Spongiosis involves-
Spongiosis is seen in intracellular ( in between keratinocytes ) edema. This results in loss of cohesion between epidermal cells which remain on contact with each other only at desmosomes and so acquire a stellate appearance giving the epidermis a sponge like appearance. Ref: Harrison20th edition pg 1208
Stratum basal
Stratum corneum
Stratum granulosum
Stratum spinosum
Anatomy of skin