ToB S5 - Connective Tissue Flashcards Preview

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Flashcards in ToB S5 - Connective Tissue Deck (72)
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1

Define connective tissue

Forms a continuum throughout the body linking muscle, nerve and epithelial tissue in a structural way, but always providing support in metabolic and physical ways

2

Name the 5 types of connective tissue

1) Fibrocollagenous (loose, dense regular and dense irregular)

2) Adipose

3) Blood

4) Bone

5) Cartilage

3

What are the main components of connective tissue?

1) Extracellular fibres

2) Amorphous ground substance

3) Cells Organic components only

4

What are the resident cell types found in connective tissue and their function?

1) Macrophage - ingest foreign material

2) Fibroblasts - Secrete collagen and components of extracellular matrix

3) Mesenchyme - Undifferentiated cells that maintain extracellular matrix

5

What are the visitant cell types found in connective tissue and their function?

Adipocytes - Storage, insulation, shock absorb

Plasma cells - derived from lymphocytes

Leukocytes - derived from blood vessels, production of immunocompetent cells

Mast cells - surround blood vessels, contain granules of heparin and histamines

6

What are the main differences between loose and dense connective tissue?

Loose has higher ratio of cells and ground substance compared to fibres whereas dense has fewer cells and less ground substance and is more densely packed with fibres

7

What are the three types of fibre found in connective tissue?

1) Collagen

2) Elastic

3) Reticular (type III collagen)

8

Where is dense regular connective tissue found?

Tendons and ligaments

9

What is the purpose of dense irregular connective tissue in he dermis of the skin?

Can withstand and counteract the multidirectional forces applied to the tissue

10

Name 3 types of loose connective tissue

1) Mucous connective tissue (Wharton's jelly)

2) Adipose

3) Areolar

4) Reticular

11

Of what embryonic origin is connective tissue derived from?

Mesoderm

12

What is amorphous ground substance?

Gel-like matrix in which the fibres and cells are embedded in. The tissue fluids diffuse through. Composed of glycosaminoglycans, proteoglycans and glycoproteins

13

Where is mucous connective tissue ( Wharton's jelly) found?

Only found in the umbilical cord and subdermal connective tissue of the embryo

14

Where is areolar connective tissue found?

This is found:

- Deep under the skin

- In a layer beneath the epithelia of mucous membranes

- The submucosa

- Below the mesothelium of the peritoneum

- Associated with adventitia of blood vessels

- Surrounding the parenchyma of glands

15

What type of collagen is found in reticular fibres?

Type III

16

Where is dense irregular connective tissue found?

- Dermis of skin

- Deep fascia of muscles

- Periosteum

- Perichondrium

- Dura mater

17

Describe dense irregular connective tissue

Interwoven bundles of collagen, which criss-cross each other in many directions.

This counteracts multi-directional forces to which the tissues are subjected.

The tissue is mostly collagen with small components of elastic and reticular fibres

18

Describe systemic sclerosis

All organs have excessive accumulation of collagen (fibrosis). This occurs in skin, digestive tract, muscles and kidneys - hardening and functional impairment

19

Describe scurvy (Vitamin C deficiency)

Defective collagen synthesis leading to degeneration of connective tissue. Periodontal ligament (with a high collagen turnover) is affected in scurvy, lessening of teeth in their sockets with subsequent loss (bleeding gums)

20

Describe Marfan's syndrome

Genetic defect (autosomal dominant) in chromosomes that code for fibrillin, which affects elastic fibres (undeveloped). Large elastic arteries (Eg aorta) rupture because of high blood pressure

21

Describe Ehlers Danlos disease

Deficiency in collagen type III (reticular fibres) causing ruptures in tissues containing high reticulin content

22

What cells secrete cartilage matrix?

Chondroblasts

23

What is an entrapped chondroblasts termed?

Chondrocytes

24

What type of collagen makes up hyaline cartilage?

Type II

25

What type of collagen makes up elastic cartilage?

Type II

26

What type of collagen makes up fibrocartilage?

Type I

27

Where is hyaline cartilage located?

- Respiratory passageway

- Articulate surfaces (ends) of long bones

- Anterior ends of the ribs Flexible and smooth to allow movement of tissues

28

Where is elastic cartilage found?

- Auditory tubes

- External ear

- Epiglotis Provides support and maintains the shape of structures

29

Where is fibrocartilage found?

- Intervertebral disc

- Menisci

- Pubic symphysis

- Portions of the tendons Support and rigidity as it is the strongest cartilage

30

What is the clinical relevance of hyaline cartilage, particularly with age?

- Can calcify/ossify in old age and disease

- Increased size/number of chondrocytes with age