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Histology Slides Identification: Exam Preparation Guide for MBBS
Histology slide identification is one of the fastest ways to score in the 1st Year MBBS Anatomy practical, and also one of the easiest places to lose marks through confusion between look-alike slides. This guide gives you the identifying points for every core slide, a method for identifying any slide under pressure, and the questions examiners usually ask.
SME-reviewed. Updated 2026.
Revise histology with the GeckoMed appQuick Facts: Histology in the Anatomy Practical
| Detail | Information |
|---|---|
| Subject | Anatomy |
| MBBS phase | Phase 1 (1st Year) |
| Where tested | Anatomy practical (slide spotters or OSPE), viva and practical record |
| Routine stain | Haematoxylin and eosin (H&E): nuclei stain blue-purple, cytoplasm and collagen stain pink |
| What you are expected to do | Name the slide, give two or three identifying features, draw a labelled diagram |
| Marks and time per slide | Set by your university and college |
Detail
MBBS phase
Information
Phase 1 (1st Year)
Detail
Where tested
Information
Anatomy practical (slide spotters or OSPE), viva and practical record
Detail
Routine stain
Information
Haematoxylin and eosin (H&E): nuclei stain blue-purple, cytoplasm and collagen stain pink
Detail
What you are expected to do
Information
Name the slide, give two or three identifying features, draw a labelled diagram
Detail
Marks and time per slide
Information
Set by your university and college
What to Expect in the Histology Practical
| Component | What You Do | What Examiners Check |
|---|---|---|
| Slide spotters | Identify a slide under a fixed microscope within a set time | Correct name and two or three identifying points |
| Diagram | Draw and label the slide | Accuracy, neat labels, correct proportions |
| Viva | Answer questions on the slide | Epithelium type, special cells, function, applied points |
| Practical record | Submit labelled histology diagrams | Completeness and neatness |
Component
Slide spotters
What You Do
Identify a slide under a fixed microscope within a set time
What Examiners Check
Correct name and two or three identifying points
Component
Diagram
What You Do
Draw and label the slide
What Examiners Check
Accuracy, neat labels, correct proportions
Component
Viva
What You Do
Answer questions on the slide
What Examiners Check
Epithelium type, special cells, function, applied points
Component
Practical record
What You Do
Submit labelled histology diagrams
What Examiners Check
Completeness and neatness
Callout: Always start at low power. Most slides are identified by their overall architecture at low power; high power only confirms your answer.
Step-by-Step Method to Identify Any Slide
- Look with the naked eye. Note the shape, size and whether it is hollow (tube or organ with a lumen) or solid.
- Scan at low power. Identify layers, lobules, follicles or a lumen.
- Identify the lining epithelium if there is a surface or lumen.
- Look for the special feature that makes the slide unique, such as Brunner's glands or Hassall's corpuscles.
- Confirm at high power by checking cell types.
- Compare with look-alikes before giving your final answer.
Identifying Points: General Histology
| Slide | Key Identifying Features |
|---|---|
| Simple squamous epithelium | Single layer of flat cells with flattened nuclei (for example lining of blood vessels and alveoli) |
| Simple cuboidal epithelium | Single layer of cube-shaped cells with round central nuclei (for example thyroid follicles, kidney tubules) |
| Simple columnar epithelium | Tall cells with basal nuclei; goblet cells in the intestine |
| Pseudostratified ciliated columnar epithelium | Nuclei at different levels, all cells resting on the basement membrane, cilia and goblet cells (for example trachea) |
| Stratified squamous keratinised epithelium | Many layers with a surface layer of keratin (for example skin) |
| Stratified squamous non-keratinised epithelium | Many layers, no keratin (for example oesophagus, vagina) |
| Transitional epithelium | Several layers with large dome-shaped surface cells (for example urinary bladder) |
| Hyaline cartilage | Homogeneous matrix, chondrocytes in lacunae forming isogenous groups, perichondrium |
| Elastic cartilage | Chondrocytes with a network of elastic fibres in the matrix, perichondrium (for example pinna, epiglottis) |
| Fibrocartilage | Rows of chondrocytes between thick bundles of collagen fibres, no perichondrium (for example intervertebral disc) |
| Compact bone (ground section) | Haversian systems with concentric lamellae around a central canal, lacunae and canaliculi, Volkmann's canals |
| Skeletal muscle | Long cylindrical fibres, cross-striations, many peripheral nuclei |
| Cardiac muscle | Branching fibres, striations, central nuclei, intercalated discs |
| Smooth muscle | Spindle-shaped cells, single central nucleus, no striations |
| Peripheral nerve | Nerve fibres in bundles surrounded by perineurium, whole nerve covered by epineurium |
| Large elastic artery | Thick tunica media with many elastic lamellae (for example aorta) |
| Medium-sized (muscular) artery | Prominent internal elastic lamina, thick smooth muscle media, round lumen |
| Medium-sized vein | Thin wall, large irregular lumen, thick adventitia, poorly defined layers |
Slide
Simple squamous epithelium
Key Identifying Features
Single layer of flat cells with flattened nuclei (for example lining of blood vessels and alveoli)
Slide
Simple cuboidal epithelium
Key Identifying Features
Single layer of cube-shaped cells with round central nuclei (for example thyroid follicles, kidney tubules)
Slide
Simple columnar epithelium
Key Identifying Features
Tall cells with basal nuclei; goblet cells in the intestine
Slide
Pseudostratified ciliated columnar epithelium
Key Identifying Features
Nuclei at different levels, all cells resting on the basement membrane, cilia and goblet cells (for example trachea)
Slide
Stratified squamous keratinised epithelium
Key Identifying Features
Many layers with a surface layer of keratin (for example skin)
Slide
Stratified squamous non-keratinised epithelium
Key Identifying Features
Many layers, no keratin (for example oesophagus, vagina)
Slide
Transitional epithelium
Key Identifying Features
Several layers with large dome-shaped surface cells (for example urinary bladder)
Slide
Hyaline cartilage
Key Identifying Features
Homogeneous matrix, chondrocytes in lacunae forming isogenous groups, perichondrium
Slide
Elastic cartilage
Key Identifying Features
Chondrocytes with a network of elastic fibres in the matrix, perichondrium (for example pinna, epiglottis)
Slide
Fibrocartilage
Key Identifying Features
Rows of chondrocytes between thick bundles of collagen fibres, no perichondrium (for example intervertebral disc)
Slide
Compact bone (ground section)
Key Identifying Features
Haversian systems with concentric lamellae around a central canal, lacunae and canaliculi, Volkmann's canals
Slide
Skeletal muscle
Key Identifying Features
Long cylindrical fibres, cross-striations, many peripheral nuclei
Slide
Cardiac muscle
Key Identifying Features
Branching fibres, striations, central nuclei, intercalated discs
Slide
Smooth muscle
Key Identifying Features
Spindle-shaped cells, single central nucleus, no striations
Slide
Peripheral nerve
Key Identifying Features
Nerve fibres in bundles surrounded by perineurium, whole nerve covered by epineurium
Slide
Large elastic artery
Key Identifying Features
Thick tunica media with many elastic lamellae (for example aorta)
Slide
Medium-sized (muscular) artery
Key Identifying Features
Prominent internal elastic lamina, thick smooth muscle media, round lumen
Slide
Medium-sized vein
Key Identifying Features
Thin wall, large irregular lumen, thick adventitia, poorly defined layers
Identifying Points: Lymphoid Organs and Skin
| Slide | Key Identifying Features |
|---|---|
| Lymph node | Capsule, subcapsular sinus, outer cortex with lymphoid follicles and germinal centres, medulla with cords and sinuses |
| Spleen | Capsule with trabeculae, scattered white pulp (lymphoid follicles) each with an eccentric central arteriole, red pulp filling the rest |
| Thymus | Lobules with dark cortex and pale medulla, Hassall's corpuscles in the medulla, no lymphoid follicles |
| Palatine tonsil | Stratified squamous non-keratinised epithelium dipping into crypts, lymphoid follicles below |
| Thick skin | Very thick stratum corneum, stratum lucidum present, sweat glands, no hair follicles (palm and sole) |
| Thin skin | Thin epidermis, hair follicles and sebaceous glands present |
Slide
Lymph node
Key Identifying Features
Capsule, subcapsular sinus, outer cortex with lymphoid follicles and germinal centres, medulla with cords and sinuses
Slide
Spleen
Key Identifying Features
Capsule with trabeculae, scattered white pulp (lymphoid follicles) each with an eccentric central arteriole, red pulp filling the rest
Slide
Thymus
Key Identifying Features
Lobules with dark cortex and pale medulla, Hassall's corpuscles in the medulla, no lymphoid follicles
Slide
Palatine tonsil
Key Identifying Features
Stratified squamous non-keratinised epithelium dipping into crypts, lymphoid follicles below
Slide
Thick skin
Key Identifying Features
Very thick stratum corneum, stratum lucidum present, sweat glands, no hair follicles (palm and sole)
Slide
Thin skin
Key Identifying Features
Thin epidermis, hair follicles and sebaceous glands present
Identifying Points: Digestive System
| Slide | Key Identifying Features |
|---|---|
| Tongue | Stratified squamous epithelium with papillae, skeletal muscle fibres running in different directions |
| Oesophagus | Stratified squamous non-keratinised epithelium, oesophageal glands in submucosa; muscle type varies along its length |
| Stomach (fundus) | Short gastric pits, long straight gastric glands with pink parietal cells and basophilic chief cells |
| Duodenum | Villi with Brunner's glands in the submucosa |
| Jejunum | Tall villi and prominent circular folds, no Brunner's glands, no Peyer's patches |
| Ileum | Villi with Peyer's patches (aggregated lymphoid follicles) |
| Large intestine (colon) | No villi, straight crypts with many goblet cells |
| Appendix | Small, often irregular lumen, abundant lymphoid follicles in the mucosa and submucosa, no villi |
| Liver | Lobules with a central vein, cords of hepatocytes, sinusoids and portal triads at the periphery |
| Pancreas | Serous acini with pale-staining islets of Langerhans |
| Gall bladder | Tall columnar epithelium thrown into folds, no muscularis mucosae or submucosa |
| Parotid gland | Purely serous acini, prominent ducts and fat cells |
| Submandibular gland | Mixed gland, mainly serous acini with some mucous acini and serous demilunes |
| Sublingual gland | Mixed gland, mainly mucous acini |
Slide
Tongue
Key Identifying Features
Stratified squamous epithelium with papillae, skeletal muscle fibres running in different directions
Slide
Oesophagus
Key Identifying Features
Stratified squamous non-keratinised epithelium, oesophageal glands in submucosa; muscle type varies along its length
Slide
Stomach (fundus)
Key Identifying Features
Short gastric pits, long straight gastric glands with pink parietal cells and basophilic chief cells
Slide
Duodenum
Key Identifying Features
Villi with Brunner's glands in the submucosa
Slide
Jejunum
Key Identifying Features
Tall villi and prominent circular folds, no Brunner's glands, no Peyer's patches
Slide
Ileum
Key Identifying Features
Villi with Peyer's patches (aggregated lymphoid follicles)
Slide
Large intestine (colon)
Key Identifying Features
No villi, straight crypts with many goblet cells
Slide
Appendix
Key Identifying Features
Small, often irregular lumen, abundant lymphoid follicles in the mucosa and submucosa, no villi
Slide
Liver
Key Identifying Features
Lobules with a central vein, cords of hepatocytes, sinusoids and portal triads at the periphery
Slide
Pancreas
Key Identifying Features
Serous acini with pale-staining islets of Langerhans
Slide
Gall bladder
Key Identifying Features
Tall columnar epithelium thrown into folds, no muscularis mucosae or submucosa
Slide
Parotid gland
Key Identifying Features
Purely serous acini, prominent ducts and fat cells
Slide
Submandibular gland
Key Identifying Features
Mixed gland, mainly serous acini with some mucous acini and serous demilunes
Slide
Sublingual gland
Key Identifying Features
Mixed gland, mainly mucous acini
Identifying Points: Respiratory, Urinary, Endocrine and Other Organs
| Slide | Key Identifying Features |
|---|---|
| Trachea | Pseudostratified ciliated columnar epithelium with goblet cells, seromucous glands, C-shaped hyaline cartilage |
| Lung | Thin-walled alveoli, bronchioles without cartilage, bronchi with cartilage plates |
| Kidney | Cortex with renal corpuscles (glomerulus and Bowman's capsule), proximal tubules with brush border, distal tubules with clearer lumen; medulla with collecting ducts |
| Ureter | Transitional epithelium, star-shaped lumen, thick muscle coat |
| Urinary bladder | Transitional epithelium, thick interlacing smooth muscle |
| Thyroid | Follicles filled with colloid, lined by cuboidal epithelium, parafollicular (C) cells |
| Suprarenal (adrenal) gland | Capsule, cortex in three zones (glomerulosa, fasciculata with pale columns of cells, reticularis), central medulla |
| Pituitary | Pars anterior with acidophils, basophils and chromophobes; pars posterior with nerve fibres and pituicytes |
| Testis | Seminiferous tubules with spermatogenic cells and Sertoli cells, Leydig cells in the interstitium |
| Ovary | Cortex with follicles at different stages, medulla with blood vessels |
| Cornea | Stratified squamous non-keratinised epithelium, Bowman's membrane, regular stroma, Descemet's membrane, endothelium |
| Cerebellum | Folia with molecular layer, Purkinje cell layer and granular layer |
| Umbilical cord | Two arteries and one vein embedded in Wharton's jelly |
Slide
Trachea
Key Identifying Features
Pseudostratified ciliated columnar epithelium with goblet cells, seromucous glands, C-shaped hyaline cartilage
Slide
Lung
Key Identifying Features
Thin-walled alveoli, bronchioles without cartilage, bronchi with cartilage plates
Slide
Kidney
Key Identifying Features
Cortex with renal corpuscles (glomerulus and Bowman's capsule), proximal tubules with brush border, distal tubules with clearer lumen; medulla with collecting ducts
Slide
Ureter
Key Identifying Features
Transitional epithelium, star-shaped lumen, thick muscle coat
Slide
Urinary bladder
Key Identifying Features
Transitional epithelium, thick interlacing smooth muscle
Slide
Thyroid
Key Identifying Features
Follicles filled with colloid, lined by cuboidal epithelium, parafollicular (C) cells
Slide
Suprarenal (adrenal) gland
Key Identifying Features
Capsule, cortex in three zones (glomerulosa, fasciculata with pale columns of cells, reticularis), central medulla
Slide
Pituitary
Key Identifying Features
Pars anterior with acidophils, basophils and chromophobes; pars posterior with nerve fibres and pituicytes
Slide
Testis
Key Identifying Features
Seminiferous tubules with spermatogenic cells and Sertoli cells, Leydig cells in the interstitium
Slide
Ovary
Key Identifying Features
Cortex with follicles at different stages, medulla with blood vessels
Slide
Cornea
Key Identifying Features
Stratified squamous non-keratinised epithelium, Bowman's membrane, regular stroma, Descemet's membrane, endothelium
Slide
Cerebellum
Key Identifying Features
Folia with molecular layer, Purkinje cell layer and granular layer
Slide
Umbilical cord
Key Identifying Features
Two arteries and one vein embedded in Wharton's jelly
Commonly Confused Slides
| Look-Alikes | How to Tell Them Apart |
|---|---|
| Lymph node versus spleen versus thymus | Lymph node has subcapsular sinus and peripheral follicles; spleen has scattered white pulp with central arterioles; thymus has Hassall's corpuscles and no follicles |
| Duodenum versus jejunum versus ileum | Brunner's glands (duodenum); tall villi with no special glands (jejunum); Peyer's patches (ileum) |
| Pancreas versus parotid | Islets of Langerhans in pancreas; prominent striated ducts and fat cells in parotid |
| Artery versus vein | Artery has a thick muscular wall and round lumen; vein has a thin wall and irregular, often collapsed lumen |
| Trachea versus oesophagus | Trachea has cartilage and pseudostratified epithelium; oesophagus has stratified squamous epithelium and no cartilage |
| Thick skin versus thin skin | Thick skin has stratum lucidum and no hair follicles; thin skin has hair follicles |
Look-Alikes
Lymph node versus spleen versus thymus
How to Tell Them Apart
Lymph node has subcapsular sinus and peripheral follicles; spleen has scattered white pulp with central arterioles; thymus has Hassall's corpuscles and no follicles
Look-Alikes
Duodenum versus jejunum versus ileum
How to Tell Them Apart
Brunner's glands (duodenum); tall villi with no special glands (jejunum); Peyer's patches (ileum)
Look-Alikes
Pancreas versus parotid
How to Tell Them Apart
Islets of Langerhans in pancreas; prominent striated ducts and fat cells in parotid
Look-Alikes
Artery versus vein
How to Tell Them Apart
Artery has a thick muscular wall and round lumen; vein has a thin wall and irregular, often collapsed lumen
Look-Alikes
Trachea versus oesophagus
How to Tell Them Apart
Trachea has cartilage and pseudostratified epithelium; oesophagus has stratified squamous epithelium and no cartilage
Look-Alikes
Thick skin versus thin skin
How to Tell Them Apart
Thick skin has stratum lucidum and no hair follicles; thin skin has hair follicles
Common Questions in Histology Practicals
Q: Which epithelium lines the urinary bladder, and why? A: Transitional epithelium, which can stretch as the bladder fills.
Q: What are Hassall's corpuscles? A: Concentric clusters of epithelial reticular cells in the thymic medulla, which help identify the thymus.
Q: Where are Brunner's glands found? A: In the submucosa of the duodenum. They secrete alkaline mucus that protects against acidic gastric contents.
Q: What are intercalated discs? A: Specialised junctions between cardiac muscle cells that allow them to contract together.
Q: Why does fibrocartilage lack perichondrium? A: It usually occurs where it merges with dense connective tissue such as tendons, ligaments and intervertebral discs.
Q: How do you identify the stain used? A: In H&E, nuclei stain blue-purple (haematoxylin) and cytoplasm and collagen stain pink (eosin).
Mistakes to Avoid
- Jumping to high power before scanning at low power
- Naming a slide from one feature without checking the look-alikes
- Drawing tiny diagrams with crowded labels
- Forgetting to mention the epithelium type for organs with a lumen
- Leaving the practical record incomplete until the last week
Frequently Asked Questions
How can I identify histology slides quickly in the practical exam?
Scan at low power first, identify the lining epithelium and look for the one unique feature of the slide, such as Brunner's glands, Peyer's patches or Hassall's corpuscles. Then confirm at high power.
Which histology slides are most important for MBBS?
Epithelia, cartilage, bone, muscle types, blood vessels, lymph node, spleen, thymus, the parts of the gut, liver, pancreas, kidney, trachea, lung and thyroid are the core slides to master first.
Which stain is used in routine histology slides?
Haematoxylin and eosin (H&E). Special stains, such as those for elastic fibres, are used for particular tissues.
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