The document summarizes the structure and function of the insect body wall (exoskeleton or integument) and the process of moulting (ecdysis). It describes the main layers of the cuticle (epicuticle, exocuticle, endocuticle), their composition and functions. It also discusses the cellular layer (epidermis), cuticular appendages, glands and endoskeleton. The process of moulting is controlled by hormones and involves the detachment of the old cuticle (apolysis) and formation of a new cuticle in multiple steps over the moulting period (stadium). The discarded exoskeleton after moulting is called an exuv
wing is one of the most characterstic feature of insects.
In majority of insects mesothorax and meta thorax carries a pair of wings.
On the basis of presence of wings class insecta is devided into 2 sub classes :
1. APTERIGOTA
2. PTERIGOTA
Structure of integument its function, moulting.pptxvineetha43
Slide 1
Insect body wall is called as Integument or Exoskeleton.
It is the external covering of the body which is ectodermal in origin
It is rigid, flexible, lighter and stronger
Slide 2
Structure of body wall consists of an outer non cellular part (cuticle), an inner cellular layer (epidermis), basement membrane
Epidermis - It is an inner unicellular layer resting on basement membrane
It’s functions:
i. Cuticle secretion &
Secretion of moulting fluids
ii. Digestion and absorption of old cuticle
iii. Wound repairing
iv. Gives surface look, protection, muscle attachment
v. Water-tight barrier against desiccation, and a sensory interface with environment.
Slide 3
Cuticle - It is an outer non cellular layer comprising three sub layersSub layers of cuticle
i. Endocuticle
Innermost and thickest layer made up of chitin and arthropodin. This layer is colourless, soft and flexible
ii. Exocuticle
Outer layer, much thicker & harden with composition of chitin and sclerotin. This layer is dark in colour and rigid
wing is one of the most characterstic feature of insects.
In majority of insects mesothorax and meta thorax carries a pair of wings.
On the basis of presence of wings class insecta is devided into 2 sub classes :
1. APTERIGOTA
2. PTERIGOTA
Structure of integument its function, moulting.pptxvineetha43
Slide 1
Insect body wall is called as Integument or Exoskeleton.
It is the external covering of the body which is ectodermal in origin
It is rigid, flexible, lighter and stronger
Slide 2
Structure of body wall consists of an outer non cellular part (cuticle), an inner cellular layer (epidermis), basement membrane
Epidermis - It is an inner unicellular layer resting on basement membrane
It’s functions:
i. Cuticle secretion &
Secretion of moulting fluids
ii. Digestion and absorption of old cuticle
iii. Wound repairing
iv. Gives surface look, protection, muscle attachment
v. Water-tight barrier against desiccation, and a sensory interface with environment.
Slide 3
Cuticle - It is an outer non cellular layer comprising three sub layersSub layers of cuticle
i. Endocuticle
Innermost and thickest layer made up of chitin and arthropodin. This layer is colourless, soft and flexible
ii. Exocuticle
Outer layer, much thicker & harden with composition of chitin and sclerotin. This layer is dark in colour and rigid
Anatomy and elementary physiology of integumentry systems of insectsMrpsyco
This presentation include anatomy and physiology of integumentry system of insects ,which will include the process of formation of integumentry system.
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Insect body wall: It’s structure,cuticular outgrowth, colouration and special...N.m.c.a
Insect body wall: It’s structure,cuticular outgrowth, colouration and special integumentary structures in insects with their functions and modification in different orders of insects.
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.
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
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
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• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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Overview on Edible Vaccine: Pros & Cons with Mechanism
Insect body wall its structure, function and Molting
1. Dr. T. KRISHNA CHAITANYA
Assistant Professor (Agricultural Entomology)
School of Agricultural Science & Technology, NMIMS, Shirpur
Body wall-its structure and function &
Moulting (Ecdysis) 1
2. • Insect body wall is called as Integument or Exoskeleton.
• It is the external covering of the body which is ectodermal in origin.
• It is rigid, flexible, lighter, stronger and variously modified in different body parts to
suit different modes of life.
• Structure Body wall consists of an inner cellular layer (Epidermis) and an outer non
cellular part (Cuticle).
• Epidermis It is an inner unicellular layer resting on basement membrane with the
following function.
• i. Cuticle secretion
• ii. Digestion and absorption of old cuticle
• iii. Wound repairing
• iv. Gives surface look
2
4. • Cuticle
It is an outer non cellular layer comprising of three sub layers
i. Endocuticle
Compared to others it is the inner and thickest layer. This layer is made up of
Chitin and arthropodin. This layer is colourless, soft and flexible.
4
5. ii. Exocuticle
Outer layer, much thicker with the composition of Chitin and
sclerotin. This layer is dark in colour and rigid.
5
6. iii. Epicuticle:
Outer most layer which is very thin. Pore canals present in the
exocuticle helps in the deposition of epiculticle. This layer is
differentiated into the following layers.
6
7. Epicuticle:
a. Inner epicuticle: It contains wax filaments
b. Outer epicuticle: It makes the contact with cuticulin
c. Cuticulin : Non chitinous polymerised lipoprotein layer.
7
8. 8
d. Wax layer: It contains closely packed wax molecules which
prevents desiccation.
e. Cement layer: Outer most layer formed by lipid and tanned protein.
It protects wax layer.
9. • Composition of cuticle
• i. Chitin: It is the main constituent of cuticle, which is Nitrogenous polysacharide
and polymer of Nacetylglucosamine. It is water insoluble but soluble in dilute acids,
alkalies and organic solvents.
• ii. Arthropodin: An untanned cuticular protein, which is water soluble.
• iii. Sclerotin: Tanned cuticular protein, which is water insoluble.
• iv. Resilin: An elastic cuticular protein responsible for the flexibility of sclerites,
e.g., wing articulatory sclerites.
9
10. • ENDOSKELETON
• Cuticular in growth of body wall providing space for muscle attachment is known as
endoskeleton.
There are two types
i. Apodeme: Hollow invagination of body wall.
ii. Apophysis: Solid invagination of body wall.
10
is that apodeme is (anatomy) an ingrowth of the arthropod exoskeleton, serving as an attachment
site for muscles while apophysis is (anatomy) a natural outgrowth, swelling or enlargement,
usually of an organism; a protuberance on a bone.
11. • CUTICULAR APPENDAGES:
• Non-cellular:
• Non-cellular appendages have no epidermal association, but rigidly attached.
e.g. minute hairs and thorns.
11
12. • Cellular: Cellular appendages have eipdermal association.
• Unicellular
• a. Clothing hairs, plumose hairs. e.g. Honey bee. Bristles. e.g. flies.
• b. Scales - flattened out growth of body wall e.g. Moths and butterflies
• c. Glandular seta. et. caterpillar
• d. Sensory setae - associated with sensory neuron or neurons
• e. Seta - hair like out growth (Epidermal cell generating seta is known as
Trichogen, while The socket forming cell housing trichogen is known as
Tormogen. Study of arrangement of seta is known as Chaetotaxy).
• Multicellular
e.g. Spur - movable structure
Spine- Immovable structure
12
20. • GLANDS
• Cuticular glands are either unicellular or multicellular.
• Following are some of the examples.
• i. Wax gland - e.g. Honey bee and mealy bug
• ii. Lac gland - e.g. Lac insects
• iii. Moulting gland secreting moulting fluid.
• iv. Androconia or scent scale - e.g.moth
• v. Poison gland - e.g. slug caterpillar
20
26. • Functions of Body wall
i. Acts as external armour and strengthen external organs like jaws and ovipositor
ii. Protects the organs against physical aberation, injurious chemicals, parasites,
predators and pathogen.
iii. Internally protects the vital organs, foregut, hindgut and trachea.
iv. Provides space for muscle attachment and gives shape to the body.
v. Prevents water loss from the body.
vi. Cuticular sensory organs helps in sensing the environment.
vii. Cuticular pigments give colour.
26
27. MOULTING (Ecdysis)
• Ecdysis
• Periodical process of shedding the old cuticle accompanied by the formation of
new cuticle is known as moulting or ecdysis.
• The cuticular parts discarded during moulting is known as Exuvia.
• Moulting occurs many times in an insect during the immatured stages before
attaining the adult-hood.
• The time interval between the two subsequent moulting is called as Stadium and
the form assumed by the insect in any stadium is called as Instar.
27
28. • Steps in moulting
• Behaviroual changes: Larva stops feeding and become inactive.
• Changes in epidermis: In the epidermis cell size, its activity, protein content and
enzyme level increases. Cells divide miotically and increases the tension, which
results in loosening of cells of cuticle.
28
29. • Aolysis: Detachment of cuticle from epidermis
• Formation of Sub cuticular space
• Secretion of moulting gel in the sub cuticular space which is rich with chitinase and
protease.
• New epicuticle formation: Lipoprotein layer (cuticulin) is laid over the epidermis.
29
30. • Procuticle formation: Procuticle is formed below the epicuticle.
• Activation of moulting gel: Moulting gel is converted into moulting fluid rich in
enzymes. This activates endocuticle digestion and absorption.
• Wax layer formation: Wax threads of pore canals secrete wax layer.
• Cement layer formation : Dermal glands secretes cement layer (Tectocuticle).
30
31. • Moulting: This involves two steps
• Rupturing of old cuticle: Insect increases its body volume through intake of air or
water which enhances the blood flow to head and thorax. There by the old cuticle
ruptures along predetermined line of weakness known as ecdysial line
• Removal of old cuticle: Peristaltic movement of body and lubricant action of
moulting fluid helps in the removal of old cuticle. During each moulting the
cuticular coverings discarded are the cuticular of legs, internal linings of foregut and
hindgut and trachea.
• Formation of exocuticle: The upper layer of procuticle develops as
exocuticle through addition of protein and tanning by phenolic substance.
• Formation of endocuticle: The lower layer of procuticle develops as
endocuticle through addition of chitin and protein. This layer increases in
thickness.
31
33. • Control of Moulting: It is controlled by endocrine gland like prothoracic gland
which secrete moulting hormone. Endocrine glands are activated by prothoracico-
tropic hormones produced by neurosecretory cells of brain.
33
34. • Moulting: Shedding of old cuticle accompanied by formation of new cuticle is
called Moulting or Ecdysis.
• Detachment of cuticle from the epidermis is apolysis
• The time interval between two moults is called a stadium
• The formation of an insect during a stadium is called an instar
• The cast off skin by an insect is called as exuviae
• Chitin which makes up the exo-and endocuticle is a nitrogenous polysaccharide
formed from long chains N-acetyl D-glucosamine units (C8H13O5N)n
34