Today - Histology

• 1 handout today

• Quiz #1 available today at 3pm until Monday at 11pm

• Quiz #1 available Friday 3pm until Monday at 11pm

• 10 minutes, 5 questions• 1 question = 1 point• you can only take it once• don’t open it until you are ready to take it!• be sure to hit submit when you are finished• submit before time runs out• open book but not a group effort!

Cells + matrix = tissues

1. Epithelial tissue2. Connective tissue3. Muscle tissue4. Nervous tissue

Epithelial tissue

Connective tissue

simple

stratified

squamous

cuboidal

columnar

Pseudostratified columnar

ciliated

Goblet cells

Stratified squamous

Transitional (stratified)

1. esophagus

2. stomach

3. Small intestine

4. Large intestine

5. rectum

Simple or stratified

• Squamous• Cuboidal• Columnar• Pseudocolumnar• Glands?

1. Esophagus: food passageway

2. Stomach: mechanical & chemical breakdown of food

3. Small Intestine: absorption & secretion

4. Large intestine: some absorption

5. Rectum: passageway for waste

Connective Tissue

General Functions:

1. Binds organs2. Support3. Protection4. Immune protection5. Movement6. Storage7. Heat8. Others…..

Three types• Fibrous• Supportive• Fluid

Cells + fibers + ground substance = connective tissue

Cells = fibroblasts

Fibers = elastin & collagen

Cells = fibroblasts

Fibers = collagen & elastin

Change composition = change function

Reticular fibers

loose dense

mesentery

Areolar tissue

Tendons & ligaments

skin

regular

irregular

Fibrous connective tissue type and function

Supportive connective tissue = cartilage & bone

Cells: chondrocytes

Fibers: collagen & elastin

GS: GAG’s

Perichondrium: dense, irregular CT with chondroblasts

hyaline elastic

fibrocartilage

• chondrocytes• collagen & elastin fibers• GAG’s

Cells: osteocytes

Fibers: collagen

Matrix: GAG’s & minerals

Bone

Central canal = blood vessel

Surrounded by periosteum

Nervous tissue

Muscle tissue

• neurons & glia• electrical & chemical signals

• muscle fibers• contract when stimulated• skeletal, smooth & cardiac

Glands = cell or organ that secretes something

Exocrine glands

Endocrine glands

• secrete stuff to surface• body surface or organ• sweat, tear, mammary, goblet cell

• secrete stuff into blood• stuff = hormones

Mucous membrane

Membranes line & cover viscera

• cutaneous• mucous • serous

DifferentiationMetaplasia

** don’t forget about quiz #1!Available until Monday at 11pm