The “crown” is a familiar term used to describe the very top of the human head. This common term corresponds to a precise anatomical landmark that plays a role in the structure of the skull and the patterns of hair growth. Understanding its precise location clarifies what constitutes the crown of the head.
Defining the Crown The Vertex
The crown of the head is formally known in anatomical terms as the vertex. This term refers to the single, highest point on the skull when the head is oriented in the standard anatomical position. The vertex is a specific midline landmark along the cranial vault, situated roughly equidistant from the ears and the eyes. It acts as a key reference for medical and anthropological measurements.
The Underlying Bony Structure
The physical location of the crown is defined by the bones of the skull that meet at this high point. The roof of the cranium is primarily formed by the paired parietal bones. These bones join along the midline of the head at the sagittal suture, which is an immovable, fibrous joint.
The vertex typically sits along the sagittal suture. Moving forward, the sagittal suture meets the coronal suture at a junction known as the Bregma. The coronal suture runs perpendicular to the sagittal suture, separating the parietal bones from the frontal bone.
How Hair Growth Patterns Define the Crown
For most people, the crown is visually recognized by the way the hair grows in this area. It is the most common location for a hair whirl, or cowlick, where hair follicles emerge from the scalp at a unique angle and direction. This genetically determined growth pattern creates a visible spiral that can run either clockwise or counter-clockwise. The hair growth direction at the vertex influences how the rest of the hair lies on the scalp.
The crown is frequently associated with common hair loss patterns, particularly in men. This area is susceptible to the effects of androgenetic alopecia, or male pattern baldness. Hair follicles in this region are sensitive to dihydrotestosterone (DHT), a hormone that causes the follicles to shrink over time. Hair loss typically begins with gradual thinning at the vertex, which eventually widens the visibility of the spiral pattern.