Integument in Different Classes of Chordates | Zoology
The fundamental structure of skin in all the vertebrates is the same but there are certain variations in different classes. 1. Protochordata: In Branchiostoma the skin is simple without keratin. The epidermis is single layered made of tall or columnar cells. These are ciliated in Balanoglossus. Epidermis has numerous unicellular gland cells which secrete a thin cuticle in Branchiostoma. Dermis [...]