A series of four schematic anatomical diagrams (A-D) illustrating dermatomal distributions of pain and numbness on human figures. Panels A (anterior) and B (posterior) show preoperative cervical radiculopathy symptoms, with yellow shading indicating persistent pain in the neck (C2-C3), bilateral upper chest (C4-T4), left shoulder, and left subscapular area. Gray shading on the left upper extremity represents numbness involving the arm and all digits (C6-C8 distribution). Panels C (anterior) and D (posterior) illustrate postoperative symptoms following cervical surgery. A red shaded area on the left anterior chest (spanning approximately C3-T4 dermatomes) represents the location of angina pectoris pain. The diagrams use standard dermatome labeling (C2-S5) to map clinical sensory manifestations. This medical illustration is used to differentiate between cervical referred pain and cardiac-origin chest pain in a clinical context, highlighting the importance of sensory mapping in differential diagnosis.

Clinical photographs demonstrating physical examination maneuvers for cervical radiculopathy. Panel A illustrates the forward flexion test, showing a patient with the head rotated to the side and the neck flexed anteriorly. Panel B demonstrates the Spurling test (foraminal compression test), where an examiner applies a downward axial load to the apex of the patient's head while the neck is rotated toward the symptomatic side. These provocative maneuvers are used to evaluate cervical nerve root irritation or impingement; a positive result is indicated by the reproduction of radicular pain radiating into the shoulder or arm. The images show a clinical setting with the patient in a seated position. These tests are essential components of a neurological neck examination to differentiate cervical spine pathology from shoulder-related disorders.

Summary : This figure illustrates the dermatomal distribution patterns of the C4, C5, C6, and C7 spinal nerves on the human body, showing the specific skin areas innervated by each nerve root. illustration: # Overview : • Four schematic diagrams of the human upper body (front and back views) are shown, each labeled with a different cervical spinal nerve (C4, C5, C6, C7). • Each diagram highlights a distinct region of the skin corresponding to the sensory distribution (dermatome) of the respective nerve. # Dermatome Regions : • C4: – Shaded area covers the lower neck, upper shoulder, and extends over the clavicle region. • C5: – Shaded area includes the lateral (outer) aspect of the upper arm and shoulder, extending down to just above the elbow. • C6: – Shaded area runs from the lateral neck and shoulder, down the lateral arm and forearm, to include the thumb. • C7: – Shaded area extends from the posterior neck and shoulder, down the posterior arm and forearm, to include the middle finger. # Design Encodings : • Black shading is used to indicate the dermatome for each nerve root on a simplified human outline. • Each diagram is labeled in the upper left or right with the corresponding nerve root (C4, C5, C6, C7). # Spatial Relationships : • The diagrams are arranged in a 2x2 grid, with C4 and C5 on the top row, C7 and C6 on the bottom row. • Each dermatome is shown on one side of the body for clarity. # Analysis : • The figure visually distinguishes the unique, non-overlapping cutaneous territories supplied by each cervical nerve root. • The C4 dermatome is most superior and medial, while C7 is more posterior and extends to the middle finger. • The C6 dermatome uniquely includes the thumb, and C5 is limited to the upper lateral arm. • This layout aids in clinical localization of nerve root pathology based on sensory symptoms.

This clinical photograph displays an intraoperative view of an open surgical procedure on the medial aspect of the elbow, specifically illustrating a subcutaneous transposition of the ulnar nerve for the treatment of cubital tunnel syndrome. The incision reveals several anatomical layers, including skin, a thick layer of yellowish lobular subcutaneous fat, and underlying muscle fascia. The ulnar nerve is clearly identified as a slender, yellowish-white cord-like structure that has been mobilized from its native position in the cubital tunnel. It is being retracted and supported by yellow vessel loops and a metal rake retractor. The surgical field also shows deep venous structures and dissected muscular tissue with visible striations. The procedure demonstrates the transposition technique where the nerve is relocated anteriorly to the medial epicondyle to relieve compression and tension during elbow flexion. This image serves as a teaching tool for orthopedic and neurosurgical trainees to understand the surgical anatomy and topographical shifts involved in peripheral nerve decompression.

This diagnostic image consists of two side-by-side X-rays of the elbow in a specialized cubital tunnel view (anteroposterior view with full flexion and 20 degrees of external rotation). The radiographs compare pre-operative (preop) and post-operative (postop) anatomy following a minimal medial epicondylectomy and in situ decompression for cubital tunnel syndrome. The images are annotated with cyan lines to measure the Cubital Tunnel Angle (CTA) and a purple line to indicate the Cubital Tunnel Depth (CTD). In the 'preop' image, the CTA is narrower and the CTD is deeper, illustrating the bony constriction that can lead to ulnar nerve irritation. In the 'postop' image, following the partial removal of the medial epicondyle, the cyan lines demonstrate a significantly widened angle and a shallower depth. This comparison serves as an educational tool to visualize the surgical objective of increasing the volume of the cubital tunnel to relieve ulnar nerve entrapment.

A clinical photograph presenting a lateral view of a patient’s head and neck, demonstrating Dropped Head Syndrome (DHS) with characteristic forward head posture. The image shows the head positioned anteriorly relative to the torso, with a marked forward inclination of the cervical spine. A blue arrow points to a distinct, abnormal bulge in the posterior neck region, corresponding to the trapezius and levator scapulae muscles. This visible hypertrophy or prominence indicates compensatory muscle strain or underlying musculoskeletal pathology associated with impaired cervical extension. The photograph was captured during the follow-up phase of athletic rehabilitation-based physical therapy (AR-PT), illustrating persistent muscle tonus despite symptomatic improvement. This visual serves as an educational example of postural deformity, sagittal imbalance, and compensatory myofascial changes in cervical spinal disorders.

This Comparison Chart uses a conceptual analogy to illustrate the biomechanics of cervical spine posture. The image is divided into two sections: (a) representing correct alignment and (b) representing incorrect alignment or Forward Head Posture (FHP). In section (a), an anatomical diagram of the skull shows it balanced directly over the cervical vertebrae with a natural 'C-shaped' lordotic curve. This is paralleled by an illustration of an arm holding a weighted ball, where a red line indicates a curved, efficient support alignment through the wrist. In section (b), the skull is displaced anteriorly (forward), causing a straightened or reversed cervical curve and increased mechanical stress. The corresponding arm illustration shows the hand and ball shifted forward, resulting in an angled red line that demonstrates the increased moment and tension required by the wrist and forearm muscles to support the weight. The educational focus is on the clinical significance of head displacement and its relationship to neck strain and musculoskeletal tension.