Frontalis muscle
Encyclopedia
The Frontalis muscle
, also known as the occipitofrontalis or epicranius, is thin, of a quadrilateral form, and intimately adherent to the superficial fascia
. It is broader than the Occipitalis and its fibers are longer and paler in color. It is located on the front of the head.
It has no bony attachments.
Its medial fibers are continuous with those of the Procerus; its immediate fibers blend with the Corrugator
and Orbicularis oculi, 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
.
In the eyebrows, its primary function is to lift them (thus opposing the orbital portion of the orbicularis), especially when looking up. It also acts when a view is too distant or dim.
From these attachments the fibers are directed upward, and join the galea aponeurotica
below the coronal suture
.
The medial margins of the Frontales are joined together for some distance above the root of the nose
; but between the Occipitales there is a considerable, though variable, interval, occupied by the galea aponeurotica
.
It could be part of occipitofrontalis muscle
.
Muscle
Muscle is a contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to...
, also known as the occipitofrontalis or epicranius, is thin, of a quadrilateral form, and intimately adherent to the superficial fascia
Superficial fascia
Superficial fascia is found in the subcutis in most regions of the body, blending with the reticular layer of the dermis. It is present on the face, over the upper portion of the sternocleidomastoid, at the nape of the neck, and overlying the sternum. It is mainly loose areolar connective tissue...
. It is broader than the Occipitalis and its fibers are longer and paler in color. It is located on the front of the head.
It has no bony attachments.
Its medial fibers are continuous with those of the Procerus; its immediate fibers blend with the Corrugator
Corrugator supercilii muscle
The Corrugator supercilii is a small, narrow, pyramidal muscle, placed at the medial end of the eyebrow, beneath the Frontalis and just above Orbicularis oculi....
and Orbicularis oculi, thus attached to the skin of the eyebrows; and its lateral fibers are also blended with the latter muscle over the zygomatic
Zygomatic
Zygomatic can refer to:* Zygomatic bone* Zygomatic branches of the facial nerve* Zygomaticus major muscle* Zygomaticus minor muscle* Zygomatic nerve* Zygomatic process** Zygomatic process of frontal bone...
process of the frontal bone
Frontal bone
The frontal bone is a bone in the human skull that resembles a cockleshell in form, and consists of two portions:* a vertical portion, the squama frontalis, corresponding with the region of the forehead....
.
In the eyebrows, its primary function is to lift them (thus opposing the orbital portion of the orbicularis), especially when looking up. It also acts when a view is too distant or dim.
From these attachments the fibers are directed upward, and join the galea aponeurotica
Galea aponeurotica
The galea aponeurotica is a tough layer of dense fibrous tissue which covers the upper part of the cranium; behind, it is attached, in the interval between its union with the Occipitales, to the external occipital protuberance and highest nuchal lines of the occipital bone; in front, it forms a...
below the coronal suture
Coronal suture
The coronal suture is a dense, fibrous connective tissue joint that separates the frontal and parietal bones of the skull. At birth, the bones of the skull do not meet.-Pathology:...
.
The medial margins of the Frontales are joined together for some distance above the root of the nose
Human nose
The visible part of the human nose is the protruding part of the face that bears the nostrils. The shape of the nose is determined by the ethmoid bone and the nasal septum, which consists mostly of cartilage and which separates the nostrils...
; but between the Occipitales there is a considerable, though variable, interval, occupied by the galea aponeurotica
Galea aponeurotica
The galea aponeurotica is a tough layer of dense fibrous tissue which covers the upper part of the cranium; behind, it is attached, in the interval between its union with the Occipitales, to the external occipital protuberance and highest nuchal lines of the occipital bone; in front, it forms a...
.
It could be part of occipitofrontalis muscle
Occipitofrontalis muscle
The occipitofrontalis or epicranius is a muscle which covers parts of the skull. It consists of two parts or bellies: The occipital belly, near the occipital bone, and the frontal belly, near the frontal bone....
.