Hyaline Cartilage Under the Microscope (Trachea Section)

Hyaline Cartilage (Trachea Section), Homo sapiens

Hyaline Cartilage (Trachea Section), prepared microscope slide

Although it is labeled as a bone cell slide, this section is really a cross section through the trachea (windpipe) showing hyaline cartilage, stained with H&E. It is useful for seeing cartilage cells and the lining of the airway.

This section of the trachea, or windpipe, is stained with H&E and shows a C-shaped ring of hyaline cartilage. The cartilage is a glassy, purple band with small cells called chondrocytes sitting in little pockets called lacunae. It has no blood vessels, and it keeps the airway from collapsing when you breathe in. On the inner side, a lining of tall cells with pale mucus cells faces the airway, and a layer of loose tissue with small blood vessels lies beneath it. Students can compare the smooth cartilage matrix with the layered look of bone.

Labeled hyaline cartilage under the microscope

Labeled hyaline cartilage of the trachea under the microscope showing the perichondrium, matrix, a chondrocyte in its lacuna, a blood vessel and the airway lining — Part of the C-shaped cartilage ring of the trachea, about 460 micrometers across, stained with H&E. Chondrocytes sit in their lacunae in the glassy matrix, and the airway lining runs along the bottom.

Perichondrium: Dense pink layer wrapping the cartilage, with flattened nuclei
Matrix: Smooth, glassy ground substance with no blood vessels
Chondrocyte in lacuna: A cartilage cell in its pocket, often with a clear ring around it
Blood vessel: In the loose tissue outside the cartilage, packed with red blood cells
Airway lining: Tall cells with nuclei at different heights and pale mucus cells

What to look for

Hyaline cartilage: A wide, smooth band of matrix, stained light purple to bluish, that forms the C-shaped tracheal ring.
Chondrocytes: Cartilage cells sitting in small spaces scattered through the matrix, sometimes in pairs or small groups.
Lacunae: The small pockets that hold the chondrocytes, sometimes showing a clear ring around the cell.
Pseudostratified ciliated columnar epithelium: The inner lining of the airway, with nuclei at different heights and a fringe of cilia on top.
Submucosa: Pink connective tissue between the lining and the cartilage, which may include small glands.

Questions and answers

What does hyaline cartilage look like under a microscope?

Hyaline cartilage looks like a smooth, glassy background with small cells (chondrocytes) sitting in little pockets called lacunae. It has no blood vessels, and the cells often sit in pairs or small groups.

Is this slide bone or cartilage?

It is cartilage. Bone has hard, layered rings (osteons) with cells in tiny spaces connected by channels, while this slide shows the smooth matrix and scattered cells of hyaline cartilage from the trachea.

Why does the trachea have cartilage?

The C-shaped rings of hyaline cartilage keep the trachea open so air can flow in and out. The open part of the C lets the esophagus behind it expand when you swallow.

Compare it

How to identify tissue types

Category: Histology and Tissue
Scan magnification: 20x
Stain: Hematoxylin and eosin

Viewing this slide in class

This is a scan of a real prepared slide, not a simulation or a drawing. On StudyScope you can pan from the whole slide down to individual structures, always in focus, and measure them in real micrometers with the calibrated ruler. Present it live and every student screen follows your view and annotations. Students join with a room code on Chromebooks, iPads, or any browser, with no accounts.