Muscle Action
Raises eyebrows
Frontalis
Origin: scapular spine and acromion, clavicle
Deltoideus
Insertion: proximal radius at radial tuberosity
Biceps brachii
Elevates upper lip
zygomaticus minor
Latissimus Dorsi
Adduction, extension and medial rotation of arm
The smile muscle
Zygomaticus major
Origin: ilium, anterior inferior iliac spine
Rectus Femoris
Insertion: angles of the ribs, vertebrae, posterior skull
Erector Spinae
Plantar flexion and eversion of the foot
Fibularis Longus
Retraction of scapula; as in pulling the shoulder blades together
Rhomboideus Major
Adduction, extension and medial rotation of arm
Latissimus Dorsi
Origin: frontal bone and maxilla
Orbicularis Oculi
Insertion: proximal ulna
Brachialis
brachioradialis
Flexes the elbow
rectus femoris
Extends lower leg; straightens knee
Abducts the arm
Deltoideus
Origin: ribs 2-5
Pectoralis Major
Insertion: anterior iliac crest and abdominal aponeurosis
external obliques
Adduction of arm
Teres Major
Dorsiflexes and inverts the foot
Tibialis anterior
Flexes the elbow and supinates the forearm
Biceps brachii
Origin: occipital bone and all cervical and thoracic vertebrae
Trapezius
Insertion: proximal tibia below medial condyle
Sartorius
Levator Scapule
Elevates the scapula, as in shrugging the shoulders
Gastrocnemius
Plantar flexes the foot and flexes the knee