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Extensor Chains

The extensor chain has the following functions:

• Global lordosis of the trunk

• Opening outward

• Communicating with the surroundings

Chaines d'extension_edited.jpg

 

It is composed of the following elements:

 

On the Trunk Deep Plane

• Autochthonous muscles

• Erector trunci

• Iliocostal part of the quadratus lumborum Median Plane

' Superior and inferior posterior serratus muscles

 

Connection to the Shoulder Blade

• Pars horizontalis and descendens of the trapezius

• Pectoralis minor

• Transverses thoracis

 

Hip Flexion

• Internal and external obturators

 

Knee Flexion

• Semimembranosus

 

Dorsal Extension of the Foot

• Extensor digitorum longus

 

Plantar Flexion of the Toes and Increase of the Foot Arch

• Quadratus plantae

• Flexor hallucis brevis

 

Connection to the Arm

• Latissimus dorsi

• Pectoralis major

 

Connexion to the upper extremity

The extensors of the upper extremity are the posterior muscles:

• Posterior part of the deltoideus

• Triceps brachii

• Hand and finger extensors

 

Connection to the Cervical Spine

• Splenius colli

• Spinotransversal paravertebral muscles

 

Connection to the Head

• Splenius capitis

• Pars ascendens of the trapezius

 

Connection to the Lower Extremity

• Gluteus maximus

 

 

Ilium Rotation Forward

• Quadratus lumborum

• Rectus femoris

 

Hip Extension

• Gluteus maximus

• Quadratus femoris

 

Knee Extension

• Vastus intermedius of the quadriceps

• Plantar flexion of the foot

 

Extension of the Forefoot

• Flexor digitorum brevis

 

Extension of the Toes

• Interossei muscles

• Extensor digitorum brevis

• Extensor hallucis brevis

 

 

 

 

 

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