5: Histology

Integrated Human Anatomy and Physiology Lab Manual I: Fundamentals of Structure and Movement · LibreTexts

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    From LibreTexts, under CC BY-NC 4.0, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.

    Introduction

    In this lab, we will explore the microscopic structure of tissues through histological examination. Histology is the science that provides the adequate learning of the tissue organization of the body, and is a fundamental part of medical/health education. Tissues are made from large groups of cells that cluster together to complete a shared function. From tissues arise organs, and organs keep the body operating.

    “One must understand the normal to be able to recognize the abnormal” is a common phrase in healthcare. Many diseases occur at the cell/tissue level. Cytology is the examination of a single cell type. It is mainly used to diagnose or screen for cancer (pap smear for cancer of cervix). Histology bridges anatomy and physiology, helping us understand how microscopic structures support bodily functions. Histopathology is the examination of tissues in order to observe the appearance of diseased cells in microscopic detail. Histopathology typically involves a biopsy, which is a procedure involving taking a small sample of tissue, usually undertaken by a pathologist, who are experts in diagnoses of diseases. Hospital laboratories prepare microscope sections which are stained to show key features of the cells and anatomical structures within the tissues. Understanding the changes that are characteristic of a disease requires a detailed knowledge of the normal appearance of cells and tissues, and the range of normality. By using light microscopes and prepared histological slides, we will analyze the structural characteristics of the four primary tissue types:

    • Epithelial Tissue – Covers body surfaces, lines cavities, and forms glands.
    • Connective Tissue – Provides structural support, protection, and transport of substances.
    • Muscle Tissue – Facilitates movement through contraction.
    • Nervous Tissue – Enables communication and coordination within the body.
    Learning Objectives
    • Identify diverse types of epithelial tissue from an image or histology slide and relate location and function.
    • Explain the structural modifications such as cilia, microvilli, or keratinization that contribute to the specific function of each epithelial tissue sub-type, if applicable.
    • Identify several types of connective tissue from an image or histology slide and relate location and function.
    • Identify the ground substance and the diverse types of protein fibers that create the extracellular matrix on an image or histology slide of connective tissue.
    • Identify the most common type(s) of cells present in a picture or histology slide of connective tissue.
    • Differentiate the three types of cartilage.
    • Locate and Identify the three distinct types of muscle tissue from an image or histology slide and relate location and function.
    • Describe the function and common locations of the three diverse types of muscle tissue.
    • Identify nervous tissue in an image or histology slide.

    • 5.1: Terminology Checklist
      This page offers a comprehensive terminology checklist for different tissue types in a lab context. It categorizes epithelial, connective, muscle, and nervous tissues, detailing key characteristics such as surface structures for epithelial tissues, matrix and cell types for connective tissues, the distinct features of skeletal, cardiac, and smooth muscle, and fundamental terms related to neurons and neuroglial cells in nervous tissue.
    • 5.2: Warm-Up Activity
      This page discusses a pulmonologist's role in treating a patient with a persistent cough, focusing on respiratory conditions amid the COVID-19 pandemic. It underscores the significance of histopathologic lung tissue examination to comprehend disease mechanisms and explore new treatment strategies for COVID-19 and future outbreaks.
    • 5.3: Background Information
      This page discusses epithelial tissue types, highlighting six main forms: simple squamous, cuboidal, columnar, ciliated pseudostratified columnar, keratinized and non-keratinized stratified squamous, and transitional epithelium. Each type serves protective functions, featuring characteristics like polarity and projections.
    • 5.4: Lab 5 - Procedure
      This page provides a guide on using a microscope to examine epithelial tissue on prepared slides. It explains the setup process, adjustment of stage and focus, and use of various magnifications. Readers are instructed to identify and illustrate six epithelial tissue types, highlighting key cellular components. The page stresses the importance of surveying slides for representative tissue sections to enhance understanding.
    • 5.5: Activity 1
      This page provides a comprehensive guide on identifying various epithelial tissues using microscopy, including Simple Squamous, Cuboidal, Columnar, Ciliated Pseudostratified, Stratified Squamous, and Transitional Epithelium. Students are instructed to observe slides, highlight cell features, and document findings through drawings and tables that outline identification features, locations, and functions.
    • 5.6: Activity 2
      This page discusses the classification and characteristics of connective tissues, highlighting their variation from blood to bone, with fibroblasts as the main cell type producing the extracellular matrix. It categorizes connective tissues into loose, dense, supportive, and fluid types, explaining their structures and functions.
    • 5.7: Activity 3
      This page covers supportive connective tissues like compact bone and various types of cartilage, explaining their unique cell types, fiber types, and matrix compositions. It also details a laboratory exercise for examining a blood smear, where students observe and document blood components and fibrocartilage characteristics under different magnifications. The importance of structured documentation and accessibility through printed materials is emphasized for effective participation.
    • 5.8: Activity 4
      This page discusses the three types of muscle tissue: skeletal, cardiac, and smooth muscle, each with distinct characteristics. Skeletal muscle is striated and multinucleated, allowing voluntary movement. Cardiac muscle, located in the heart, has intercalated discs and striations for synchronized contractions. Smooth muscle contains a single nucleus, lacks striations, and facilitates involuntary movements in internal organs.
    • 5.9: Glossary
      This page offers definitions and descriptions of various cell and tissue types in the human body, including adipocytes, agranulocytes, and chondrocytes. It explores structural characteristics of cells like biconcave erythrocytes, connective tissue components such as collagen and elastic fibers, and distinctions between muscle types.

    Thumbnail: The intricate architecture of compact bone reveals nature’s blueprint for strength and resilience. (CC BY-SA 4.0; via Examining Connective Tissue).

    This page titled 5: Histology was last modified on Tue, 01 Sep 2026 01:45:29 GMT and is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Lakshmikanta Sengupta and Susmita Sengupta.