:
- consists of continuous cells in apposition
over a large portion of their surface
-cells rest on a continuous extracellular
layer,called the basal lamina
- absence of blood vessels among the cells
(avascularity)
- cells are arranged in sheets or layers
6. FUNCTIONS
1. forms a boundary layer that controls
the movement of substances
between the external and internal
environment
2. may be specialized for absorption and
secretion
3. may bear motile cilia to move a film of
fluid or mucus over its surface
4. on the exterior of the body, resists abrasion
7. CLASSIFICATION
1. FUNDAMENTAL TYPE – EPITHELIAL
2. Forms of Epithelial Tissues
I. Membrane Epithelium
- those lining the body surface cavities or coverings.
II. Glandular Epithelium
=- specialized to synthesize specific products.
- contains extensive rough endoplasmic
8. MEMBRANE EPITHELIUM
CLASSIFICATION
SUBTYPE:
A. According to the number of cell layers.
1.. Simple – made up of only one layer of cells.
2. Pseudostratified – made up of a single layer of
cells but appears to have multiple layers because
of the various locations of the nuclei.
- mostly columnar.
3. Stratified – with several layers of cells and made
up of a distinct shape of cells on the most
superficial layer.
4. Transitional – with several layers of cells but the
thickness of the layer varies depending of the functional
status of the organ.
9.
10. According
to the presence of cell
surface specializations.
1. cilia
2. microvillus / microvilli
a. brush border
b. striated borders
c. stereocilia
3. keratin
11. Classification:
B. According to the shape of the cells
predominating of the most superficial
surface.
1. Squamous – cells are flat or
plate-like.
2. Cuboidal – polygonal and are
about as tall as they are
wide.
3. Columnar – polygonal and are
taller than they are wide.
15. A.2 SPECIFIC SUBTYPES
A. SIMPLE EPITHELIUM
3. A. Simple squamous epithelium
endothelium,mesothelium, parietal layer
of Bowmanns capsule,pulmonary alveoli
31. II. Glandular Epithelium
Classification Principles:
A. Based on the presence or absence of ducts
1. endocrine gland- ductless
2. exocrine- with ducts
B. According to the number of cells that make up a gland:
1. Unicellular – made up of single cell. e.g.
goblet cells
2. Multicellular – many cells make up a gland.
e.g. salivary glands
32. C. According to the type of secretions:
1. Purely Serous – secretes a thin and
watery product
e.g. parotid glands
2. Purely Mucus – thick and viscid
product e.g. goblet cells
3. Muco-serous (Mixed) –
submandibular glands
(predominantly serous)
sublingual glands (predominantly mucus)
4. Cytogenic – produces cells as in the
testis and ovaries
33. D. According to mode of secretion:
1. Merocrine – no destruction of
the secretory cells
e.g. eccrine sweat glands
2. Apocrine – there is partial
destruction of secretory cells
e.g. mammary glands, apocrine
sweat glands of the
axillary areas or groin areas
34. 1. Holocrine – there is total
destruction of secretory cells
e.g. sebaceous glands
35.
36. E. According to morphology
1. Tubular
a. simple tubular – e.g. intestinal
crypts of Lieberkuhn
b. simple coiled tubular – e.g. eccrine
sweat glands of the skin
c. simple branched tubular – e.g.
fundic glands of the stomach
d. compound tubular – e.g. liver, testis
37. 1. Alveolar / Acinar / Saccular
a. simple alveolar –
e.g. sebaceous gland
b. simple branched alveolar –
e.g. sebaceous gland
c. compound alveolar – mammary gland
3. Tubulo-Acinar / Mixed / Racemose
a. compound tubulo-acinar –
e.g. salivary glands
38.
39.
40. II. CONNECTIVE TISSUE
Characterized by large amounts of
extracellular materials that separate
cells from one another
Components of Extracellular Matrix
1. Protein fiber
a. Collagen
b. Reticular
C. Elastic
41. 2. Ground Substance
-is the shapeless background
against which cells and collagen
fibers are seen in the light
microscope. An important
component is proteoglycans made
up of protein and polysaccharide
3. Fluid
42. FUNCTIONS OF CONNECTIVE
TISSUE
1. Enclosing and separating tissues
2. Connecting tissues to one another
3. Supporting and moving
4. Storing energy
5. Cushioning and insulating
6. Transporting
7. Protecting
43. CLASSIFICATION OF CONNECTIVE TISSUE
1. LOOSE OR AREOLAR
- consists of collagen and elastic fiber
- most common cells found are fibroblast
- Fibroblasts, are responsible for the
production of the fibers of the matrix.
2. ADIPOSE
-consists of collagen and elastictissue but
is not a typical connective tissue
- adipose cells are filled with lipids and function
to store energy
- it also acts as a pad and thermal insulator
50. Cartilage = is composed of cartilage
cells or chondrocytes
Types:
a. Hyaline – most abundant of the
cartilages and it covers bones,
forms joints, costal cartilages
that attach ribs to sternum
54. c. Elastic – contains elastic
fibers that appear as coiled
fibers among bundles of
collagen fibers.
e.g. external ear, epiglottis and
auditory tube
56. BONE - is a hard
connective tissue that
consists of living cell and a
mineralized matrix
- osteocytes are located within the
spaces in the matrix called lacunae
2 types:
a. Compact
b. Cancellous
57. BLOOD
Is unique because the matrix is
liquid, enabling blood cells to move
through blood vessels
58. MUSCLE TISSUE
- main characteristic is its ability to
contract or shorten
TYPES OF MUSCLE TISSUE
D. SKELETAL
E. CARDIAC
F. SMOOTH
59. IV. NERVOUS TISSUE
- forms the brain, spinal cord and
nerves
- contains very important cells
which are neurons and neuroglia