Radius is one of the two long bones of the forearm. It is an anatomy term referring to a bone and its associated joints and attachments. It sits on the thumb side of the forearm, from the elbow to the wrist. It is commonly referenced in orthopedic exams, imaging interpretation, and fracture care.

Humerus is the long bone of the upper arm. It is an anatomy term used to describe the skeletal link between the shoulder and the elbow. It forms key joints and serves as an attachment site for major muscles, tendons, and ligaments. In clinical practice, it is commonly referenced in trauma evaluation, shoulder/elbow assessment, and surgical planning.

Scapula is the shoulder blade, a flat triangular bone on the back of the chest wall. It is an anatomy term that describes a key part of the shoulder girdle. In clinical practice, Scapula is referenced in shoulder exams, trauma evaluation, and rehabilitation planning. It is also used to describe motion patterns (scapular mechanics) that affect arm function.

The Clavicle is the collarbone, a long bone that connects the upper limb to the trunk. It is an anatomy structure and a key component of the shoulder girdle. Clinicians reference the Clavicle in trauma evaluation, shoulder pain exams, and surgical planning. It is also used as a landmark for imaging, procedures, and neurovascular assessment.

The Coccyx is the small terminal bone at the bottom of the vertebral column, commonly called the “tailbone.” It is an anatomy structure made of fused (or partially fused) vertebral segments. In clinical practice, the Coccyx is referenced in evaluation of sitting pain, trauma, childbirth-related symptoms, and pelvic floor disorders. It is also a landmark for imaging interpretation, injections, and (less commonly) surgery.

Sacrum is a triangular bone at the base of the spine that forms the back wall of the pelvis. It is an anatomy term describing the fused lower vertebrae between the lumbar spine and coccyx. In clinical practice, Sacrum is referenced in trauma, spine and pelvic evaluation, and sacroiliac joint assessment. It is also important in neurologic localization because sacral nerve roots pass through it.

The Lumbar Spine is the lower portion of the spine between the thoracic spine and the sacrum. It is an anatomy term and a clinical region that includes vertebrae, discs, facet joints, ligaments, muscles, and nerves. It is commonly referenced when evaluating low back pain, radicular symptoms, gait changes, and functional limitation. It is also a key focus in orthopedic, sports medicine, neurosurgical, and rehabilitation practice.

The Thoracic Spine is the middle portion of the vertebral column between the neck and the low back. It is an anatomy concept made up of 12 vertebrae (T1–T12) that connect to the rib cage. It supports posture and protects the spinal cord while allowing controlled trunk motion. It is commonly referenced in musculoskeletal exams, spine imaging, trauma evaluation, and deformity care.

The Cervical Spine is the upper portion of the vertebral column in the neck. It is an anatomy concept that includes vertebrae, discs, joints, ligaments, muscles, and neural structures. It supports the head and protects the spinal cord while enabling neck motion. It is commonly referenced in orthopedic, sports medicine, emergency, neurology, and rehabilitation practice.

Spine refers to the vertebral column, the central bony axis of the trunk. It is an anatomy term that includes bones, discs, joints, ligaments, muscles, and neural elements. In clinical practice, Spine is used to describe the structure being examined, imaged, or treated in neck and back complaints. It is also a key framework for understanding posture, movement, and neurologic function.