The eyebrows (Latin: supercilia) are situated at the junction of the forehead and the upper eyelid.

Structure of the eyebrows

The eyebrows have a medial and lateral end, with the medial end being just below the orbital margin, while the lateral end lies above the orbital margin. The hair within the eyebrows is thick and horizontally laterally directed. The movement of the eyebrows is allowed by some of the muscles inserted into the skin. Three muscles are involved in the movement of the eyebrows:

  • the frontalis muscle - responsible for raising the eyebrows;
  • the orbital part of the orbicularis oculi muscle - responsible for lowering the eyebrows;
  • the corrugator supercilii muscle - draws the eyebrows medially.

Vasculature and innervation of the eyebrows

Blood supply and venous drainage

The eyebrows are supplied by the supraorbital and supratrochlear branches of the ophthalmic artery.

Venous drainage happens through the corresponding veins. The blood drains into the angular vein, followed by the facial vein.

Lymphatic drainage

The lymph from the medial end of the eyebrows drains into the submandibular nodes, while from the lateral end - the superficial parotid nodes.

Innervation of the muscles

These muscles are innervated by the facial nerve (CN VII).