Should Medical Schools Require Population-Specific Anatomical Curricula?

Anatomy remains the foundational language of medicine and underpins every physical examination, imaging interpretation and invasive procedure.¹ Yet most medical schools still teach a single, rigid anatomical template derived largely from Western cadaveric material and historical atlases. This model implicitly assumes that there is one 'standard' human body and that everything else can be treated as a rare deviation.

Decades of work in skeletal anthropology, clinical anatomy and radiological morphometry have shown that this assumption is false: anatomical variation is patterned, not random, and many patterns correlate strongly with population, geography and ancestry.² Despite this, undergraduate anatomy often relegates variants to the margins of the curriculum as curiosities, rather than integrating them as expected findings in specific populations. The result is a widening gap between classroom expectations and real-world anatomy encountered in theatres, clinics and radiology suites.

This editorial adopts a narrative, evidence-informed approach rather than a formal systematic review. Sources were drawn from peer-reviewed clinical anatomy, radiology and surgical journals, emphasising large cadaveric series, imaging-based morphometric surveys and meta-analyses that reported population- or region-specific data on anatomical variation. Particular attention was paid to vascular branching patterns, paranasal sinus and skull base anatomy, nerve trajectories and musculoskeletal morphometry.^{3, 4}

All references were checked for DOI validity where applicable, and prevalence figures quoted in this article are taken directly from published results without recalculation. The goal is to translate existing anatomical evidence into a coherent argument for population-specific curricula, rather than to generate new pooled estimates.

Vascular anatomy provides some of the clearest examples of structured population-specific variation. Meta-analytic work on accessory renal arteries and other additional renal vessels shows prevalence commonly exceeding 30% in several South Asian and South American CTA cohorts, whereas many European series report frequencies closer to 20–25%.³ These differences are not academic; they influence donor kidney selection, interpretation of preoperative imaging and the technical difficulty of aortic and renal interventions.

Cerebral vascular anatomy displays similarly strong regional signatures. Classic angiographic and anatomical studies, reinforced by modern CTA work in large patient samples, have shown that circle of Willis completeness, hypoplastic segments and communicating artery dominance vary substantially between populations.^{6, 7} For neurosurgeons and stroke teams, these differences affect collateral flow expectations, aneurysm risk assessment and surgical or endovascular planning. A curriculum that presents a single textbook circle of Willis as 'normal' ignores both the data and the clinical implications.

CT-based studies of the paranasal sinuses have demonstrated marked interethnic and regional variation in ethmoid roof height, frontal sinus pneumatization, septal deviation and Onodi cell prevalence.⁴ Keros classification distributions differ significantly between cohorts; some populations show a predominance of taller ethmoid roofs, inherently increasing anterior skull base risk during functional endoscopic sinus surgery (FESS).⁵

Despite this, many medical students are still taught a single ethmoid roof pattern and a generic 'danger area' concept that does not quantify how often high-risk configurations occur locally. When a population has a higher baseline proportion of deep olfactory fossae or complex frontal recess anatomy than the classical reference, these patterns should be treated as expected anatomy in teaching, not as rare variants only mentioned in passing.

Peripheral nerve trajectories also show population-dependent frequencies that have direct surgical implications. Sciatic nerve division level and its relationship to the piriformis muscle, for example, are commonly presented as a single 'typical' pattern with rare variants, yet cadaveric series from different regions report substantial differences in the proportion of high divisions and variant exit routes from the pelvis.⁸

Similar issues appear in brachial plexus morphology, where prefixed and postfixed arrangements vary between North American, Indian and African cohorts, altering expected root contributions to major terminal nerves. A curriculum that teaches only one arrangement as standard and relegates others to an exam footnote does not reflect the reality faced by surgeons performing plexus exploration, regional anaesthesia or reconstructive nerve surgery.

Musculoskeletal and cranial morphometry further illustrate the need for population-specific teaching. Foramen magnum dimensions in South Indian series, for example, differ significantly from values commonly quoted from European or North American datasets, with implications for craniovertebral junction decompression and implant sizing.⁹ These differences are not mere curiosities; they inform radiological thresholds for normality and affect the margin for error in instrumentation.

Textbook discussions of joint and limb morphometry, such as acetabular version, femoral neck–shaft angle and foot architecture, frequently rely on data from limited reference populations. More recent anatomical and surgical literature emphasises how these parameters vary between ethnic groups and across regions, influencing both degenerative patterns and optimal implant design.¹⁰ An educational model that ignores such diversity forces clinicians to 'unlearn' their undergraduate anatomy once they confront the range of real patient anatomy in practice.

Although fewer large-scale datasets exist compared with vascular or osseous structures, available evidence points to meaningful population-linked differences in airway anatomy, including epiglottis shape, laryngeal inlet dimensions and the relative alignment of oral, pharyngeal and laryngeal axes. These factors can influence the grade of direct laryngoscopy, the need for video-assisted devices and the choice of blade curvature or size.

Teaching a single generic airway configuration as 'normal' neglects both the anatomical variability and its consequences for difficult airway prediction. In regions where specific craniofacial or skeletal patterns are more prevalent, airway modules should explicitly integrate local morphometric trends rather than relying solely on imported illustrations and models.

Taken together, these data show that anatomical variation is not an occasional anomaly but a structured spectrum that often maps onto population, ancestry and geography.² Persisting with a single universal anatomy model is therefore not just pedagogically conservative; it is empirically wrong. When a configuration occurs in 30–40% of a given population, labelling it as a rare variant betrays a curriculum that has failed to update itself in line with existing evidence.³

The consequences of this educational lag are clearest in high-risk specialties. Surgeons are surprised by nerve courses or vascular patterns that should be expected from local data; radiologists overcall variants as pathology or under-recognise dangerous configurations; anaesthetists encounter difficult airways in patients whose craniofacial anatomy was never represented in teaching material. In each case, the problem is not the student’s ability, but the curriculum’s failure to match the anatomical reality of the patient population.

A modern anatomy curriculum should therefore combine global frameworks with population-specific content. Universal principles—such as standard planes, terminology and core organ relationships—remain essential.¹ However, modules on vascular branches, skull base landmarks, nerve pathways and morphometry should include side-by-side tables of global versus local prevalence, illustrated with regional CT, MRI and cadaveric images. This approach preserves portability for graduates who move between countries while still making their primary training contextually accurate.

Such a curriculum does not require exotic new resources. Many faculties already have access to local imaging archives and cadaveric material; the missing piece is deliberate integration of these data into teaching, assessments and learning outcomes. Population-specific anatomy should be framed not as an advanced topic for subspecialists, but as baseline knowledge for any doctor who intends to practice safely in a defined community.

This editorial is a narrative synthesis rather than a systematic review, and it inevitably reflects selection bias in the studies chosen to illustrate key points. Some populations remain under-represented in the anatomical literature, particularly in large imaging-based morphometric datasets, which limits the generalisability of specific numerical estimates.⁴ Heterogeneity in imaging protocols, cadaver demographics and inclusion criteria further complicates direct comparison between series.

In addition, many classical anatomical references predate modern population-level imaging and therefore do not provide the prevalence data now expected in meta-analytic work.¹ The arguments presented here rest on the convergence of multiple lines of evidence rather than on a single comprehensive dataset. Future work should focus on systematically mapping anatomical variation across more regions using standardised protocols, and on formally evaluating how population-specific curricula influence clinical outcomes.

The current evidence base leaves little justification for maintaining a rigid, universal anatomy curriculum disconnected from population-specific data. Vascular branching, sinus architecture, nerve trajectories, cranial morphometry and airway configuration all show predictable regional patterns that matter for clinical decision-making.^{3, 6}

Medical schools should move beyond the idea that there is one standard anatomy and instead teach a structured spectrum: global frameworks anchored by local prevalence and morphology. Integrating population-specific content into routine anatomy teaching is not an optional refinement; it is a necessary correction that aligns education with reality, supports safer practice and respects the anatomical diversity of the patients physicians are trained to serve.