päänahasta

The Finnish word "päänahasta" translates to "from the scalp" or "of the scalp" in English. It refers to the skin that covers the top of the head, from the forehead to the nape of the neck and extending to the sides above the ears. This area is distinct from the face and other parts of the body due to its unique characteristics, most notably the presence of hair follicles.

The scalp is a complex structure composed of several layers, including the skin, subcutaneous tissue, galea aponeurotica, loose connective tissue, and pericranium. The skin of the scalp is generally thicker than that found on other parts of the body and is rich in sebaceous glands, which produce oil to lubricate the hair and skin. It also contains a high density of hair follicles, which are responsible for hair growth.

The blood supply to the scalp is extensive, originating from branches of the external and internal carotid arteries. This rich vascularization contributes to its ability to heal relatively quickly from injuries. Nerve innervation is provided by branches of cranial nerves and cervical nerves, allowing for sensation in the area.

Various conditions can affect the scalp, including common issues like dandruff, which is characterized by flaking skin, and more serious conditions such as psoriasis, eczema, and fungal infections. Hair loss, known as alopecia, is also a prevalent concern related to the scalp. The health of the scalp is closely linked to the health and appearance of the hair.