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It inserts in the fascia of the facial muscles and in the skin above the eyes and nose. [2] Some sources consider the occipital and frontal bellies to be two distinct muscles. However, Terminologia Anatomica currently classifies it as a single muscle, and also includes the temporoparietalis muscle as part of the epicranius.
The muscle has no bony attachments. Its medial fibers are continuous with those of the procerus; its intermediate fibers blend with the corrugator and orbicularis oculi muscles, thus attached to the skin of the eyebrows; and its lateral fibers are also blended with the latter muscle over the zygomatic process of the frontal bone.
The corrugator supercilii muscle acts upon the skin of the forehead superior to the middle of the supraorbital margin, [1] drawing the eyebrow inferomedially to produce vertical wrinkles of the forehead [3] just superior to the nose. [1] It is the "frowning" muscle, and may be regarded as the principal muscle in the expression of suffering. [4]
Underneath skin of forehead Tensing and retracting scalp: Skin of scalp: Posterior: Occipitofrontalis, occipital belly: Occipital bone; mastoid process (temporal bone) Epicraneal aponeurosis Lowering eyebrows (e.g., scowling, frowning) Skin underneath eyebrows: Inferior: Corrugator supercilii: Frontal bone: Skin underneath eyebrow Flaring nostrils
The movements of the muscles in the forehead produce characteristic wrinkles in the skin. The occipitofrontalis muscles produce the transverse wrinkles across the width of the forehead, and the corrugator supercilii muscles produce vertical wrinkles between the eyebrows above the nose. The procerus muscles cause the nose to wrinkle. [6]
“We’ve always had these neck wrinkles but now they’re becoming more and more prominent, even in younger generations because everyone is constantly on their phones,” she points out.
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