The glabella is the smooth, bony area on the frontal bone of the skull located between the eyebrows and above the bridge of the nose. It serves as a distinct anatomical landmark in the midline of the face, specifically situated between the superciliary arches.
Anatomical Location and Features
The glabella is a key feature of the human skull, specifically found on the outer table of the frontal bone. Its central position makes it a recognizable point on the forehead. While it is generally a smooth, slightly depressed, or flat area, its prominence can vary among individuals.
- Location: Directly above the nose, between the medial ends of the eyebrows.
- Bony Structure: Part of the frontal bone, which forms the forehead.
- Relationship to Superciliary Arches: It lies in the middle of the two superciliary arches, which are the prominent ridges above the orbits (eye sockets).
- Blood Supply: This region receives its blood supply from the diploic veins, which are a network of veins located within the diploë – the spongy bone layer found between the inner and outer tables of the frontal bone.
Clinical and Aesthetic Significance
Beyond its anatomical definition, the glabella holds practical importance in various fields, from craniometry to cosmetic procedures.
Craniometric Point
As a defined point on the skull, the glabella is used in craniometry, the scientific measurement of the skull. It helps in:
- Anthropological studies: Understanding human variation and evolution.
- Forensic analysis: Identifying individuals or estimating demographic information.
- Medical imaging: Serving as a reference point for precise measurements in MRI or CT scans.
Aesthetic and Dermatological Relevance
The glabella region is frequently involved in both aesthetic treatments and common dermatological conditions.
- Wrinkle Formation: The muscles in this area (procerus and corrugator supercilii) are responsible for frown lines or "eleven lines" that develop between the eyebrows.
- Botox Injections: Botulinum toxin (Botox) is commonly injected into these muscles to relax them, reducing the appearance of glabellar lines and providing a smoother forehead.
- Skin Conditions: Due to its prominent location and sebaceous glands, the glabella can be susceptible to:
- Acne: Blocked pores leading to breakouts.
- Folliculitis: Inflammation of hair follicles.
- Contact dermatitis: Skin irritation from allergens or irritants.
| Feature | Description |
|---|---|
| Location | Frontal bone, between eyebrows |
| Type | Bony landmark |
| Blood Supply | Diploic veins (between inner & outer tables of frontal bone) |
| Significance | Craniometric point, aesthetic treatment area, dermatological concern |
| Appearance | Smooth, flat, or slightly depressed area; varies between individuals |
Practical Insights
- Self-Examination: Gently pressing your finger between your eyebrows allows you to feel the bony prominence of the glabella.
- Sun Protection: As a prominent part of the face, the glabella is exposed to the sun and requires adequate sun protection to prevent sunburn and premature aging.
For further information on human anatomy, you can refer to resources like Wikipedia's page on the Glabella or TeachMeAnatomy.
