File:Cell junction simplified.svg<unk> s <unk>  are very small stud- or rivet-like structures on the inner basal surface of keratinocytes in the epidermis of skin.  They are similar in form to desmosomes. The<unk>  comprises two rivet-like plaques (the inner and outer plaques), together with the anchoring fibrils and anchoring filaments these are collectively termed the<unk> -stable adhesion complex or<unk> -anchoring filament complex. 
Together, the<unk> -anchoring filament complex forms a continuous structural link between the basal keratinocyte keratin intermediate filaments and the underlying basement membrane zone (BMZ) and dermal components. Over the past decade, these structures have been shown to comprise a variety of some 10 or more molecular components.
An example configuration of a<unk>  might consist of cytosolic keratin, non-covalently bonded to a cytosolic plectin plaque, which is bonded to a single-pass transmembrane adhesion molecule such as the α6β4 integrin. The integrin might then attach to one of many multi-adhesive proteins such as laminin, resident within the extracellular matrix, thereby forming one of many potential adhesions between cell and matrix.
Electron microscopic analysis of the epidermal basement membrane zone (BMZ) reveals that it comprises a narrow and sometimes folded interface between the basal keratinocytes and the dermis. At high power, several complex structures are observed within the epidermal BMZ. The epidermal BMZ shows small (< 0.5 micrometers), regularly spaced electron dense structures which are the<unk> s. Thin, extracellular, electron-dense lines, parallel to the plasma membrane, subjacent to the outer plaque are visible in one third of<unk> s and are termed sub-basal dense plates (SBDPs).
Anchoring filaments traverse the lamina lucida space and appear to insert into the electron dense zone, the lamina densa. Beneath the lamina densa, loop-structured, cross-banded anchoring fibrils extend more than 300 nm beneath the basement membrane within the papillary dermis. The length of these loops may enable them to link or encircle dermal collagen fibers or other components such as those of the elastic microfibril network.
Hemidesmosome
Desmosome
Basolateral membrane
Tight junction
Apical membrane
Cuticle
Climbing fiber
Reticular fiber