👉 Pleuracanthoid is a type of pharyngeal arch that arises from the thoracic vertebrae (thoracic vertebrae) and is not derived from any other bone. It is commonly found in humans but can also be present in other vertebrates such as birds, fish, and mammals. The pleuracanthoid structure is a small, flattened structure located at the end of the thoracic vertebrae that serves as a support for the thoracic cavity.