Major Muscles & Actions

Iliopsoas

Flexes hip

Gluteus Medius

Abducts, stabilizes hip

Gluteus Maximus

Extends, externally rotates hip

tensor fasciae latae

Abducts, medially rotates hip

Semimembranosus

Extends hip, flexes knee

Semitendinosus

Extends hip, flexes knee

Biceps Femoris

Extends hip, flexes knee

Vastus Medialis

Extends knee

Rectus Femoris

Flexes hip, extends knee

Soleus

Plantarflexes ankle

Gastrocnemius

Plantarflexes ankle, flexes knee

Tibialis Anterior

Dorsiflexes, inverts foot

Levator Scapulae

Elevates scapula, neck lateral, flexion

Sternocleidomastoid

Flexes, rotates neck

Subscapularis

Medially rotates shoulder

Infraspinatus

Laterally rotates shoulder

Supraspinatus

Initiates shoulder abduction

Teres Minor

Assists lateral rotation

Teres Major

Shoulder extension, medial rotation

Pectoralis Minor

Stabilizes scapula. Scapular depression and protraction

Brachialis

Primary elbow flexor

Triceps Brachii

Extends elbow

Biceps Brachii

Flexes elbow, supinates forearm

Deltoid

Abducts shoulder

Pectoralis Major

Flexes, adducts, medially rotates shoulder

transversus abdominis

Compresses abdomen

Quadratus Lumborum

Lateral flexion of spine

Erector Spinae

Extends, stabilizes spine

Rhomboid Minor

Assists scapular retraction

Rhomboid Major

Retracts scapula

Serratus Anterior

Protracts, stabilizes scapula

Rectus Abdominis

Flexes spine

Trapezius

Elevates, retracts, rotates scapula

Latissimus Dorsi

Extends, adducts, medially rotates shoulder