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Extension is the opposite of flexion, a straightening movement that increases the angle between body parts. [12] For example, when standing up, the knees are extended. When a joint can move forward and backward, such as the neck and trunk, extension is movement in the posterior direction. [ 10 ]
In anatomy, extension is a movement of a joint that increases the angle between two bones or body surfaces at a joint. Extension usually results in straightening of the bones or body surfaces involved. For example, extension is produced by extending the flexed (bent) elbow. Straightening of the arm would require extension at the elbow joint.
The extension synergy for the lower extremity includes hip extension, adduction and internal rotation, knee extension, ankle plantar flexion and inversion, and toe plantar flexion. [ 1 ] Note that some muscles are not usually involved in these synergy patterns and include the lattisimus dorsi , teres major , serratus anterior , finger extensors ...
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cephalad movement of navel on cervical flexion Bekhterev–Jacobsohn reflex: Vladimir Bekhterev, Louis Jacobsohn-Lask: neurology: pyramidal tract lesions: stroking dorsal radial skin, with forearm in supination, elicits wrist and finger flexion Bekhterev–Mendel reflex: Vladimir Bekhterev, Kurt Mendel: neurology: pyramidal tract lesions
For example, an extension of the lower arm is performed by the triceps as the agonist and the biceps as the antagonist (which contraction will perform flexion over the same joint). Muscles that work together to perform the same action are called synergists .
The McKenzie protocol also now includes flexion protocols and stresses the importance of differentiating whether flexion or extension improves patient's symptoms. As a result, McKenzie principles are used by many physical therapists in the treatment of low back pain, whereas Williams Exercises are no longer taught as a physical therapy protocol.
The only movements permitted in the joints of the digits are flexion and extension; these movements are more extensive between the first and second phalanges than between the second and third. The flexor hallucis longus and flexor digitorum longus flex the interphalangeal joint of the big toe and lateral four toes, respectively.