Biomed: Muscles

Buccinator

Buccinator

compresses cheek (sucking straw)

Orbicularis Oris

squeezes & protrudes lips (kissing)

Zygomaticus Major

draws mouth up (smiling)

Frontalis

raises eyebrows & wrinkles forehead

Orbicularis Oculi

squeezes eyes closed (squinting)

Platysma

lowers jaw & pulls lower lip down (frowning/opening mouth)

Trapezius

moves scapula/shoulders (shrugging/shoulder rolls)

Deltoid

flexion, medial rotation, & abduction of humerus at shoulder (moving arm)

Pectoralis Major

flexion, medial rotation, & adduction of humerus at shoulder (overhead motions)

Triceps Brachii

extends forearm at elbow

Biceps Brachii

flexes elbow & turns forearm (holding something)

Tibialis Anterior

dorsiflexion & inversion of ankle (flex foot)

Sternocleidomastoid

flexes neck (cocking neck to a side)

Rectus Abdominus

compresses abdomen & flexes vertebral column (crunches)

External Oblique

compresses abdomen & flexes vertebral column (side crunch)

Sartorius

flexes hip & knee, laterally rotating thigh (crossing legs)

Gluteus Maximus

extends hip & laterally rotates femur (going up stairs)

Gastrocnemius

knee flexion & plantar flexion of ankle (pointing foot)

Soleus

plantar flexion of ankle (pointing foot)

Rectus Femoris

extends knee & flexes hip (kicking)

Latissimus dorsi

extension, medial rotation, & adduction of humerus at shoulder (lat pull downs)

Temporalis

elevates mandible (closing mouth)

Psoas Major

flexes hip (lifting leg)

Internal Intercoastals

pulls ribcage down & pushes air out of lungs (speech)