Extension (kinesiology)

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Anatomical planes in a human. Extension usually occurs in the coronal plane when the body is in the anatomical position

The leg extension is an isolation exercise.

Extension is a movement of a joint. For example, extension is produced by extending the flexed elbow. The arm is now straight; it has been extended. If the head is tilted all the way back, it is said to be extended.

The movement in the opposite directions is called flexion. Flexion decreases the angle between the bones of the limb at a joint, while extension increases it.

With the foot, extension (elevation) is usually called dorsiflexion.

If a part of the body is overstretched, then one speaks of a hyperextension (as with the knee).

In some anatomical muscle names, particularly with muscles of the forearm and the Cnemis, the term occurs explicitly as the second word in the Latin spelling of the name (for example, Musculus extensor carpi ulnaris).

1 Muscles of extension
- 1.1 Upper limb
- 1.2 Lower limb
2 References
3 External links

[edit] Muscles of extension

[edit] Upper limb

of forearm at elbow^[1]
- Posterior compartment of the arm
  - Triceps
  - Anconeus

of hand at wrist^[2]
- Posterior compartment of the forearm

of phalanges, at all joints
- Posterior compartment of the forearm
  - Extensor digitorum
  - Extensor carpi ulnaris
  - Extensor digiti minimi (little finger only)
  - Extensor indicis (index finger only)

of phalanges, at interphalangeal joints^[3]

of thumb^[4]^[5]
- Extensor pollicis brevis (proximal phalange)
- Extensor pollicis longus (distal phalange)

[edit] Lower limb

of thigh/femur at hip^[6]
- Gluteus maximus
- Posterior compartment of thigh

of leg at knee (L3-L4)^[7]
- Quadriceps

of toes^[8]^[9]

[edit] References

[edit] External links

Extension at eMedicine Dictionary

Image:Skeleton woman back.jpg

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v • d • e Joints
Types of joints	Amphiarthrosis - Symphysis - Gomphosis - Synovial joint (Hinge joint, Pivot joint, Condyloid joint, Saddle joint, Ball and socket joint, Gliding joint)
Terminology	Kinesiology - Anatomical terms of motion - Agonist/Antagonist
Motions	Flexion/Extension - Adduction/Abduction - Internal rotation/External rotation - Supination/Pronation - Plantarflexion/Dorsiflexion - Eversion/Inversion - Elevation/Depression - Protraction/Retraction