Test your knowledge of anatomy by labeling the diagram presented here in the shortest amount of time and with the fewest errors. Then score your performance. The scoring system takes into account both the time needed to complete the quiz, and the number of tries you need to do so.

This animation presents the structure and the ultrastructure (also called the “fine structure”) of the neuromuscular junction. Microphotographs enable one to relate the schematic diagrams to the real structures.

The majority of synapses are junctions between neurons. A motor end plate lies at the synaptic extremity of a neuromuscular junction. The axon of the motor neuron is connected to a muscle fiber, where it controls the excitation of that fiber.

This animation presents the molecular mechanisms of muscle contraction.

This animation presents muscle contraction at the level of the sarcomere by providing an animated schematic diagram in parallel with corresponding electron micrographs taken using a transmission electron microscope (TEM).
Photos:  © James E. DENNIS - PHOTOTAKE - ISM.

This animation presents the structure and the ultrastructure of skeletal muscle in order to help better understand muscle contraction.

This simplified presentation of the anatomy of an arm illustrates the action of antagonistic muscle pair. ‘Click’ on a muscle to activate  it.