The back of your head is called the occiput. In everyday conversation people just say “the back of the head,” but the formal anatomical name is the occipital region, and the curved bone that forms it is the occipital bone. If a doctor notes tenderness “over the occiput” or a hairstylist mentions your “occipital ridge,” they are talking about the same area. The term comes from Latin and covers everything from the rounded dome behind the crown of your skull down to the base where your head meets your neck, and there is a surprising amount happening in that stretch of anatomy.
What the Occipital Bone Actually Looks Like
The occipital bone is not just a single curved plate. It has four main sections: the basioccipital part at the very bottom center of your skull (contributing to the base), two lateral pieces called the exoccipitals on either side, and the large curved squama that forms the broad back of the skull you can feel with your hand. All four parts fuse together during childhood. Nestled among them is the foramen magnum, the large opening where the spinal cord exits the brain and enters your spine. If any of these parts are underdeveloped, the foramen magnum can tilt or change shape, sometimes causing serious neurological problems.1Neurological Surgery and Anatomy. The occipital bone in type B basilar invagination
The occipital bone also forms joints with neighboring skull bones along suture lines. One of the most prominent is the lambdoid suture, the zigzag seam that runs across the back of the skull in a roughly inverted-V shape, connecting the occipital bone to the two parietal bones above it. Occasionally, small extra pieces of bone called Wormian bones develop inside or along the lambdoid suture. These are formed from independent ossification centers and are usually harmless anatomical curiosities, though finding a large number of them is rare.2Brazilian Journal of Case Reports. Multiple Wormian Bones in the Lambdoid Suture: A Report of Rare Occurrence
The Bump You Can Feel
Run your fingers along the midline of the back of your skull, starting from the top and moving down. About halfway between the crown and the base of your neck, you will feel a bump. That is the external occipital protuberance, sometimes called the inion. In some people it is barely noticeable; in others it juts out enough to be visible. The bump serves as an anchor point for the nuchal ligament, a tough band of connective tissue that runs down the back of your neck and helps keep your head from falling forward.
How prominent this bump is varies widely, and much of that variation is sex-linked. In a study of lateral skull radiographs from 1,000 subjects, a less prominent bump was found in about 85% of females compared to roughly 18% of males, while a pronounced spine-like protuberance appeared in about 63% of males versus only about 4% of females.3PubMed. The external occipital protuberance: can it be used as a criterion in the determination of sex? A more recent CT-based study from India confirmed these patterns and found that using the protuberance’s thickness and area could classify sex with about 89% accuracy overall.4Forensic Imaging. Sex Estimation Through External Occipital Protuberance Morphology: A CT Scan Study in Northwest India That makes the bump one of the more reliable single landmarks for forensic identification when a complete skeleton is not available.
Running laterally from the bump in both directions are ridges called the superior and inferior nuchal lines. These ridges are where several important neck and back muscles attach. Together, the bump and the lines give the back of your skull a kind of textured topography that you can sometimes trace with your fingertips, especially if you have short hair.
Muscles That Move and Stabilize Your Head
Beneath the skin and the thin layer of tissue at the back of your head lies a complex stack of muscles. The large, fan-shaped trapezius muscle climbs from your mid-back all the way up to the base of the skull, attaching along the nuchal lines. The sternocleidomastoid, which runs from your collarbone to just behind your ear, also plays a role in head rotation and flexion. These are the big, superficial movers.
Deeper underneath sit the suboccipital muscles, a small group of four paired muscles right at the junction of skull and spine. These are not power muscles. They act as fine-tuning stabilizers, constantly making tiny adjustments to keep your head balanced on top of the atlas vertebra.5PubMed Central. Suboccipital Muscles, Forward Head Posture, and Cervicogenic Dizziness Among them, the rectus capitis posterior muscles help maintain congruency between the skull and the top two vertebrae during head movements.6PubMed. Forward Head Posture and Activation of Rectus Capitis Posterior Muscles Think of them as a biological gimbal system: the big muscles point your head where you want it, and the suboccipitals keep it from wobbling once it gets there.
These deep muscles are also densely packed with proprioceptors, the sensory receptors that tell your brain where your body is in space. The cervical spine’s receptors connect to both the vestibular system (your inner-ear balance apparatus) and the visual system. If something goes wrong with them, you can end up with dizziness, poor balance, and impaired eye-movement control, even though your inner ear and eyes are perfectly healthy.7PubMed. Sensorimotor disturbances in neck disorders affecting postural stability, head and eye movement control This is why chronic neck tension at the back of the head can produce symptoms people mistake for an inner-ear problem.
Blood Supply to the Occiput
The scalp at the back of your head gets its blood from the occipital arteries, which branch off from the external carotid arteries on each side of your neck. These arteries initially run deep, passing under the attachment points of the trapezius and sternocleidomastoid muscles. As they climb toward the crown, they become more superficial, eventually fanning out to supply roughly the middle third of the occipital scalp.8PubMed. Arterial vascularization of occipital scalp: mapping of vascular cutaneous territories and surgical applications Surgeons who design tissue flaps for reconstructive work rely on mapping this blood supply carefully, since a flap taken from the back of the scalp needs a reliable feeding artery to survive once transplanted.
The scalp over the occiput is also richly supplied with veins. Cuts to the back of the head tend to bleed heavily because of this rich vascular network. That is why even a relatively minor scalp laceration from bumping your head on a cabinet can produce a dramatic amount of blood, disproportionate to the actual severity of the wound.
Occipital Neuralgia and Why the Back of Your Head Hurts
Pain at the back of the head is one of the more common reasons people look up this part of their anatomy in the first place. The greater and lesser occipital nerves emerge from the upper cervical spine and travel up through the muscles at the base of the skull to supply sensation to the back of the scalp. When these nerves become irritated, the result is occipital neuralgia: sudden, shooting or stabbing pain that radiates from the base of the skull upward along the back of the head.9PubMed Central. Neuralgias of the Head: Occipital Neuralgia
One proposed explanation for many cases is entrapment of the greater occipital nerve where it passes through the tendinous attachment of the trapezius muscle at the superior nuchal line. Chronic irritation at that spot may sensitize the pain pathways in the upper spinal cord, eventually producing referred pain that spreads forward into the forehead, temples, or even behind the eye, mimicking a migraine.10Journal of the Korean Medical Association. Diagnosis and treatment of occipital neuralgia: focus on greater occipital nerve entrapment syndrome If you have ever had a headache that starts at the base of your skull and wraps around to the front, this mechanism could be why.
Flat Head Syndrome in Babies
The occiput is also the area most affected by positional plagiocephaly, commonly known as flat head syndrome. Because babies spend so much time on their backs, prolonged pressure on one part of the soft, still-developing occipital bone can flatten it. In plagiocephaly, the flattening is on one side, making the head look asymmetric when viewed from above. In brachycephaly, the entire back of the head flattens and the skull appears wider than usual.11JAMA. Flat Head Syndrome in Infants Contributing factors include being a firstborn, premature birth, assisted delivery, and congenital muscular torticollis (a tightened neck muscle that keeps the baby’s head turned to one side).12PubMed Central. Diagnosis and treatment of positional plagiocephaly
The condition has become more common since the early 1990s, when “back to sleep” campaigns successfully reduced sudden infant death syndrome by encouraging parents to place babies on their backs. In most cases, positional plagiocephaly resolves on its own as the child grows, sits upright more, and spends less time lying on one spot. Tummy time while awake and repositioning the baby’s head during sleep help. Helmet therapy is sometimes used for more pronounced cases, though whether it speeds correction beyond what happens naturally is debated.
Much rarer is lambdoid craniosynostosis, in which the lambdoid suture fuses prematurely and physically constrains growth at the back of the skull. This produces a similar-looking asymmetry, but the mechanism is completely different, and surgery is typically needed to release the fused suture. When that suture fuses, patients consistently show cranial asymmetry, deflection of the posterior fossa on the affected side, and shifting of midface and ear structures toward the fused side.13FACE. Impact of the Extent of Suture Fusion and Minor Suture Involvement on Craniofacial Morphology in Unilateral Lambdoid Synostosis
Trauma and the Vulnerable Occiput
The back of the head is not the most commonly injured region in everyday falls, which tend to strike the forehead or temple. But when the occiput does take a direct blow, the consequences can be disproportionately serious. The brainstem sits just inside the foramen magnum, and a hard impact to the back of the skull can transmit force straight to it. Forensic neuropathology research has identified focal traumatic brainstem injury as a rare but specific pattern most often caused by direct impact at the back of the head, particularly from kicks or complex falls from height.14PubMed. Focal traumatic brain stem injury is a rare type of head injury resulting from assault: a forensic neuropathological study The brainstem controls breathing, heart rate, and consciousness, so damage there can be life-threatening even from injuries that look survivable.
This is part of why falls onto the back of the head in older adults are taken so seriously in emergency medicine, and why occipital skull fractures, even when linear and non-displaced, often warrant close monitoring.
How Upright Walking Reshaped the Occiput
The human occiput looks the way it does partly because we walk on two legs. In four-legged mammals, the head hangs off the front of the spine, suspended by a heavy muscular and ligamentous apparatus anchored to the back of the skull. In humans, the head sits on top of a vertical spine, and the foramen magnum has migrated to the underside of the skull rather than the rear. This means the occiput no longer has to bear the full weight of holding the head up against gravity.
The transition did not just move the hole. It changed what attaches around it. In quadrupedal animals like cats, the sternocleidomastoid complex attaches below the foramen magnum and the trapezius-related muscles attach above it, forming a muscular sling for the hanging head. In humans, those attachment points shifted, and the whole apparatus was repurposed primarily for stabilizing the shoulders and balancing the head during locomotion.15The FASEB Journal. Comparative Functional Morphology of the Head Suspension of Quadrupedal Cats and the Shoulder Suspension of Bipedal Humans
Humans also evolved a unique head-stabilization mechanism for running. We lost all direct muscular connections between the shoulder girdle and the skull except for the cleidocranial portion of the trapezius, which connects to the occiput via the nuchal ligament. Because that ligament leaves a trace on fossilized skulls, researchers have been able to date this system to roughly two million years ago, within the genus Homo.16Integrative and Comparative Biology. Humans use a unique mechanism to stabilize the head during running In other words, the back of your skull carries a physical record of when our ancestors started running long distances.
The Neanderthal “Bun” and What Skull Shape Tells Us
If you have ever seen a reconstruction of a Neanderthal skull, you probably noticed the prominent bulge at the back, sometimes called an occipital bun or “chignon.” For a long time, researchers treated this projecting occipital profile as an independent Neanderthal trait. But detailed shape analysis has shown that the occipital profile is tightly integrated with overall braincase shape. When you look at the midsagittal outline of the occipital bone alone, Neanderthals and modern humans overlap completely. The distinctiveness only emerges when you factor in the relative position and size of the occiput within the rest of the skull. A highly convex, posteriorly projecting occipital profile correlates strongly (above 0.8) with a flatter parietal profile and more forward-positioned temporal bones.17PubMed. The Neanderthal “chignon”: variation, integration, and homology
The takeaway is that the shape of the back of the skull is not an isolated feature but a reflection of how the entire braincase is proportioned. Modern humans occasionally have a noticeable occipital bun too. It does not mean Neanderthal ancestry; it means their overall skull proportions created the geometry for it. The back of the head, in evolutionary terms, is less a standalone landmark and more a downstream consequence of how the whole brain grew.
Text Neck and the Modern Occiput
The muscles at the back of your head evolved to keep a roughly ten-pound skull balanced on top of a vertical spine. When you tilt your head forward to look at a phone, the effective load on those muscles increases sharply because the head’s center of gravity moves in front of the spine’s axis. Prolonged forward head flexion while using handheld devices contributes to what is sometimes called text neck posture, a repetitive strain pattern involving excessive cervical flexion and associated pain.18Journal of Health, Wellness and Community Research. Prevalence of Text Neck Posture and Its Association with Smartphone Addiction Among Physical Therapy Students: A Cross-Sectional Study
The strain lands squarely on the suboccipital muscles and the muscles along the nuchal lines of the occipital bone. Over time, this sustained load can lead to tightness, tension headaches that radiate from the base of the skull, and the kind of neck stiffness that physical therapists see constantly. The fix is unglamorous: hold screens closer to eye level, take breaks, and strengthen the deep cervical flexors on the front of the neck so the back-of-the-head muscles are not doing all the work alone.
Using the Occiput in Forensic Identification
Forensic anthropologists often work with fragmentary skeletal remains, and the occiput is one of the more useful pieces when it survives. As noted above, the external occipital protuberance varies predictably by sex, but the rest of the occipital bone carries useful information too. The inion, the nuchal lines, and the external occipital crest are all more pronounced in males on average.4Forensic Imaging. Sex Estimation Through External Occipital Protuberance Morphology: A CT Scan Study in Northwest India The skull’s profile angle, formed by drawing lines from the forehead’s most prominent point to the inion and then to a horizontal reference, also differs between sexes.19PubMed Central. Contributions of anatomy to forensic sex estimation: focus on head and neck bones
Classification accuracy tends to be higher in older individuals, whose bony landmarks have had more time to develop under the influence of hormones and mechanical loading from muscle attachments. In younger adults and adolescents, the sex differences are subtler and the error rate climbs. Population-specific reference data also matter: a discriminant function built on one population’s measurements does not always transfer cleanly to another, which is why forensic standards are typically validated regionally.