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Sternocleidomastoid

Prime mover of flexion & lateral rotation of the head

Scalenes

Elevates first two ribs
synergist of lateral flexion of vertebral column and inhalation

Erector spinae

Prime mover of neck and trunk extension & lateral flexion of vertebral column

Quadratus lumborum

Prime mover of trunk extension, lateral flexion of vertebral column & elevation of pelvis

Pectoralis major

Prime mover of shoulder flexion, adduction & medial rotation

Pectoralis minor

With ribs fixed, draws scapula forward and downward

Trapezius

Prime mover of neck extension & scapular sabilisation, elevation, retraction & rotation

Latissimus dorsi

Prime mover of shoulder extension, adduction & medial rotation
Synergist of trunk rotation and respiration

Deltoid

Prime mover of shoulder abduction, flexion, extension, medial & lateral rotation

Corachobrachialis

Prime mover of shoulder flexion & adduction

Supraspinatus

Initiates shoulder abduction

Infraspinatus

Prime mover of lateral shoulder rotation
Synergist of shoulder abduction

Teres minor

Prime mover of lateral shoulder rotation
Synergist of shoulder extension & abduction

Subscapularis

Prime mover of medial shoulder rotation

Biceps brachii

Prime mover of elbow flexion & forearm supination
Synergist of shoulder flexion

Brachioradialis

Synergist of elbow flexion & forearm supination

Triceps brachii

Prime mover of elbow extension
Synergist of shoulder extension

Diaphragm

Prime mover of inspiration; flattens on contraction

External intercostals

Pulls ribs toward on another to elevate rib cage (aids in inspiration)
Synergist of diaphragm

Internal intercostals

Draws ribs together and depress rib cage (aids in forced exhalation)
Antagonist to external intercostals

Rectus abdominus

Prime mover of trunk flexion
Synergist of rotation of lumbar region of vertebral column

External obliques

Prime mover of trunk rotation & lateral flexion
Synergist of trunk flexion & abdominal wall compression

Internal obliques

Prime mover of trunk rotation & lateral flexion
Synergist of trunk flexion & abdominal wall compression

Tranvsersus abdominus

Compresses abdominal contents (core)

Levator ani

Supports and maintains position of pelvic viscera, resists downwards action of coughs, vomiting and lifts anal canal after defecation

External anal sphincter

Constricts anus

Pectineus

Prime mover of hip adduction
Synergist of hip flexion & medial rotation

Ilio-psoas

Prime mover of hip flexion
Synergist of lateral flexion of vertebral column

Gluteus maximus

Prime mover of hip extension & lateral rotation

Gluteus medius

Prime mover of hip abduction & medial rotation

Rectus femoris

Prime mover of knee extension
Synergist of hip flexion

Vastus lateralis

Prime mover of knee stabilisation and flexion

Vastus medialis

Prime mover of knee extension

Vastus intermedius

Prime mover of knee extension

Sartorius

Synergist of hip flexion, abduction, & lateral rotation & knee flexion

Adductor longus

Prime mover of hip adduction
Synergist of hip flexion & medial rotation

Adductor magnus

Prime mover of hip adduction
Synergist of hip flexion, extension & medial rotation

Gracilis

Prime mover of hip adduction
Synergist of medial hip rotation & knee flexion

Biceps femoris

Prime mover of hip extension & knee flexion
Synergist of lateral hip rotation

Semimembranosus

Prime mover of hip extension & knee flexion
Synergist of medial hip rotation

Semitendinosus

Prime mover of hip extension & knee flexion
Synergist of medial hip rotation

Gastrocnemius

Prime mover of plantar flexion of the ankle
Synergist of knee flexion

Soleus

Prime mover of plantar flexion of the ankle

Tibialis anterior

Prime mover of dorsiflexion of the ankle

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