Appoggio and muscle chains

Extensor Chains
The extensor chain has the following functions:
• Global lordosis of the trunk
• Opening outward
• Communicating with the surroundings

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