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Biology
Anatomy and Physiology
Histology
1. Introduction to Histology
2. Histological Techniques and Microscopy
3. The Cell: A Histological Perspective
4. The Four Basic Tissue Types
5. Histology of Organ Systems
Histology of Organ Systems
Cardiovascular System
The Heart
Wall Structure
Endocardium
Endothelial Lining
Subendothelial Layer
Subendocardial Layer
Myocardium
Cardiac Muscle Fibers
Intercalated Discs
Blood Supply
Epicardium
Mesothelium
Subepicardial Connective Tissue
Cardiac Skeleton
Fibrous Rings
Function
Heart Valves
Structure
Function
Cardiac Conduction System
Sinoatrial Node
Atrioventricular Node
Bundle of His
Purkinje Fibers
Blood Vessels
General Structure
Tunica Intima
Endothelium
Subendothelial Layer
Internal Elastic Lamina
Tunica Media
Smooth Muscle
Elastic Fibers
Tunica Adventitia
Connective Tissue
Vasa Vasorum
Nervi Vasorum
Arteries
Elastic Arteries
Structure
Function
Muscular Arteries
Structure
Function
Arterioles
Structure
Function
Regulation of Blood Flow
Capillaries
Continuous Capillaries
Structure
Locations
Function
Fenestrated Capillaries
Structure
Locations
Function
Sinusoidal Capillaries
Structure
Locations
Function
Capillary Beds
Blood-Tissue Exchange
Veins
Venules
Postcapillary Venules
Muscular Venules
Medium Veins
Structure
Valves
Large Veins
Structure
Lymphatic System
Lymphatic Vessels
Lymphatic Capillaries
Structure
Function
Collecting Lymphatic Vessels
Structure
Valves
Lymphatic Trunks and Ducts
Lymphoid Organs
Primary Lymphoid Organs
Bone Marrow
Structure
Hematopoiesis
Thymus
Cortex
Medulla
Hassall's Corpuscles
T-cell Development
Secondary Lymphoid Organs
Lymph Nodes
Structure
Capsule
Cortex
Paracortex
Medulla
Function
Spleen
White Pulp
Periarteriolar Lymphoid Sheaths
Lymphoid Follicles
Red Pulp
Splenic Cords
Splenic Sinusoids
Functions
Mucosa-Associated Lymphoid Tissue
Tonsils
Palatine Tonsils
Pharyngeal Tonsils
Lingual Tonsils
Peyer's Patches
Appendix
Integumentary System
Skin Structure
Epidermis
Layers
Stratum Basale
Structure
Function
Stratum Spinosum
Structure
Function
Stratum Granulosum
Structure
Function
Stratum Lucidum
Structure
Distribution
Stratum Corneum
Structure
Function
Cell Types
Keratinocytes
Structure
Function
Keratinization Process
Melanocytes
Structure
Function
Melanin Production
Langerhans Cells
Structure
Function
Merkel Cells
Structure
Function
Dermis
Papillary Layer
Structure
Dermal Papillae
Function
Reticular Layer
Structure
Collagen and Elastic Fibers
Function
Dermal Cells
Fibroblasts
Macrophages
Mast Cells
Hypodermis
Structure
Adipose Tissue
Function
Skin Appendages
Hair Follicles
Structure
Hair Shaft
Hair Root
Root Sheath
Hair Bulb
Dermal Papilla
Hair Growth Cycle
Anagen Phase
Catagen Phase
Telogen Phase
Types of Hair
Sebaceous Glands
Structure
Sebum Production
Function
Distribution
Sweat Glands
Eccrine Sweat Glands
Structure
Function
Distribution
Apocrine Sweat Glands
Structure
Function
Distribution
Nails
Structure
Nail Plate
Nail Bed
Nail Matrix
Cuticle
Growth
Function
Skin Functions
Protection
Thermoregulation
Sensation
Vitamin D Synthesis
Immune Function
Respiratory System
Conducting Portion
Nasal Cavity
Structure
Respiratory Epithelium
Pseudostratified Ciliated Columnar Epithelium
Goblet Cells
Basal Cells
Olfactory Epithelium
Olfactory Neurons
Supporting Cells
Basal Cells
Paranasal Sinuses
Structure
Lining Epithelium
Function
Pharynx
Nasopharynx
Oropharynx
Laryngopharynx
Larynx
Cartilaginous Framework
Vocal Folds
True Vocal Cords
False Vocal Cords
Epithelial Lining
Trachea
Structure
C-shaped Cartilage Rings
Trachealis Muscle
Mucosa
Pseudostratified Ciliated Epithelium
Goblet Cells
Submucosa
Seromucous Glands
Bronchi
Primary Bronchi
Secondary Bronchi
Tertiary Bronchi
Histological Changes
Cartilage Changes
Smooth Muscle Changes
Epithelial Changes
Bronchioles
Terminal Bronchioles
Structure
Clara Cells
Function
Respiratory Portion
Respiratory Bronchioles
Structure
Alveolar Outpocketings
Function
Alveolar Ducts
Structure
Function
Alveolar Sacs
Structure
Function
Alveoli
Structure
Cell Types
Type I Pneumocytes
Structure
Function
Type II Pneumocytes
Structure
Surfactant Production
Function
Alveolar Macrophages
Structure
Function
Blood-Air Barrier
Components
Function
Gas Exchange
Pleura
Visceral Pleura
Parietal Pleura
Pleural Cavity
Digestive System
General Organization
Wall Structure
Mucosa
Epithelium
Lamina Propria
Muscularis Mucosae
Submucosa
Connective Tissue
Submucosal Glands
Meissner's Plexus
Muscularis Externa
Inner Circular Layer
Outer Longitudinal Layer
Auerbach's Plexus
Serosa or Adventitia
Structure
Function
Oral Cavity
Oral Mucosa
Lining Mucosa
Structure
Locations
Masticatory Mucosa
Structure
Locations
Specialized Mucosa
Structure
Locations
Teeth
Structure
Enamel
Dentin
Pulp
Supporting Structures
Periodontal Ligament
Cementum
Alveolar Bone
Tongue
Muscle Organization
Intrinsic Muscles
Extrinsic Muscles
Mucosa
Dorsal Surface
Ventral Surface
Papillae
Filiform Papillae
Fungiform Papillae
Circumvallate Papillae
Foliate Papillae
Taste Buds
Structure
Cell Types
Function
Esophagus
Mucosa
Stratified Squamous Epithelium
Lamina Propria
Muscularis Mucosae
Submucosa
Esophageal Glands
Muscularis Externa
Upper Third
Middle Third
Lower Third
Adventitia
Stomach
Regions
Cardia
Fundus
Body
Antrum
Pylorus
Mucosa
Surface Epithelium
Gastric Pits
Gastric Glands
Fundic Glands
Parietal Cells
Chief Cells
Mucous Neck Cells
Enteroendocrine Cells
Cardiac Glands
Pyloric Glands
Submucosa
Muscularis Externa
Oblique Layer
Circular Layer
Longitudinal Layer
Serosa
Small Intestine
Surface Modifications
Plicae Circulares
Villi
Microvilli
Duodenum
Mucosa
Brunner's Glands
Ampulla of Vater
Jejunum
Structural Features
Functional Characteristics
Ileum
Structural Features
Peyer's Patches
Ileocecal Valve
Intestinal Epithelium
Enterocytes
Goblet Cells
Paneth Cells
Enteroendocrine Cells
Stem Cells
Intestinal Crypts
Structure
Function
Cell Renewal
Large Intestine
Regions
Cecum
Colon
Rectum
Anal Canal
Mucosa
Surface Epithelium
Crypts of Lieberkühn
Cell Types
Absorptive Cells
Goblet Cells
Enteroendocrine Cells
Muscularis Externa
Teniae Coli
Haustra
Anal Canal
Epithelial Transition
Anal Sphincters
Associated Digestive Glands
Salivary Glands
Major Salivary Glands
Parotid Gland
Structure
Serous Acini
Duct System
Submandibular Gland
Structure
Mixed Acini
Duct System
Sublingual Gland
Structure
Mucous Acini
Duct System
Minor Salivary Glands
Duct System
Intercalated Ducts
Striated Ducts
Excretory Ducts
Liver
Lobular Organization
Classic Hepatic Lobule
Portal Lobule
Hepatic Acinus
Hepatocytes
Structure
Functions
Protein Synthesis
Detoxification
Bile Production
Metabolism
Sinusoids
Structure
Kupffer Cells
Stellate Cells
Bile Canaliculi
Structure
Function
Portal Triad
Hepatic Artery
Portal Vein
Bile Duct
Central Vein
Gallbladder
Mucosa
Simple Columnar Epithelium
Lamina Propria
Muscularis
Serosa and Adventitia
Function
Pancreas
Exocrine Pancreas
Acinar Cells
Structure
Enzyme Production
Duct System
Intercalated Ducts
Intralobular Ducts
Interlobular Ducts
Main Pancreatic Duct
Endocrine Pancreas
Islets of Langerhans
Alpha Cells
Beta Cells
Delta Cells
PP Cells
Epsilon Cells
Urinary System
Kidney
Gross Structure
Cortex
Medulla
Renal Pyramids
Renal Columns
Renal Pelvis
The Nephron
Renal Corpuscle
Glomerulus
Capillary Structure
Mesangial Cells
Bowman's Capsule
Parietal Layer
Visceral Layer
Podocytes
Urinary Space
Filtration Barrier
Endothelium
Glomerular Basement Membrane
Podocyte Foot Processes
Tubular System
Proximal Convoluted Tubule
Structure
Function
Loop of Henle
Descending Limb
Thick Segment
Thin Segment
Ascending Limb
Thin Segment
Thick Segment
Distal Convoluted Tubule
Structure
Function
Collecting Duct System
Connecting Tubule
Cortical Collecting Duct
Medullary Collecting Duct
Principal Cells
Intercalated Cells
Juxtaglomerular Apparatus
Macula Densa
Juxtaglomerular Cells
Extraglomerular Mesangial Cells
Function
Renal Interstitium
Cortical Interstitium
Medullary Interstitium
Ureters
Mucosa
Transitional Epithelium
Lamina Propria
Muscularis
Inner Longitudinal Layer
Outer Circular Layer
Adventitia
Bladder
Mucosa
Transitional Epithelium
Lamina Propria
Muscularis
Detrusor Muscle
Serosa and Adventitia
Urethra
Male Urethra
Prostatic Urethra
Membranous Urethra
Penile Urethra
Female Urethra
Structure
Epithelium
Endocrine System
General Principles
Hormone Classification
Hormone Action
Feedback Mechanisms
Pituitary Gland
Anterior Pituitary
Cell Types
Somatotrophs
Lactotrophs
Corticotrophs
Thyrotrophs
Gonadotrophs
Chromophils and Chromophobes
Hypothalamic Control
Posterior Pituitary
Structure
Pituicytes
Nerve Fibers
Hormone Storage and Release
Thyroid Gland
Follicular Structure
Follicular Cells
Colloid
Thyroglobulin
Parafollicular Cells
Structure
Function
Hormone Synthesis and Release
Parathyroid Glands
Chief Cells
Structure
Function
Oxyphil Cells
Structure
Function
Hormone Regulation
Adrenal Glands
Adrenal Cortex
Zona Glomerulosa
Structure
Mineralocorticoid Production
Zona Fasciculata
Structure
Glucocorticoid Production
Zona Reticularis
Structure
Androgen Production
Adrenal Medulla
Chromaffin Cells
Structure
Catecholamine Production
Innervation
Pineal Gland
Pinealocytes
Structure
Function
Glial Cells
Corpora Arenacea
Melatonin Production
Endocrine Pancreas
Islet Structure
Cell Types
Alpha Cells
Structure
Glucagon Production
Beta Cells
Structure
Insulin Production
Delta Cells
Structure
Somatostatin Production
PP Cells
Structure
Pancreatic Polypeptide Production
Male Reproductive System
Testis
Structure
Tunica Albuginea
Seminiferous Tubules
Interstitial Tissue
Seminiferous Tubules
Spermatogenic Cells
Spermatogonia
Primary Spermatocytes
Secondary Spermatocytes
Spermatids
Spermatozoa
Sertoli Cells
Structure
Functions
Support
Nutrition
Phagocytosis
Hormone Production
Blood-Testis Barrier
Interstitial Tissue
Leydig Cells
Structure
Testosterone Production
Blood Vessels
Lymphatics
Spermatogenesis
Mitotic Phase
Meiotic Phase
Differentiation Phase
Duration and Regulation
Genital Ducts
Straight Tubules
Rete Testis
Efferent Ductules
Structure
Function
Epididymis
Structure
Head
Body
Tail
Epithelium
Functions
Sperm Maturation
Sperm Storage
Ductus Deferens
Structure
Epithelium
Muscularis
Function
Accessory Glands
Seminal Vesicles
Structure
Secretory Product
Function
Prostate Gland
Zones
Peripheral Zone
Central Zone
Transition Zone
Glandular Structure
Prostatic Secretions
Stroma
Bulbourethral Glands
Structure
Secretion
Function
Penis
Erectile Tissue
Corpora Cavernosa
Corpus Spongiosum
Penile Urethra
Skin and Fascia
Female Reproductive System
Ovary
Structure
Cortex
Medulla
Tunica Albuginea
Ovarian Follicles
Primordial Follicles
Structure
Oocyte
Follicular Cells
Primary Follicles
Unilaminar Primary Follicles
Multilaminar Primary Follicles
Zona Pellucida
Secondary Follicles
Antrum Formation
Granulosa Cells
Theca Layers
Graafian Follicles
Structure
Cumulus Oophorus
Corona Radiata
Corpus Luteum
Formation
Structure
Granulosa Lutein Cells
Theca Lutein Cells
Function
Regression
Corpus Albicans
Formation
Structure
Atretic Follicles
Oogenesis
Mitotic Phase
Growth Phase
Maturation Phase
Uterine Tubes
Regions
Infundibulum
Ampulla
Isthmus
Intramural Part
Wall Structure
Mucosa
Ciliated Cells
Secretory Cells
Muscularis
Serosa
Function
Uterus
Regions
Fundus
Body
Cervix
Wall Structure
Endometrium
Stratum Functionalis
Stratum Basalis
Glands
Stroma
Myometrium
Muscle Layers
Perimetrium
Menstrual Cycle
Proliferative Phase
Secretory Phase
Menstrual Phase
Cervix
Structure
Endocervix
Ectocervix
Epithelium
Columnar Epithelium
Squamous Epithelium
Transformation Zone
Cervical Glands
Vagina
Wall Structure
Mucosa
Stratified Squamous Epithelium
Lamina Propria
Muscularis
Adventitia
Hormonal Effects
External Genitalia
Structure
Histological Features
Placenta
Development
Structure
Chorionic Villi
Intervillous Space
Decidua
Maternal-Fetal Interface
Functions
Gas Exchange
Nutrient Transfer
Hormone Production
Mammary Glands
Structure
Nipple
Areola
Ductal System
Lobular Structure
Development
Prepubertal
Pubertal
Adult
Pregnancy and Lactation
Hormonal Changes
Structural Changes
Milk Production
Special Senses
The Eye
Fibrous Tunic
Sclera
Structure
Function
Cornea
Layers
Corneal Epithelium
Bowman's Layer
Stroma
Descemet's Membrane
Corneal Endothelium
Function
Vascular Tunic
Choroid
Structure
Function
Ciliary Body
Structure
Function
Iris
Structure
Function
Neural Tunic
Retina
Layers
Pigment Epithelium
Photoreceptor Layer
Outer Nuclear Layer
Outer Plexiform Layer
Inner Nuclear Layer
Inner Plexiform Layer
Ganglion Cell Layer
Nerve Fiber Layer
Internal Limiting Membrane
Photoreceptors
Rods
Cones
Supporting Cells
Müller Cells
Specialized Regions
Fovea
Optic Disc
Lens
Structure
Lens Fibers
Lens Capsule
Function
Vitreous Body
Accessory Structures
Eyelids
Conjunctiva
Lacrimal Apparatus
The Ear
External Ear
Auricle
Structure
Cartilage
External Auditory Canal
Structure
Ceruminous Glands
Middle Ear
Tympanic Membrane
Structure
Function
Tympanic Cavity
Auditory Ossicles
Malleus
Incus
Stapes
Eustachian Tube
Inner Ear
Bony Labyrinth
Membranous Labyrinth
Cochlea
Structure
Organ of Corti
Hair Cells
Supporting Cells
Tectorial Membrane
Function
Vestibular System
Semicircular Canals
Structure
Cristae Ampullares
Otolith Organs
Utricle
Saccule
Maculae
Function
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4. The Four Basic Tissue Types
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1. Introduction to Histology