- Muscles of extension Upper limb Lower limb Hip Knee Toes
- See also
- References
{{Anatomical lists}}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. If the head is tilted all the way back, the neck is said to be extended. Muscles of extensionUpper limb- of arm at shoulder[1]
- Axilla and Shoulder
- Latissimus Dorsi
- Posterior Fibres of Deltoid
- Teres Major
- of forearm at elbow[2]
- Posterior compartment of the arm
- Triceps Brachii
- Anconeus
- of hand at wrist[3]
- Posterior compartment of the forearm
- Extensor carpi radialis longus
- Extensor carpi radialis brevis
- Extensor carpi ulnaris
- Extensor digitorum
- of phalanges, at all joints
- Posterior compartment of the forearm
- Extensor digitorum
- Extensor digiti minimi (little finger only)
- Extensor indicis (index finger only)
- of phalanges, at interphalangeal joints[4]
- Lumbricals of the hand
- Dorsal interossei of the hand
- Palmar interossei
- of thumb[5][6]
- Extensor pollicis brevis (proximal phalange)
- Extensor pollicis longus (distal phalange)
Lower limbHip- of thigh/femur at hip[7]
- Gluteus maximus
- Posterior compartment of thigh
- Biceps femoris
- Semitendinosus
- Semimembranosus
Knee- of leg at knee (L3-L4)[8]
- Quadriceps
- Rectus femoris muscle
- Vastus medialis
- Vastus lateralis
- Vastus intermedius
Toes- of toes[9][10]
- Extensor hallucis longus
- Extensor digitorum longus
- Extensor digitorum brevis
- Extensor hallucis brevis
See also{{Anatomy-terms}}References1. ^Shoulder Articulations 2. ^Elbow Articulations 3. ^Wrist Articulations 4. ^Finger Articulations 5. ^Thumb Articulations 6. ^Thumb Articulations 7. ^Hip Articulations 8. ^Knee Articulations 9. ^Foot Articulations 10. ^Foot Articulations
{{Joints}} 2 : Anatomical terms of motion|Extensors |