FCPS Part 1 histology: the high-yield guide
Histology questions ask you to match a tissue to its lining, its special cells or its one distinguishing feature. Learn the distinguishing features, not every layer.
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How histology is asked
Histology in FCPS Part 1 is rarely about drawing a slide. The questions are short:
- Which epithelium lines this organ?
- Which cell makes this secretion?
- Which feature tells these two tissues apart?
- Which junction or protein is the target of this disease?
So the useful way to study is by distinguishing features. For each organ, ask what makes it different from its neighbour.
Epithelium and where to find it
| Epithelium | Classic sites |
|---|---|
| Simple squamous | Alveoli, endothelium, mesothelium, Bowman capsule |
| Simple cuboidal | Thyroid follicles, kidney tubules, ovary surface |
| Simple columnar | Stomach, small and large intestine, gallbladder |
| Pseudostratified ciliated columnar | Trachea, bronchi, nasal cavity |
| Pseudostratified with stereocilia | Epididymis, vas deferens |
| Stratified squamous non-keratinised | Oesophagus, vagina, cornea, mouth |
| Stratified squamous keratinised | Skin |
| Transitional (urothelium) | Renal pelvis, ureter, bladder |
| Stratified cuboidal | Sweat gland ducts |
Senior’s tip
Traps: the epididymis has stereocilia, which are long microvilli, not cilia. The gallbladder has simple columnar epithelium but no muscularis mucosae and no submucosa.
Junctions and the diseases that target them
| Junction | Protein | Disease link |
|---|---|---|
| Tight junction | Claudins, occludin | Barrier between cells |
| Adherens | E-cadherin | Lost in diffuse gastric and lobular breast cancer |
| Desmosome | Desmoglein | Pemphigus vulgaris (intraepidermal blister) |
| Hemidesmosome | BP180, BP230 | Bullous pemphigoid (subepidermal blister) |
| Gap junction | Connexins | Electrical coupling in heart and smooth muscle |
Cartilage and bone
- Hyaline cartilage: type II collagen; articular surfaces, trachea, costal cartilage.
- Elastic cartilage: elastic fibres; ear, epiglottis.
- Fibrocartilage: type I collagen; intervertebral discs, menisci, pubic symphysis.
- Bone: osteoblasts build, osteocytes sit in lacunae, osteoclasts (from monocytes) resorb. Haversian canals run lengthwise; Volkmann canals connect them.
Muscle
| Feature | Skeletal | Cardiac | Smooth |
|---|---|---|---|
| Nuclei | Many, peripheral | One or two, central | One, central |
| Striations | Yes | Yes | No |
| Special feature | — | Intercalated discs | Dense bodies |
The gut, segment by segment
This is where most histology marks sit.
| Region | The feature that identifies it |
|---|---|
| Oesophagus | Stratified squamous epithelium; upper third skeletal muscle, lower third smooth |
| Stomach (body) | Parietal cells (acid, intrinsic factor) and chief cells (pepsinogen) |
| Duodenum | Brunner glands in the submucosa (alkaline mucus) |
| Jejunum | Tall villi, prominent plicae circulares |
| Ileum | Peyer patches |
| Colon | No villi, many goblet cells, taeniae coli |
| Appendix | Lymphoid follicles in the wall |
Paneth cells at the base of the crypts make lysozyme and defensins.
Liver and pancreas
- The hepatic acinus has three zones. Zone 1 sits around the portal triad and gets the most oxygen. Zone 3 is around the central vein and is damaged first by paracetamol, alcohol and low blood flow.
- The space of Disse lies between hepatocytes and sinusoids. Ito (stellate) cells there store vitamin A and drive fibrosis.
- In the pancreas, beta cells sit in the centre of the islets and alpha cells at the edge. Centroacinar cells are unique to the pancreas.
Lung
- Type I pneumocytes cover most of the alveolar surface for gas exchange.
- Type II pneumocytes make surfactant and repair the lining.
- Club (Clara) cells in the bronchioles secrete protective proteins and lack cilia.
- Cartilage disappears at the bronchiole level.
Kidney
- Proximal tubule: brush border, many mitochondria. It reabsorbs most filtered sodium and all glucose.
- Juxtaglomerular cells in the afferent arteriole make renin. The macula densa in the distal tubule senses salt.
- Podocytes form the slit diaphragm. Their foot processes flatten in minimal change disease.
Lymphoid organs
| Organ | Identifying feature |
|---|---|
| Thymus | Hassall corpuscles in the medulla; no germinal centres |
| Lymph node | B cells in follicles (cortex), T cells in the paracortex |
| Spleen | White pulp (periarteriolar T-cell sheaths and B follicles), red pulp sinusoids |
| Tonsil | Crypts lined by stratified squamous epithelium |
Endocrine glands
- Thyroid: follicles with colloid. Parafollicular C cells make calcitonin.
- Adrenal cortex: glomerulosa (aldosterone), fasciculata (cortisol), reticularis (androgens). "Salt, sugar, sex: the deeper you go, the sweeter it gets."
- Pituitary: anterior lobe is glandular (from Rathke pouch); posterior lobe is neural, with Herring bodies.
Common traps
- Simple columnar epithelium with goblet cells in the oesophagus means Barrett metaplasia.
- Transitional epithelium changes shape when the bladder stretches. Do not mistake it for stratified squamous.
- Thymus has no germinal centres. A lymph node does.
- Elastic arteries such as the aorta have many elastic laminae in the media. Muscular arteries have a clear internal elastic lamina.
How to revise histology in five days
- Day 1: epithelium, junctions and glands.
- Day 2: connective tissue, cartilage, bone and muscle.
- Day 3: gut, liver, pancreas and gallbladder.
- Day 4: lung, kidney, urinary tract and reproductive organs.
- Day 5: lymphoid and endocrine organs, then a mixed question set.
Practise these in the FCPS-1 Prep question bank. Histology questions link to topic reviews that put the neighbouring tissues side by side.
Read next: Anatomy high-yield · Embryology high-yield · Pathology high-yield
Frequently asked questions
Is histology part of anatomy in FCPS Part 1?
Yes. It is examined within anatomy, alongside gross anatomy, neuroanatomy and embryology.
Do I need to look at slides?
A few labelled images help you remember, but questions are mostly text-based and test identifying features.
Which histology topics are most important?
The gut segments, epithelium types, lymphoid organs and the kidney come up most often in recall lists.