Diagram of stratified columnar epithelium from difore's
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Now let me search for stratified columnar epithelium in DiFore's (di Fiore's Atlas of Histology).
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The user asked specifically for "DiFore's" - this refers to "di Fiore's Atlas of Histology." The closest match in the library is "Histology A Text and Atlas With Correlated Cell and Molecular Biology" (ISBN 9781975181512), which is the Ross & Pawlina atlas. Let me check what histology atlases are available and look at the Plate 19.2 content which has the stratified columnar epithelium with an image.
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I can see the images. The library doesn't have di Fiore's specifically, but "Histology A Text and Atlas" (Ross & Pawlina) has excellent plates of stratified columnar epithelium from the larynx. Let me fetch the most relevant images showing the stratified columnar epithelium.
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These are orientation/thumbnail diagrams. Let me also fetch the third image (the full plate with labels) and check Junqueira's for the stratified columnar diagram:
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Let me look for the specific diagram of stratified columnar epithelium in Junqueira's (which has a Figure 4-15 showing all stratified epithelia types):
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I can see Figure 4-15 on stratified epithelium. Let me read more to find the stratified columnar portion and fetch that image:
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The Figure 4-15d image (showing stratified cuboidal/columnar in sweat gland ducts) is at line 3207. Let me fetch the relevant images - the diagram at 3199 and the multi-panel figure at 3207:
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Excellent! Now I have what I need. Note that the library does not contain di Fiore's Atlas specifically (it's not in the collection), but I have the best available histology atlas resources. The first image (4682...) is the schematic diagram of stratified squamous epithelium from Junqueira's. The second shows histological sections (b = esophagus nonkeratinized stratified squamous, c = cornea, d = sweat gland ducts with stratified columnar). The key diagram labelled with Epithelium/Basement membrane/Lamina propria is actually the stratified squamous schematic. Let me also check the Ross & Pawlina plate 19.2 image which directly shows the SCE:
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The exact URL in my earlier read had a slightly different hash. Let me use the correct URL from line 147:
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The URL has a typo - let me check the exact URL from the file again. The line 147 text shows
8b7deea0685ce81c1c9637b278a5959d95668806322d81fd97923e1709c20389 but the original read showed 8b7deea0685ce81c1c9637b278a5959d95668806322d81fd97923e1709c20389. Let me re-read that line precisely:Reading File
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This is an excellent image. Now I have everything needed to give a comprehensive answer. Note that "DiFore's" (di Fiore's Atlas of Histology) is not in the library collection, but the available histology atlases - particularly Ross & Pawlina's "Histology: A Text and Atlas" - contain very clear plates showing stratified columnar epithelium.
Stratified Columnar Epithelium
Note: Di Fiore's Atlas of Histology is not available in this library. The images and descriptions below come from Ross & Pawlina's Histology: A Text and Atlas with Correlated Cell and Molecular Biology (Plate 19.2) and Junqueira's Basic Histology, 17e (Figure 4-15), which are the standard equivalent references for this topic.
Plate 19.2 - Larynx (Ross & Pawlina) - H&E, Monkey
The plate below shows the three epithelial types in the larynx. Stratified columnar epithelium (SCE) appears at the transitional zones:
Key labels:
- SCE - Stratified columnar epithelium (surface cells are tall/columnar)
- SSE - Stratified squamous epithelium (surface cells are flat)
- PSE - Pseudostratified columnar epithelium (appears below the SCE)
- Gl - Glands in the lamina propria
- VM - Vocalis muscle | VF - Vocal folds | VnF - Ventricular folds | V - Ventricle
The three lower panels show progressively higher-magnification views of the junction regions. The middle lower panel (labelled SCE) is the most instructive: note how the surface cells are distinctly taller (columnar) than the flatter basal cells, and compare directly with the SSE above it and the ciliated PSE to the right.
Schematic Diagram of Stratified Epithelium (Junqueira's, Figure 4-15)
This 3D schematic clearly shows the key structural features shared by all stratified epithelia:
- Multiple cell layers resting on a basement membrane
- Basal cells (more cuboidal/polygonal) near the basement membrane
- Surface (apical) cells - in stratified columnar, these are tall columnar cells
- Underlying lamina propria of connective tissue
Key Features of Stratified Columnar Epithelium
| Feature | Details |
|---|---|
| Layers | 2 or more layers; basal cells are shorter/polyhedral, surface cells are tall columnar |
| Location | Conjunctiva of eyelids, excretory ducts of large glands, anorectal junction, parts of the larynx (transitional zone), male urethra |
| Function | Protection + secretion (contains goblet cells in conjunctiva) |
| Rarity | Relatively rare - usually occurs as a transitional zone between stratified squamous and pseudostratified/simple columnar epithelium |
As noted in Junqueira's Basic Histology, 17e (p. 226): "Stratified columnar epithelium occurs in the conjunctiva lining the eyelids, where it is both protective and mucus-secreting... it usually occurs between stratified squamous epithelium and some other epithelial types."
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