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The glabella is a bony point present on the frontal bone between the eyebrows and the nose. It is a relatively central position on the face, and the skin covering the glabella is known as glabellar skin. The glabellar complex muscles are depressors of the brow, and their contractions cause lines and furrows, often referred to as frown lines. The glabellar muscles include the corrugator supercilii, depressor supercilii, procerus, and orbicularis oculi para frontalis muscles. These muscles are treated with botox or botulinum toxin for aesthetic purposes to reduce the appearance of wrinkles and lines.
| Characteristics | Values |
|---|---|
| Definition | The glabella is a median elevation between two superciliary arches. |
| Location | The glabella is a bony point present on the frontal bone between the eyebrows and the nose. |
| Blood Supply | The glabella receives blood supply from the diploic veins present between the outer and inner table of the frontal bone. |
| Arteries | The supraorbital and supratrochlear arteries (branches of the ophthalmic artery) supply the forehead and medial canthal area. |
| Muscles | The glabellar complex muscles include the procerus, corrugator supercilii, depressor supercilii, orbicularis oculi, and frontalis fibers. |
| Function | The glabellar complex muscles are depressors of the brow, causing lines and furrows on contraction. |
| Treatment | Glabellar lines can be treated with botulinum toxin type A (BoNTA) injections, which require a thorough understanding of facial anatomy and muscle interaction. |
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What You'll Learn
- The glabellar complex includes the procerus, corrugator supercilii, depressor supercilii, and orbicularis oculi muscles
- Glabellar lines are formed by the interaction of small muscle group contractions
- Glabellar skin is treated with botox for aesthetic purposes
- The glabella is a bony point present on the frontal bone between the eyebrows and the nose
- The glabellar complex develops from the second pharyngeal arch
The glabellar complex includes the procerus, corrugator supercilii, depressor supercilii, and orbicularis oculi muscles
The glabella is a bony point present on the frontal bone between two superciliary arches. The skin covering the glabella is known as glabellar skin. The glabellar complex is made up of the procerus, corrugator supercilii, depressor supercilii, and orbicularis oculi muscles.
The procerus muscle is a pyramidal-shaped muscle of facial expression that is part of the glabellar complex. It is derived from the second pharyngeal arch and is innervated by branches of the facial nerve. The procerus muscle fibres run superiorly and merge with the frontalis muscle, inserting into the skin between the eyebrows. The corrugator supercilii muscles are a pair of small pyramidal muscles that lie deep to the frontal portion of the occipitofrontalis and the orbicularis oculi muscles. They arise from the medial supraorbital ridge of the frontal bone and travel laterally and above the orbital rim to become more superficial. The corrugator supercilii muscles work with other muscles of the glabellar complex to maintain a balanced brow position and shape. They also contribute to the formation of glabellar skin lines.
The depressor supercilii muscle, along with the corrugator supercilii and orbicularis oculi muscles, depress the medial eyebrow, producing transverse cutaneous furrows and assisting nostril flaring. The orbicularis oculi muscle is part of the circumorbital and palpebral group of facial muscles. It is innervated by branches of the facial nerve. The orbicularis oculi and corrugator muscles work together to pull the eyebrows medially and inferiorly, which can serve to protect the eyes from bright sunlight or rain.
The glabellar complex muscles are depressors of the brow. On contraction, they cause lines and furrows, often referred to as frown lines. The procerus muscle generally causes horizontal lines, while the corrugator supercilii muscles produce more vertical lines. Glabellar line treatment can be used to reduce the appearance of these lines, though the effect is temporary, with results peaking at 4 weeks.
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Glabellar lines are formed by the interaction of small muscle group contractions
The glabella is a bony region between the eyebrows and the nose. The skin covering the glabella is known as glabellar skin. The glabellar complex muscles are depressors of the brow, and when contracted, they cause lines and furrows. Glabellar lines are formed by the interaction of small muscle group contractions.
The muscles of the glabellar complex include the procerus, corrugator supercilii, depressor supercilii, orbicularis oculi, and frontalis fibres. The procerus muscle generally causes horizontal lines, while the corrugator supercilii muscles produce more vertical lines. The corrugator supercilii muscle also contributes to the formation of the oblique component of the glabellar skin line. The oblique head of the corrugator supercilii muscle, the depressor supercilii muscle, and the medial head of the orbital portion of the orbicularis oculi muscle all appear to depress the medial head of the eyebrow and contribute to the formation of the oblique glabellar skin line.
The glabellar complex muscles produce different patterns of wrinkles and lines on the forehead by contraction and relaxation. There are five known types of patterns identified in European and American races, while researchers have identified six patterns in the Asian race. These hyper-functional lines are implicated in the multifarious facial expressions such as fatigue, quizzical, and, at times, anger.
The formation of glabellar lines can be treated with botulinum toxin type A (BoNT-A) injections. The One21 Technique is an individualised treatment for glabellar lines that has yielded better results than the standard 5-point treatment in reducing glabellar dynamic lines with Incobotulinumtoxin-A, especially for asymmetric lines of the glabella or the involvement of muscle groups other than the procerus and corrugator.
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Glabellar skin is treated with botox for aesthetic purposes
The glabella is a bony point present on the frontal bone between the eyebrows and the nose. The skin covering the glabella is known as glabellar skin. The glabellar complex muscles are depressors of the brow and, on contraction, they cause lines and furrows. The procerus muscle generally causes horizontal lines, while the corrugator supercilii muscles produce more vertical lines. These hyper-functional lines are implicated in the multifarious facial expressions such as fatigue, quizzical, and mistakenly at times, anger.
Glabellar rhytids appear deep due to the thick skin of the glabella compared to the crow's feet (wrinkles at the lateral end of the eyes). Glabellar rhytides become more prominent in advanced age; nowadays, botulinum toxins are injected to hide glabellar rhytids for aesthetic purposes. The first area to receive cosmetic treatment with botox A injection was the glabella. Botox Cosmetic (onabotulinumtoxin A) is a form of botulinum toxin type A developed by Allergan. It's a purified protein used as a cosmetic treatment to target specific facial muscles, temporarily relaxing them. This relaxation smooths wrinkles and creases formed by repeated muscle contractions.
The aesthetic use of onabotulinumtoxin A has become enticing and accessible to the general public. In an interview in The New York Times, dermatologist Dr. Patricia Wexler commented, "Botox is like grooming now. It’s socially acceptable, even expected." Botox featured on the December 10, 2001, cover of The New Yorker. The discovery of onabotulinumtoxin A’s aesthetic benefits occurred serendipitously in the 1980s at the intersection of several medical disciplines, including ophthalmology, neurology, otolaryngology, and dermatology. Patients receiving onabotulinumtoxin A for blepharospasm, hemifacial spasm, and dystonia noticed their periorbital wrinkles disappearing, particularly frown lines between the eyebrows called glabellar lines (GL).
While Glabellar Botox is a popular and effective treatment for frown lines, it's not the only option. The world of aesthetics offers other injectable neuromodulators with similar results to Botox, such as Dysport, Jeuveau, Daxxify, and Xeomin.
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The glabella is a bony point present on the frontal bone between the eyebrows and the nose
The glabella is a bony landmark present in the outer table of the frontal bone in the middle of the superciliary arches. The glabella receives blood supply from the diploic veins present between the outer and inner table of the frontal bone. Arteries supplying the skin and muscles over the glabella also give branches to the glabella. The glabella is in near relation to the frontal sinuses and nasion. It is also an important bony landmark for sexual dimorphism, developmental and comparative anatomy, and gives attachment to the fibres of the orbital part of the orbicularis oculi and procerus muscle.
The muscles of the glabellar complex include the corrugator supercilii, depressor supercilii, orbicularis oculi, frontalis, and procerus. The glabellar complex muscles are depressors of the brow, and when contracted, they cause lines and furrows. The procerus muscle generally causes horizontal lines, while the corrugator supercilii muscles produce more vertical lines. The hyper-functional lines created by the glabellar complex muscles are implicated in the multifarious facial expressions such as fatigue, quizzical, and mistakenly at times, anger.
Glabellar expression lines result from the interaction of small muscle group contractions. Over time, dynamic lines become static wrinkles, which can adversely affect the perception of emotions. As such, the treatment of glabellar lines is a common request in dermatologic daily practice. The introduction of botulinum neurotoxin type A (BoNTA) for the treatment of glabellar lines marked a revolution in aesthetic medicine, allowing for non-invasive facial rejuvenation and sculpting.
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The glabellar complex develops from the second pharyngeal arch
The glabellar complex is a group of muscles that includes the procerus, corrugator supercilii, depressor supercilii, orbicularis oculi, and frontalis fibres. These muscles are responsible for various facial expressions and the formation of wrinkles and lines on the forehead.
The muscles of the glabellar complex develop from the second pharyngeal arch during fetal life. The second pharyngeal arch, also known as the hyoid arch, is one of five pharyngeal arches that develop in the fourth week of fetal development. These arches are transient structures observed in the embryonic development of humans and other vertebrates and are recognisable precursors for many structures.
In the human embryo, the pharyngeal arches first appear as a series of outpouchings of mesoderm on both sides of the developing pharynx. The arches are derived from all three germ layers, the primary layers of cells that form during embryonic development. Neural crest cells enter these arches and contribute to the formation of the skull and facial skeleton, including bone and cartilage.
The second pharyngeal arch specifically assists in forming the side and front of the neck. The cartilage in this arch is known as Reichert's cartilage and contributes to numerous structures in the fully developed adult. For example, the dorsal ends of Reichert's cartilage ossify to form the stapes of the middle ear, while the ventral portion forms the lesser cornu and upper part of the hyoid bone.
The development of the glabellar complex from the second pharyngeal arch highlights the importance of this embryonic structure in shaping the head and neck region, including the formation of muscles that play a role in facial expressions and the appearance of wrinkles.
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Frequently asked questions
The glabellar muscle is located in the glabellar region, which is the area between the eyebrows and the nose.
The glabellar muscle is responsible for forming expression lines on the forehead, which can range from fine lines to deep furrows. These lines can convey emotions such as fatigue, anger, or anxiety.
The appearance of the glabellar muscle can be altered through treatments such as botulinum toxin type A (BoNTA) injections, eyebrow resuspension, and nerve ablation techniques. These treatments can reduce the appearance of wrinkles and lines in the glabellar region.
