The major flexors of the knee are the hamstrings, which include: biceps femoris, semitendinosus, and semimembranosus.
The major extensors of the knee are the quadriceps, which include: rectus femoris, vastus medialis, and vastus lateralis.
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The flexor muscles of the leg include the hamstrings and the iliopsoas, which help to bend the knee and bring the thigh towards the abdomen. The extensor muscles of the leg are primarily the quadriceps, which straighten the knee and help to lift the leg.
Gastrocnemius and soleus muscles are very strong flexors of the ankle joint. The tibialis anterior and peroneus longus, together, are extensors of the ankle joint.
The flexor digitorum profundus is a muscle in the forearm that flexes the fingers and holds the handle.The flexor carpi radialis and extensor carpi radialis longus allow you 'bend' the wrist as you turn the handle.
When bones attached to a muscle are connected by a flexible joint, contraction of the muscle moves the skeleton. The muscle is called a flexor if the centers of the connected bones are brought closer together when the muscle contracts, and the movement is called flexion. (Biceps)The muscle is called an extensor if the bones move away from each other when the muscle contracts, and the movement is called extension. (Triceps)
The muscles that produce extension of the finger joints and wrist are the extensor muscles. In the forearm, the specific extensor muscles responsible for extension of the fingers and wrist include the extensor digitorum and extensor carpi radialis muscles.
The Flexor and Extensor muscles controls this movements. In particular, a chicken or a fowl's Flexor and Extensor muscles are called Pectoralis major and Pectoralis minor, respectively.Hope that helped! :))
The trapezius muscle is an extensor muscle. It is responsible for extending and laterally flexing the neck, as well as retracting and elevating the scapula.