Week 2 3 Histology The study of the
- Slides: 36
Week 2 -3 Histology The study of the tissues of the body
What is a tissue? • Two or more cells that share a common – Structure – Function • Secretion • Protection – Embryological origin
Tissues in perspective:
There are four tissue categories: Epithelial Tissue Muscle Tissue Connective Tissue Nerve Tissue Histology is the study of tissues.
Objective 1: Epithelial Tissues • Location – Covers body surfaces – Lines internal cavities • Functions – Diffusion, secretion, absorption, filtration, protection Note: the singular form is epithelium; plural form epithelia
Classification of epithelium By cell shape By number of layers One layer = Simple More then one layer = Stratified
Putting it all together: To classify an epithelium state the number of layers then cell shape.
Some specializations: Cilia Microvilli
Simple Epithelia Simple squamous Simple cuboidal Look for a flattened nucleus Look for a rounded nucleus Simple columnar Look for an oval nucleus
Stratified Epithelia Named according to the shape of the apical layer of cells Stratified cuboidal Stratified squamous Stratified columnar
More Epithelia Pseudostratified Transitional
Identify the Epithelial Tissue
Identify the Epithelial Tissue
Identify the Epithelial Tissue
Objective 2: Tissue • Locations – Most abundant tissue, found everywhere – Except for body surfaces What type of tissue is found on body surfaces? • Functions – Binding and support, protection, insulation, transportation Connective
Connective tissue has cells, fibers, and ground substance. Cell types • Fibroblasts (cytes)*- secrete /maintain ground substance • Chondroblasts (cytes)*- secrete /maintain ground substance • Mast cells – secrete histamine, heparin • Macrophages – phagocytes • Adipocytes – fat storage * Blasts secrete ground substance; cytes maintain ground substance
Cells Note: Unlike epithelial tissue, connective tissue is relatively cell poor Fibroblast Adipocytes Mast cells Macrophage
Ground substance • Interstitial fluid • Proteoglycans Fibers • Collagen fibers • Elastic fibers • Reticular fibers
Areolar Connective Tissue (AKA Loose connective tissue) The prototype of connective tissues. Other connective tissues contain variations in the amount or type of cells, ground substance or fibers found in areolar connective tissue
Classes of Connective Tissue
Mesenchyme: tisssue embryologic connective ground substance cells fibers
Connective Tissues Proper Areolar connective tissue cells collagen fibers reticular fibers ground substance
Connective Tissue Proper Adipose tissue adipocytes adipocyte nucleus
Wouldn’t you know it. . .
Connective Tissue Proper Dense regular fibrocyte collagen fibers
Connective Tissue Proper Dense Irregular collagen fibers
Connective Tissue Proper Reticular tissue mast cell reticular fibers
Hyaline Cartilage matrix lacuna chondrocytes
Elastic Cartilage elastic fibers chondrocyte in a lacuna
Fibrocartilage collagen fibers chondrocytes in lacuna
Objective 3: Membranes are simple organs composed of two tissues: • epithelium • connective tissue Serous Membrane simple squamous epithelium areolar connective tissue (lamina propria) Mucous Membrane stratified squamous or simple columnar epithelium areolar connective tissue (lamina propria)
Serous Membrane Identify the epithelium Lamina propria
Mucous Membrane Esophagus Trachea ? a pri ro ? La m p ina Lamina propria
Questions to ask while identifying tissues Tissue Closely packed cells little or no intercellular material Cells separated by intercellular material Epithelial tissue Connective tissue
Epithelial tissue Cells flat scale like? Simple squamous One layer of cells? Many layers of cells? Simple epithelium Stratified epithelium Cells cubical? Apical layer retangular flat and Round Oval nuclei? scale like? nucleus? Stratified Simple squamous cuboidal columnar Apical cells cuboidal? Stratified cuboidal Apical cells rectangular? Stratified columnar Apical cells rounded, scalloped? Transitional
Use similar reasoning to classify connective tissues! Try it yourself What questions do you need to ask and in what order?
- Week by week plans for documenting children's development
- Tissue type
- What is case series
- Retrospective cohort study vs prospective cohort study
- What is work study in management
- Study less study smart
- Study to study
- Differentiate between time study and motion study
- Difference between time study and motion study
- Hình ảnh bộ gõ cơ thể búng tay
- Frameset trong html5
- Bổ thể
- Tỉ lệ cơ thể trẻ em
- Voi kéo gỗ như thế nào
- Tư thế worms-breton
- Chúa yêu trần thế
- Môn thể thao bắt đầu bằng từ chạy
- Thế nào là hệ số cao nhất
- Các châu lục và đại dương trên thế giới
- Công thức tính thế năng
- Trời xanh đây là của chúng ta thể thơ
- Cách giải mật thư tọa độ
- 101012 bằng
- Phản ứng thế ankan
- Các châu lục và đại dương trên thế giới
- Thơ thất ngôn tứ tuyệt đường luật
- Quá trình desamine hóa có thể tạo ra
- Một số thể thơ truyền thống
- Cái miệng xinh xinh thế chỉ nói điều hay thôi
- Vẽ hình chiếu vuông góc của vật thể sau
- Biện pháp chống mỏi cơ
- đặc điểm cơ thể của người tối cổ
- Thế nào là giọng cùng tên? *
- Vẽ hình chiếu đứng bằng cạnh của vật thể
- Fecboak
- Thẻ vin
- đại từ thay thế