Bone Identifier

Identify bones by region, shape, and landmarks. Learn bone markings, articulations, and clinical significance of each skeletal element.

Finder

Classification
Articulations
Key Landmarks
Description
Clinical

Select a body region to explore its bones and skeletal landmarks.

Covers 50+ major bones across 7 body regions.

How to Use

  1. 1
    Select the bone or skeletal region

    Choose a specific bone by name or browse by skeletal region (axial skeleton: skull, vertebral column, thoracic cage; appendicular skeleton: pectoral girdle, upper limb, pelvic girdle, lower limb) to access the full TA2 osteological catalogue.

  2. 2
    Explore surfaces, borders, and features

    Review the named surfaces, borders, foramina, processes, tuberosities, and articular facets of the selected bone, each described using standardized TA2 osteological nomenclature and linked to the muscles, ligaments, and neurovascular structures that attach or pass through them.

  3. 3
    Review clinical correlates and fracture patterns

    Access fracture classification systems (AO/OTA for long bones, Neer for proximal humerus, Garden for femoral neck), common fracture sites, imaging characteristics on X-ray and CT, and the neurovascular structures at risk in each fracture pattern.

About

The skeletal system provides the structural framework for the human body, protecting vital organs, enabling locomotion through articulations with muscles and joints, and serving as the primary reservoir for calcium and phosphate homeostasis. The 206 bones of the adult skeleton are catalogued in Terminologia Anatomica 2nd edition with precise names for every surface, border, foramen, process, and articular facet — osteological landmarks that serve as attachment points for muscles and ligaments, and as reference points for surgical approaches and fracture description.

The Bone Identifier provides comprehensive access to this osteological catalogue, organized by skeletal region and individual bone. Each bone entry presents its morphological features using TA2 nomenclature alongside clinical correlations: the attachment sites for muscles (cross-linked to the Muscle Origin-Insertion tool), the foramina transmitting neurovascular structures at risk in fractures, and the ossification timeline relevant to pediatric and forensic applications. Fracture classification systems — AO/OTA for long bones, Neer for proximal humerus, Garden for femoral neck, Denis for thoracolumbar spine — are integrated to bridge basic science and clinical surgical practice.

For radiologists and orthopedic surgeons, the imaging correlation features link osteological landmark descriptions to their appearances on plain radiography, computed tomography, and magnetic resonance imaging. The tool references imaging anatomy atlases and orthopedic surgery planning resources, including the Müller AO Classification of Fractures and the Comprehensive Classification of Fractures of Long Bones, ensuring that anatomical nomenclature aligns with the language used in clinical documentation, operative reports, and peer-reviewed orthopedic literature.

FAQ

How many bones does the adult human skeleton contain?
The adult human skeleton typically contains 206 bones, though this number varies between individuals due to the presence of sesamoid bones (beyond the two patellae), sutural (Wormian) bones in the skull, and occasional accessory ossification centers that fail to fuse. At birth, the skeleton consists of approximately 270 cartilaginous and bony elements that consolidate through ossification and fusion over the first 25 years of life. Terminologia Anatomica 2nd edition names all 206 standard bones plus common variants, providing a complete cataloguing framework for both normal and variant skeletal anatomy.
What is the AO/OTA fracture classification system?
The AO/OTA (AO Foundation / Orthopaedic Trauma Association) fracture classification system provides a standardized alphanumeric coding scheme for fractures of every bone in the body. Each code specifies the bone segment (e.g., 12 for proximal tibia), the fracture morphology (A = simple, B = wedge, C = complex), and the degree of comminution and displacement. This system is used in trauma registries, research publications, and surgical planning internationally. The Bone Identifier tool maps fracture sites to their AO/OTA codes to support interpretation of operative reports and research literature.
How are ossification centers and growth plates described?
Each long bone entry includes the primary ossification center (present in the diaphysis by the 8th fetal week for most limb bones) and secondary ossification centers that form at the epiphyses postnatally. The timing of epiphyseal fusion (ranging from the distal femoral epiphysis fusing around age 14–16 in females to the medial clavicular epiphysis fusing last at around age 25) is provided with ranges derived from standard orthopedic and forensic anthropology references. This data is essential for pediatric orthopedics, growth plate injury classification (Salter-Harris system), and forensic age estimation.
Are bone density and trabecular architecture covered?
The tool provides qualitative descriptions of trabecular architecture for clinically important bones, including the Ward triangle and Singh index for proximal femur density, and the trabeculae of the calcaneus aligned along stress lines identified by DeLee and colleagues. Quantitative bone density data (T-scores, Z-scores) are not provided as these require dual-energy X-ray absorptiometry (DXA) measurements, but the anatomical context for interpreting DXA scan results — including the standard measurement sites at the lumbar spine (L1–L4), femoral neck, and total hip — is explained with reference to International Society for Clinical Densitometry (ISCD) guidelines.
Can I look up bone anatomy relevant to joint replacement surgery?
Yes — the tool includes arthroplasty-relevant anatomy for the major joints: proximal femur geometry relevant to total hip arthroplasty (femoral neck-shaft angle, anteversion angle, calcar anatomy), distal femur and proximal tibia anatomy for total knee arthroplasty, glenoid morphology for shoulder arthroplasty, and acetabular anatomy for cup positioning. Reference ranges for normal joint geometry are provided from large-scale radiological studies, supporting the pre-operative planning process described in orthopedic surgery textbooks such as Campbell's Operative Orthopaedics.

Educational Disclaimer

This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical decisions.

Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.