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Exercise 6 Tissues. Organization of Tissues Types There are four major tissue types: 1.Epithelium 2.Connective 3.Muscle 4.Nervous.

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Presentation on theme: "Exercise 6 Tissues. Organization of Tissues Types There are four major tissue types: 1.Epithelium 2.Connective 3.Muscle 4.Nervous."— Presentation transcript:

1 Exercise 6 Tissues

2 Organization of Tissues Types There are four major tissue types: 1.Epithelium 2.Connective 3.Muscle 4.Nervous

3 Characteristics of Epithelial tissue High cellularity - lots of densely packed cells with … Specialized intercellular contacts - such as tight junctions, desmosomes and gap junctions. Basement membranes & other c.t. support - anchors to connective tissue. Polarity - it has an apical side and a basal side (a free edge and a fixed edge). Avascular - no blood supply. Receive oxygen and nutrients by diffusion Highly mitotic - cells readily regenerate.

4 Subcategories of epithelial tissue i.Simple 1.squamous 2.cuboidal 3.columnar ii.Stratified 1.squamous 2.cuboidal 3.columnar iii.Special (doesn’t fall neatly into either of the above) 1.Pseudostratified columnar 2.Transitional

5 Simple Squamous Top view Nucleus

6 Simple Cuboidal Nuclei

7 Simple Columnar Basement membrane Goblet cells

8 Pseudostratified columnar a.

9 Pseudostratified columnar b. Cilia

10 Stratified squamous

11 Keratinizing Stratified Squamous Keratin layer of dead cells

12 Stratified Cuboidal

13 Stratified Columnar Rare, found in the male urethra and few other places.

14 Transitional Found only in the urinary tract

15 Characteristics of Connective Tissue Common developmental origin - it is all from mesoderm Mostly well vascularized (except cartilages, tendons and ligaments) Low cellularity - the general arrangement is a variable (often scant) number of cells in a non-living matrix. The matrix: fibers of protein (collagen, elastic & reticular) ground substance (proteoglycans, cell adhesion molecules & interstial fluid

16 Connective tissue

17 Subcategories of Connective tissue i.Embryonic 1.Mesenchyme ii.Connective tissue proper 1.Loose a.Areolar b.Adipose c.Reticular 2.Dense a.Irregular (elastic or yellow) b.Regular (white fibrous) 3.Cartilage a.Hyaline b.Elastic c.Fibrocartilage 4.Bone (osseous) 5.Blood

18 Mesenchyme

19 Embryonic mesenchyme

20 Loose c.t.: areolar

21 Loose c.t.: reticular

22 Loose c.t.: adipose

23 Dense irregular c.t.

24 More dense irregular c.t.

25 Dense regular c.t.

26 Dense regular c.t.: tendon

27 Hyaline Cartilage

28 Elastic Cartilage

29

30 Bone: compact

31 Bone

32 Blood

33 Skeletal muscle l.sc.s.

34 Smooth muscle

35 Cardiac muscle

36 Nervous tissue

37

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