Anatomy
The forehead comprises, and the musculature and skin of the forehead lies above, the portion of the frontal bone of the skull that is known as the squama frontalis, the plate-like portion of the frontal bone.
The sensory nerves of the forehead connect to the ophthalmic branch of the trigeminal nerve and the cervical plexus, and lie within the subcutaneous fat. The motor nerves of the forehead connect to the facial nerve.
The musculature of the forehead comprises the Occipitofrontalis, Procerus, and Corrugator supercilii muscles, all of which are controlled by the temporal branch of the facial nerve.
Blood supply to the forehead is via the left and right superorbital, supertrochealar, and anterior branches of the temporal artery.
The ophthalmic branch of the trigeminal nerve, the supraorbital nerve, divides at the orbital rim into two parts in the forehead. One part, the superficial division, runs over the surface of the Occipitofrontalis muscle. This provides sensation for the skin of the forehead, and for the front (anterior) edge of the scalp. The other part, the deep division, runs into the Occipitofrontalis muscle and provides frontoparietal sensation.
Read more about this topic: Forehead
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“Man is a shrewd inventor, and is ever taking the hint of a new machine from his own structure, adapting some secret of his own anatomy in iron, wood, and leather, to some required function in the work of the world.”
—Ralph Waldo Emerson (1803–1882)