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A flexor muscle is a skeletal muscle whose contraction bends a joint, decreasing the angle between components of a limb, such as bending the knee or elbow. This action is known as flexion.

The type of muscle that has the opposite effect is the extensor muscle, which opens a joint, increasing the angle between components. Some of the flexor muscles of the upper limbs are the brachialis and the biceps. Other types of muscles include: abductors, adductors, supinators and rotators. In humans, some muscles include 'flexor' in their name. Some examples are:

• Flexor carpi radialis
• Flexor carpi ulnaris
• Flexor digitorum profundus muscle

Sources: [1]

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v • d • e Joints (TA A03.0, GA 3.284) Types fibrous: Gomphosis · Suture · Syndesmosis · Interosseous membrane cartilaginous: Synchondrosis · Symphysis synovial: Plane joint · 1° (Hinge joint, Pivot joint) · 2° (Condyloid joint, Saddle joint) · 3° (Ball and socket joint) by range of motion: Synarthrosis · Amphiarthrosis · Diarthrosis Terminology Kinesiology · Anatomical terms of motion · Agonist/Antagonist Motions general: Flexion/Extension · Adduction/Abduction · Internal rotation/External rotation · Elevation/Depression specialized/upper limbs: Protraction/Retraction · Supination/Pronation specialized/lower limbs: Plantarflexion/Dorsiflexion · Eversion/Inversion Components capsular: Articular capsule (Synovial membrane, Fibrous membrane) · Synovial fluid · Synovial bursa · Articular disk/Meniscus extracapsular: Ligament · Enthesis joint navs: anat, non-congenital arthropathies/deformities/dorsopathies/soft tissue arthropathy/congenital, eponymous signs, proc