Ectodermal appendages are organs associated with the skin like feathers and hair. We typically only call vertebrate skin elaborations "ectodermal appendages" even though other animal groups have skin ...Ectodermal appendages are organs associated with the skin like feathers and hair. We typically only call vertebrate skin elaborations "ectodermal appendages" even though other animal groups have skin organs (like glands) as well. In this section we will just focus on the vertebrate appendages with a special focus on the mammary glands.
