PLC Knee Injury. The Posterolateral Complex (PLC) refers to a group of ligaments and tendons that run on the outside of the knee. The PLC is composed of the fibular collateral ligament (FCL), the popliteofibular ligament (PFL), and the tendon of the popliteus muscle. Together these three structures provide stability to the knee with side to side motion and during rotational movements.
The development of the neuromuscular junction requires signaling from both the motor neuron's terminal and the muscle cell's central region. During development, muscle cells produce acetylcholine receptors (AChRs) and express them in the central regions in a process called prepatterning.he neuromuscular junction is the site of the signal exchange. The steps of this process in vertebrates occur as follows:(`) The action potential reaches the axon terminal. (2) Voltage-dependent calcium gates open, allowing calcium to enter the axon terminal.
When an action potential reaches the end of a neuron, the acetylcholine is released and a new action potential begins in the muscle tissue. Nerves connecting to muscles are called motor neurons. Each neuromuscular junction is connected to a bundle of muscle fibers. A motor neuron may branch several times and connect to several bundles. All of these bundles will contract together upon getting a signal from the motor neuron. View the animation below, then complete the quiz to test your knowledge of the concept.