The term 'portion of the head' can be summarized as the SCALP, which is a five-letter word. The SCALP is the layer of skin that covers the top and back of the head. It is composed of several layers of tissue, including skin, muscle, and connective tissue. The SCALP also contains hair follicles, sebaceous glands, and sweat glands. It is an important part of the body's protective system, as it helps to keep the head warm and protect it from injury.