3 - Connective Tissues Flashcards

1
Q

Three embryological germ layers

A

Ectoderm, endoderm,

mesoderm

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2
Q

Germ layers from which epithelium develops from

A

All germ layers

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3
Q

Germ layers that connective tissue develops from

A

Mesenchymal stem cells from mesoderm

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4
Q

Common layout of connective tissue

A

Few cells to a large mass of extracellular matrix which consists of fibres embedded in ground substance containing tissue fluid: extracellular fluid

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5
Q

Dominant component that determines type of connective tissue

A

Extracellular matrix

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6
Q

Cell that produces most fibres in the body (EG: collagen, elastin)

A

Fibroblasts

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7
Q

Molecular makeup of collagen

A

3x alpha polypeptide chains that form a helix.

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8
Q

Type I collagen

A

Connective tissue proper, bone, tendon, ligament

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9
Q

Type II collagen

A

Hyaline cartilage, intervertebral disc

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10
Q

Type III collagen

A

Reticular collagen.

Forms framework in certain tissues (EG: liver, bone marrow)

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11
Q

Type IV collagen

A

Forms basement membrane

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12
Q

Type VII collagen

A

Anchoring fibrils that link to basement membranes

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13
Q

How are type III collagen fibres stained?

A

Not with H&E.

With silver stains

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14
Q

Shape of elastin fibres

A

Branching fibres or sheets

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15
Q

Where is elastin most commonly found?

A

Lung, skin, aorta

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16
Q

Ground substance

A

Viscous, clear substance.
Glycosaminoglycans bound to core protein (forms proteoglycan).
Negative charge attracts Na+, which attracts water.

17
Q

Examples of glycosylated proteins that can be found in ground substance

A

Fibronectin, fibrillin, laminin

18
Q

ECM

A

Fibres + ground substance

19
Q

Resident cells

A
– Fibroblasts, myofibroblasts
– Macrophages
– Mast cells
– Mesenchymal stem cells
– Adipocytes
– Cells of specific CT: adipocytes, osteoblasts, chondroblasts,
haematopoietic cells
20
Q

Wandering cells

A

Lymphocytes, eosinophils, plasma cells, basophils

21
Q

Example of dense connective tissue

A

Tendon

22
Q

Why doesn’t ground substance stain in H&E?

A

Water is removed from it during slide preparation

23
Q
Composition of cartilage
1)
2)
3)
4)
A
1) Predominance of
proteoglycan ground
substance
2) Collagen type II
3) Connective tissue cells are
chondrocytes
4) Main type of cartilage is
hyaline which is avascular
24
Q

Composition of bone
1)
2)

A

1) Predominantly collagenous (type 1) matrix called osteoid which becomes mineralised
2) Connective tissue cells are osteoblasts and osteocytes

25
Q

Basement membrane

A

Interface between support tissues and parenchymal cells e.g. epithelia
Mainly produced by the cells being supported EG epithelia

26
Q
Basement membrane composition
1)
2)
3)
4)
A

Composed of extracellular matrix:
1) Predominantly collagen IV
2) Heparan sulphate
3) Structural glycoproteins: laminins, fibronectin.
4) Collagen VII attaches basement membrane to underlying connective tissue
Laminins and fibronectin are involved in linking integrins of epithelial cells to extracellular matrix

27
Q

Example of basement membrane

A

Basal lamina around muscles

28
Q

Basement membrane functions

A

– Structural support
– Control of epithelial growth
– Links epithelium to underlying tissue
– Selective barrier to nutrients