Ultrastructure of the equine hoof wall secondary epidermal lamellae.

The research article provides an examination of the ultrastructure of the secondary epidermal lamellae (SEL) in the hooves of adult horses, highlighting their non-mobile nature and interaction with primary epidermal lamellae (PEL).

Understanding the Secondary Epidermal Lamellae

• The study inspected the secondary epidermal lamellae cells which are part of the hoof wall structure in adult horses. The researchers did not observe any stages of progressive keratinization which refers to the process where dead cells harden to become surface tissue.

SEL and PEL Interaction

• The researchers noted the morphological characteristics of the cells in the secondary epidermal lamellae. The results indicated that these lamellae were composed of non-mobile cell populations. This implies that the cells in the SEL do not move or change position.
• The study also found that the primary epidermal lamellae moved past the secondary lamellae by breaking the desmosomes connecting the two cell populations. Desmosomes are structures that function as anchors, holding adjacent cells together. The PEL’s ability to move past the SEL suggests a dynamic interaction between these two hoof structures.

Remodelling By-products

• Moreover, the analysis revealed that what appeared to be debris present in the intercellular space between primary and secondary lamellae was actually a by-product of this remodeling. This means that as the primary lamellae move and the desmosomes disengage, waste materials are left in the intercellular spaces. These findings could provide insight into the structural dynamics within the hoof wall of adult horses and may have implications for understanding hoof health and disease.