The top of your head is called the vertex, sometimes referred to informally as the crown. In anatomical terms, the vertex is the highest point of the skull when you are standing upright and looking straight ahead. It sits roughly where four major skull bones meet, and the region plays a surprisingly varied role in everything from infant development to thermoregulation to clinical diagnosis.
Where Exactly Is the Vertex
The vertex is not a single bone but a meeting zone. Four skull bones converge to form it: the frontal bone (your forehead), two parietal bones (the large plates on the sides and top), and the occipital bone (the back of your head). These bones are held together by sutures, which are fibrous joints unique to the skull. The coronal suture runs side to side, connecting the frontal bone to the two parietal bones. The sagittal suture runs front to back along the midline between the two parietal bones. And the lambdoid suture, further back, connects the parietal bones to the occipital bone.
In practice, when a doctor or anatomist says “vertex,” they mean the very top of the cranial vault. If you were to balance a book on your head, the spot where it would rest flattest is roughly the vertex. The term comes from the Latin for “whirlpool” or “turning point,” which is fitting given that it is also the spot where many people’s hair spirals into a whorl.
Crown Versus Vertex
In everyday conversation, most people say “crown of the head” rather than “vertex.” The two terms overlap but are not always identical. “Crown” tends to refer to a broader region, encompassing the general top and upper back of the skull. Hairdressers use “crown” to describe the area where hair growth patterns radiate outward, which is slightly behind the true anatomical vertex for many people. Dermatologists discussing pattern hair loss also refer to the crown as the zone where thinning often begins in men, which again sits a bit posterior to the strict anatomical highest point. So when someone says “crown,” they usually mean the neighborhood of the vertex rather than the precise point itself. In medical contexts, “vertex” is preferred because it is unambiguous.
The Soft Spot That Becomes the Vertex
If you have ever held a newborn, you were probably told to be careful of the “soft spot.” That soft spot is the anterior fontanelle, a diamond-shaped gap at the front of the skull’s top where the bones have not yet fused. It exists because a baby’s skull needs to be flexible enough to pass through the birth canal and to accommodate the rapid brain growth that happens in the first two years of life. The posterior fontanelle, a smaller gap near the back, usually closes within the first few months.
The anterior fontanelle is larger and more clinically relevant. A study of infants in central India found that about 20% of fontanelles had closed by the sixth month, while fewer than 1% remained open past 22 to 24 months. The average closure time was between 11 and 12 months for both full-term and preterm babies, with no significant difference between boys and girls.1National Journal of Clinical Anatomy. Norms for size and closure time of anterior fontanelle: a study on babies in Nagpur region Pediatricians routinely check the fontanelle during well-baby visits because a bulging soft spot can signal increased pressure inside the skull, while a sunken one can indicate dehydration.
Once the fontanelle closes and the sutures fully ossify, the vertex becomes a rigid dome. But the sutures themselves remain identifiable throughout life, and they matter clinically because they are structurally weaker than the surrounding bone.
What Happens When Skull Sutures Close Too Early
Occasionally, one or more sutures fuse before the brain has finished growing, a condition called craniosynostosis. The most common type involves the sagittal suture, the seam that runs along the midline directly beneath the vertex. When the sagittal suture closes prematurely, the skull cannot expand sideways as the brain grows. Instead, it compensates by elongating front to back, producing a narrow, boat-shaped head known as scaphocephaly.2PubMed Central. Isolated Sagittal Craniosynostosis: A Comprehensive Review
This is not merely a cosmetic issue. Premature fusion can restrict brain development and increase intracranial pressure if left untreated. Surgical correction, sometimes involving spring-assisted techniques that gently reshape the skull over weeks, aims to restore a more typical head shape and relieve pressure.3Journal of Craniofacial Surgery. Three-Dimensional Handheld Scanning to Quantify Head-Shape Changes in Spring-Assisted Surgery for Sagittal Craniosynostosis Research into public perception has found that observers tend to rate a child’s head shape as “normal” only when about 70% of the deformity has been corrected, a threshold that closely matches what surgeons aim for using standard measurements.4PubMed. Public Perception of a Normal Head Shape in Children With Sagittal Craniosynostosis
Layers of the Scalp
The vertex is not just bone. Above the skull sits the scalp, which has a surprisingly complex layered structure. Dissection studies have identified distinct layers stacked on top of one another. Starting from the outside, there is skin, then a layer of dense connective tissue packed with blood vessels, then the galea aponeurotica, a tough, flat tendon-like sheet that connects the frontalis muscle of the forehead to the occipitalis muscle at the back of the head. Beneath the galea lies a two-part layer of loose connective tissue: an outer layer rich in blood vessels and an inner layer that is essentially bloodless.5PubMed. Fascial layers of the scalp. A study of 48 cadaveric dissections The deepest layer, the pericranium, is a thin membrane that adheres directly to the bone.
This layered architecture matters practically. The rich blood supply in the outer layers means scalp wounds bleed profusely, which is alarming but also means they heal well. The loose connective tissue layer beneath the galea is sometimes called the “danger zone” of the scalp because infections or blood collections there can spread easily across a wide area. Surgeons operating on the top of the head have to navigate these layers carefully.
The Blood Vessel That Runs Beneath
Running along the underside of the vertex, inside the skull, is the superior sagittal sinus, a large venous channel that drains blood from the brain. It sits just beneath the sagittal suture and runs from the front of the skull to the back. Imaging studies have examined where exactly this sinus falls relative to the midline of the scalp, measuring it at anatomical landmarks including the bregma (where the coronal and sagittal sutures meet) and the lambda (where the sagittal and lambdoid sutures meet).6PubMed Central. Midline as a landmark for the position of the superior sagittal sinus on the cranial vault: An anatomical and imaging study
The clinical significance of this vessel becomes clear in traumatic injuries. Vertex epidural hematomas, blood clots that form between the skull and the brain’s outer membrane at the top of the head, are rare but dangerous. They are typically caused by a tear in the superior sagittal sinus after a blow to the top of the head.7PubMed Central. Vertex Extradural Hematoma: A Diagnostic Dilemma These hematomas are called a “diagnostic dilemma” because they can be missed on standard axial CT scans. The clot sits at the very top of the head and can be invisible on horizontal slices; coronal scans, which image the head from front to back, are often needed to spot them.8PubMed Central. Vertex epidural hematoma: An analysis of a large series In a series of vertex epidural hematoma cases, about two-thirds of patients with sagittal fractures or suture separations had bleeding from the superior sagittal sinus, and some experienced severe blood loss during surgery.9PubMed. Vertex epidural hematoma: Therapeutic consideration and outcome
Your Hair Whorl and Why It Spirals There
Most people have a single hair whorl near the crown, a spot where the hair grows in a spiral pattern. For about 92% of right-handed people, this whorl turns clockwise. The connection between hand preference and whorl direction is not a coincidence. Research suggests that a single gene influences both traits: in right-handed individuals, the gene tends to push the whorl clockwise, while in non-right-handed individuals, whorl direction appears random, going clockwise or counterclockwise at equal rates.10PubMed Central. Human handedness and scalp hair-whorl direction develop from a common genetic mechanism This is one of those findings that sounds almost too neat, but it has been replicated and the statistical coupling between handedness and whorl direction in right-handers is genuine.
The whorl is also the reason many people struggle to style hair at the crown. Hair radiates outward from that point, so any hairstyle that fights the natural growth direction tends to produce a stubborn cowlick. Barbers and stylists learn to work with the whorl rather than against it, cutting and blending around the crown to avoid a hair-standing-up look.
Why You Have Hair on Top at All
The top of the head is the most sun-exposed part of the body when you are upright, and scalp hair is not just decorative. A 2023 study using thermal manikins tested how different hair textures affect heat flow to and from the scalp. The researchers found that all hair types reduce heat gain from solar radiation, acting as a barrier that keeps the sun’s thermal energy from reaching the skin. But the most striking finding was that tightly curled hair provided the greatest protection, minimizing heat influx significantly better than straight hair. This fits with the evolutionary hypothesis that tightly curled hair evolved in equatorial populations as an adaptation against solar heat gain, allowing the brain to stay cooler.11PubMed Central. Human scalp hair as a thermoregulatory adaptation
The scalp itself also regulates temperature through blood flow. Cooling the scalp by even a modest amount causes a dramatic drop in blood perfusion through the skin. Research has shown that the first 10°C of cooling reduces scalp blood flow to below 40% of its baseline, with further cooling pushing it below 30% before reaching a plateau.12Physiological Measurement. The relationship between local scalp skin temperature and cutaneous perfusion during scalp cooling This response is the basis for scalp-cooling caps used during chemotherapy. By chilling the scalp, blood flow drops, and less of the chemotherapy drug reaches the hair follicles, reducing hair loss. The vertex and crown area are typically the most targeted zones during this treatment.
UV Damage at the Crown
Because the top of the head catches the most direct sunlight, the scalp there is vulnerable to UV damage. This is particularly true for people with thinning hair or bald spots at the crown. Laboratory studies on scalp skin exposed to UV radiation have found that high-dose UV exposure triggers changes in hair follicles, including increased expression of growth-inhibiting signals and decreased expression of growth-promoting ones. Specifically, a growth factor called TGF-β2, which can push hair follicles into a resting phase, was elevated as early as one day after UV exposure and remained high afterward.13PubMed Central. Transepidermal UV radiation of scalp skin ex vivo induces hair follicle damage that is alleviated by the topical treatment with caffeine In other words, the very region where men often lose hair first is also the region most exposed to radiation that can further stress follicles. Wearing a hat or applying sunscreen to a thinning crown is not vanity; it is skin care for a genuinely vulnerable spot.
Carrying Loads on Top of the Head
In many cultures worldwide, people carry heavy loads balanced on the top of the head. This practice, still common in parts of Africa and South Asia, takes advantage of the vertex’s position directly above the spine, which in theory allows for efficient weight transfer through the skeleton. Studies of women who carry head loads have found that the practice changes posture significantly: the upper trunk extends more and the head tilts less relative to the body, creating a more rigid column to stabilize the load. The body compensates for this stiffness by increasing motion at the pelvis.14Clinical Biomechanics. Posture of the trunk and head in women during head load carriage
The cost of this efficiency shows up over time. A study of manual laborers who regularly carry loads on their heads found measurable changes in the cervical spine. Cervical lordosis, the natural inward curve of the neck, decreased significantly under load and reversed outright in some subjects. Disc heights between vertebrae also decreased, and these changes were consistent with accelerated degenerative wear in the neck.15PubMed Central. The Effect of Head Loading on Cervical Spine in Manual Laborers The vertex is structurally equipped to bear some downward force, but the cervical spine beneath it was not designed for decades of heavy overhead loading.
The Crown Acupoint in Traditional Medicine
In traditional Chinese medicine, the point at the top of the head is called Baihui, or GV20, and it is one of the most commonly used acupuncture points. Its name translates roughly to “hundred convergences,” reflecting the traditional belief that many energy channels meet there. Whether or not you accept the theoretical framework, the anatomical location has been studied with modern imaging. MRI-based research placed GV20 in the scalp tissue directly above the frontal lobe, roughly 23 millimeters in front of the central sulcus in adults.16PubMed Central. Locating the Acupoint Baihui (GV20) Beneath the Cerebral Cortex with MRI Reconstructed 3D Neuroimages That places it over motor and premotor cortex, areas involved in movement planning.
Functional brain imaging after electroacupuncture at GV20 has shown changes in connectivity between brain regions, with networks centered on deep brain structures like the caudate nucleus and hypothalamus showing altered organization up to 15 minutes after needle removal.17PubMed. Key regions of the cerebral network are altered after electroacupuncture at the Baihui (GV20) and Yintang acupuncture points in healthy volunteers What these connectivity changes mean for clinical outcomes remains debated, but the point’s popularity in acupuncture practice for conditions ranging from headaches to depression is long-established.
What Other Animals Have at the Top of the Head
The vertex of the human skull is relatively plain compared to what some other species have evolved at the top of their heads. Many lizard species retain a parietal eye, a photosensitive organ embedded in the skull’s roof. A survey of 85 lizard species identified seven distinct types of this structure. The parietal eye does not form images the way a regular eye does; instead, it detects changes in light that help regulate circadian rhythms and thermoregulation. The structure is retained even in burrowing lizards, likely because it remains useful for sensing ambient light when the animal surfaces.18PubMed Central. Parietal eye-pineal morphology in lizards and its physiological implications
Whales and dolphins have gone in a different direction entirely. Their nostrils migrated from the front of the face to the top of the skull over millions of years, becoming the blowhole. Developmental studies of toothed and baleen whales show that the nasal passage rotated dorsally during this process, with distinct transformations in the two groups despite arriving at a functionally similar result.19PubMed Central. Different transformations underlie blowhole and nasal passage development in a toothed whale (Odontoceti: Stenella attenuata) and a baleen whale (Mysticeti: Balaenoptera physalus) In cetaceans, the top of the head became prime real estate for the most essential function of all: breathing without having to stop swimming.