Human Elbow Joint Teaching Model Key benefits Clarifies how biceps and triceps cooperate to produce flexion and extension at the elbow, helping students visualize muscle action in real time. Demonstrates origin and insertion of the biceps and triceps and how muscles crossing the elbow joint produce movement. Illustrates the lever effect created by rotation about the joint axis, providing a simple mechanical explanation of arm movement. Easy to operate on a tabletop base for clear, repeatable demonstrations during class or lab sessions. Core features Functional anatomy: Accurate placement of upper and lower muscle cords at fixed attachment points to represent origin and insertion relationships. Joint mechanics: The elbow and humerus positions are held relatively fixed so rotation around the joint axis produces a visible lever effect. Simple manipulation: Press the chassis bracket with one hand and move the model hand up and down with the other to observe contraction and relaxation of the biceps and triceps. Stable mounting: The skeleton model is fixed to a chassis bracket and installed on a base for steady demonstrations. Material: Constructed from polyvinyl chloride PVC with corrosion resistance and low odor for classroom use. Demonstration method Secure the model on a tabletop by pressing the chassis bracket with one hand. Use the other hand to move the model forearm up and down. Observe how the biceps shortens and the triceps lengthens during flexion, and how the roles reverse during extension. Note how the fixed humerus and elbow axis create a lever effect, making the mechanical basis of limb movement easy to understand. Practical applications Classroom demonstrations: Use during lectures to show the dynamic relationship between agonist and antagonist muscles when teaching skeletal muscle function. Laboratory training: Provide handson practice for students to identify origin and insertion points and to study joint mechanics. Exam preparation and selfstudy: Allow students to review motion patterns, muscle roles, and mechanical leverage outside of formal class time. What makes this model useful Direct, handson visualization of muscle coordination and joint mechanics improves student comprehension compared to static diagrams. Reproducible motion and fixed attachment points make it simple to repeat demonstrations and highlight specific teaching points. Tabletopready mounting keeps the model stable and accessible during group instruction. Notes on use Designed for teaching and demonstration of elbow joint mechanics and muscle relationships. Handles and movements are intended for educational manipulation only.