What is the glabella?

The glabella refers to the smooth area of the forehead located just above the nose and between the eyebrows, which is part of the frontal bone of the skull. This area is noteworthy in anatomy for its significance in identifying landmarks of the face and head. The smooth surface of the frontal bone at the glabella is clinically relevant as it is often referenced in discussions of facial anatomy, cosmetic procedures, and even certain medical assessments.

The other options refer to different anatomical terms; for instance, a bone in the jaw does not pertain to the glabella, nor does muscle tissue or connective tissue, which are entirely different types of biological structures. This distinction reinforces the correct identification of the glabella as specifically a feature of the frontal bone, emphasizing the importance of precise terminology in medical contexts.