A multi-panel medical graphic illustrating tendon anatomy, pathophysiology, and clinical management. Panel (A) provides an anatomical diagram of a healthy tendon, detailing the hierarchical structure from the whole tendon (mm scale) down to fascicles, fibers (µm), fibrils (nm), and collagen (pm). It shows parallel, organized collagen bundles and sparse, spindle-shaped tenocytes. Panel (B) is a comparison chart showing an injured tendon characterized by disorganization of the extracellular matrix (ECM), collagen denaturing, hypercellularity with rounded cell morphology, and increased presence of immune cells and vascular infiltration. Panel (C) contains a diagnostic ultrasound image of a fissured Achilles tendon in the longitudinal plane. Within a blue dashed box, a linear hypoechoic (dark) area represents the structural fissure, contrasting with the normal hyperechoic fibrillar pattern of a healthy tendon. An overlaid illustration shows a needle delivering a platelet-rich plasma (PRP) injection directly into the fissured site for regenerative therapy. Labels identify proximal and distal orientations, highlighting the clinical application of orthobiologics in managing tendinopathies.

This medical illustration presents two side-by-side axial diagrams of the lateral ankle, contrasting normal anatomy with peroneal tendon subluxation. Both frames detail the lateral malleolus with its characteristic trabecular bone pattern and smooth outer cortex. The left frame illustrates the normal anatomy of the superior peroneal tunnel, where the peroneal tendons (specifically the peroneus longus) are securely positioned in the retromalleolar groove behind the lateral malleolus, stabilized by an intact superior peroneal retinaculum (SPR). The right frame demonstrates a pathological subluxation/dislocation, showing the peroneal tendon displaced anteriorly over the lateral malleolus due to a failure or disruption of the SPR. This comparison serves as an educational tool for orthopedics and sports medicine, highlighting the biomechanical importance of the retinaculum in preventing tendon instability. The diagram is relevant for understanding acute ankle injuries, chronic tendon instability, and the rationale for surgical interventions like retinacular repair or groove deepening.

Anatomical diagram depicting the normal musculoskeletal structure of a human finger digit, specifically focusing on the flexor tendon and its pulley system. The illustration shows a tan-colored cylindrical phalangeal bone as the foundation. Overlaid on the bone and underlying tendon is a series of white, fibrous bands representing the annular (A) and cruciform (C) pulleys. The annular pulleys appear as dense, circular transverse bands (like the A1, A2, and A3 pulleys), while the cruciform pulleys are shown as thinner, crisscrossing diagonal bands that allow for flexibility during finger flexion. A smooth, glistening tendon is visible beneath these ligamentous sheaths. The diagram illustrates the osteofibrous canal, which serves to keep the flexor tendons closely apposed to the bone, preventing 'bowstringing' and facilitating efficient mechanical finger movement. This visual is relevant for understanding hand anatomy, tenosynovitis pathology, and surgical or acupotomy interventions for trigger finger.

This composite educational illustration demonstrates the bio-inspired design of a Tendon-Mimic (TM) pattern based on equine superficial digital flexor tendon (SDFT) anatomy. The image is divided into three sections: 1) A cross-sectional grayscale stereo-micrograph of a tendon specimen showing the internal hierarchical arrangement of fascicles. 2) A diagnostic line diagram illustrating the segmentation of the specimen into 24 distinct fascicle contours. A corresponding data table provides the cross-sectional area (CSA) in mm² for selected fiber bundles (contours 8, 13, and 22), noting a mean CSA of 0.27 mm². 3) Three colored schematics (Variations A, B, and C) showing different biomimetic fiber-to-matrix ratios for 3D printing applications: F33-M66 (red), F60-M40 (dark blue), and F50-M50 (cyan). The figure illustrates the translation of biological morphology into quantitative parameters for bioengineering and tissue-mimicking polymer research, specifically focusing on tendon fascicle distribution and cross-sectional morphology.

This medical illustration depicts the surgical technique and functional anatomy of a lower trapezius transfer for shoulder reconstruction. The main diagram shows a patient in a lateral decubitus position, demonstrating active external rotation of the arm. Anatomical highlights in red illustrate the lower fibers of the trapezius muscle being utilized as a tendon transfer to restore shoulder function, specifically targeting irreparable rotator cuff tears where external rotation is lost. The muscle is shown transitioning into a graft that extends toward the humerus. An inset at the top provides a detailed view of the surgical fixation method, illustrating a weave-style tendinous anastomosis (likely a Pulvertaft weave) secured with sutures to join the donor tendon to the recipient site. This procedure is indicated for patients with posterosuperior rotator cuff insufficiency, providing a biomechanical advantage for external rotation when the infraspinatus and teres minor are non-functional.

Historical anatomical diagram from Carl Toldt's 'Anatomischer Atlas' depicting a dissection of the human abdominal and pelvic cavity. The illustration focuses on the spatial relationships of the visceral organs and their peritoneal attachments. Key labeled structures include the spleen (Lien), shown as an oblong organ situated superior to the left colic flexure (Flexura coli sinistra) and adjacent to the jejunum. In the upper right quadrant (anatomical left), the left lobe of the liver (Lobus sinister hepatis), ligamentum teres, and gallbladder (Vesica fellea) are prominent. The gastrointestinal tract is shown with the duodenum, ileum, and cecum (Intestinum caecum). Extensive detail is provided on the mesentery and folds, including the Mesenterium commune, Mesocolon descendens, and Mesocolon sigmoideum. In the inferior pelvic region, the ovary (Ovarium) is visible. This diagram illustrates the complex organization of the peritoneum and the fixation of various abdominal organs, which is of historical and educational significance for understanding surgical anatomy and conditions such as 'wandering spleen' (splenoptosis).