Figure 2.

The model of the microstructure of reindeer hair. 2019. Compilation of sources. Courtesy of Denis Kukanov. Explanatory note: 1 – the cuticle is a scaly layer consisting of flat, cornified, transparent cells that protect the underlying layers from environmental exposure. 2 – the cortex is a cortical layer consisting of cells closely adjacent to each other with pigment grains longitudinally stretched and arranged along the length of the hair. This layer is poorly developed, which explains the fragility of deer hair. 3 – the core is a layer consisting of dried cornified formations, the space between which is filled with air, which explains the heat-insulating properties of deer fur.