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Simple Squamous Epithelium
Simple Cuboidal Epithelium
Simple Columnar Epithelium
Pseudostratified Columnar Epithelium
Stratified Squamous Epithelium
Stratified Cuboidal Epithelium
Stratified Columnar Epithelium
Transitional Epithelium
Glandular Epithelium
Connective Tissues – Embryonic/Fetal
Connective Tissues – Adult
Connective Tissues – Supporting
Connective Tissues – Transport
Muscles Tissues
Nervous Tissues

Organ Systems

Integumentary System
Cardiovascular System
Lymphatic System

Digestive System Part I – Oral Cavity and Salivary Glands

Digestive System  Part II – Esophagus and GI Tract

Digestive System  Part III – Liver, Gall Bladder and Pancreas

Respiratory System
Urinary System
Endocrine System
Reproductive System

Sensory System:  The Eye And Internal Ear


Integumentary System

Thick Skin Palm 100X

The image shows the epidermis and dermis of thick skin of the palm, at a higher magnification.  The clear stratum lucidum, with its few rows of dead keratinocytes (white arrow), lies superficially to the stratum granulosum.  The darkly stained keratinocytes of the stratum granulosum (green arrow) contain keratohyalin granules and lamellar bodies.  Keratohyalin granules promote the formation and aggregation of keratin filaments, which become incorporated into the plasma membrane of the cells.  As the cells leave the stratum granulosum and enter the stratum corneum, they undergo apoptosis and become cornified (keratinized) within a few hours.  The lamellar bodies (lamellated granules) of keratinocytes waterproof the epidermis by depositing insoluble proteins on the inner surface of plasma membranes.  They also secrete glycolipids into the intercellular spaces between the stratum granulosum and the stratum corneum.  A yellow arrow identifies the thickest layer of stratified squamous cells of the epidermis, the stratum spinosum.  The red asterisk identifies a dermal papilla, containing loose connective tissue, projecting into the  epidermis from the dermis.

Scalp Hair Follicles-Sebaceous Glands 40X

The light micrograph shows hair follicles in different stages of activity (red arrows) and sebaceous glands (magenta arrows) surrounded by connective tissue.  A hair shaft can be seen in the upper left quadrant of the figure.  Observe the beginnings of a hair shaft in the follicle to the far right in the image.  Hair follicles and sebaceous glands are modifications of epidermal epithelium and are considered skin appendages.

Scalp Hair Follicle+Root100X

The photomicrograph shows a hair of the scalp near the root area.  Each hair consists of a free hair shaft and a root that is embedded in a hair follicle (Hf).  The follicle is surrounded by stratified squamous cells of the epidermis (green arrow).  Observe the damage to the follicle to the left of the shaft.  This occurred when the tissue was sectioned.  Note, also, that the base of the follicle has not expanded to form the typically-shaped hair bulb (Hb).

Skin Eccrine Sweat Glands 40X

At low magnification, eccrine sweat glands are visible at the interface between the dermis (D) and hypodermis (H) of the skin.  Sudoriferous or sweat glands are independent skin appendages that arise from the fetal epidermis.  Sweat glands are the most numerous glands in the body.

Thick Skin   Palm   40X
Thick Skin   Palm   400X
Thin Skin   100X
Thin Skin   400X
Thin Skin  Melanocytes  400X
Hair Bulb   Scalp   40X
Eyelash   40X
Sebaceous Glands   Scalp   400X
Eccrine/Merocrine Sweat Glands   100X
Skin   Vater-Pacini Corpuscles   100X