Muscle | Function | Origin | |
Buccinator | Retracts angle of mouth; flattens cheek | | |
Fronatalis- (occipitofronatlis) | Moves scalp; elevates eyebrows | | |
Masseter | Elevates and protracts mandible; involved in excursion | | |
Occipitalis | Elevation of Eyebrows | | |
Orbicularis oculi | closes eyelids | | |
Orbicularis oris | closes lips | | |
Platysma | Depresses lower lip; wrinkles skin of neck and upper chest | Deltoid & Pectoralis major | Mandible |
Sternocleidomastoid | "One Contracting alone:laterally flexes head and neck to same side and rotates the head and neck to opposite side
Both Contracting together:
flexes neck" | Manubrium & clavicle | Mastoid process |
Temporalis | Elevates and protracts mandible; involved in excursion | | |
Zygomaticus Major | Elevation of the corner of mouth (smile) | | |
Diaphragm | Inspiration; depresses floor of thorax | | |
External Intercostals | Inspiration; elevates ribs | | |
External Oblique | Flexes and rotates vertebral column; compresses abdomen; depresses thorax | | |
Internal Oblique | Flexes and rotates vertebral column; compresses abdomen; depresses thorax | | |
Pectoralis Major | Flexes shoulder; adducts and medially rotates arm; extends shoulder from flexed position | Clavicle | Humerus |
Pectoralis Minor | depresses scapula or elevates ribs | | |
Rectus abdominus | flexes and rotates vertebral column; compresses abdomen | | |
Serratus Anterior | Rotates and protracts scapulat; elevates ribs | | |
Transverse abdominus | Compresses abdomen | | |
Adductor Longus | Adducts and laterally rotates thigh; flexes hip | | |
Adductor Magnus | "Adductor part: adducts thigh & flexes hip Hamstring part: extends hip" | | |
Biceps Femoris | Flexes knee; laterally rotates leg; extends hip | Femur | Fibula |
Fibularis longus | Everts and plantar flexes foot | fibula | first metatarsal bone and cuniform |
Gastrocnemius | plantar flexes foot; flexes knee | Calcaneus | femur |
Gluteus maximus | extends hip; abducts and laterally rotates thigh | illium, sacrum and coccyx | femur |
Gluteus medius | abducts and medially rotates thigh;tilts pevis toward supported side | | |
Gracilis | Adduction of thigh; flexion of leg | | |
Iliopsoas | flexes hip | | |
Rectus Femoris | Extension of leg; flexion of thigh; Extensor digitorum longus | Anterior inferior iliac spine | tibial tuberosity |
Sartorius | flexes hip and knee; laterally rotates and abducts thight; medially rotates leg | Anterior Superior iliac spine | tibial tuberosity |
Semitendinosous | flexes knee; medially rotates leg; extends hip | | |
Semimembranosous | Flexes knee; medially rotates leg; tenses capsule of knee joint; extends hip | | |
Soleus | plantar flexes foot | | |
Tensor Fascia latae | Flexes Hip; Abducts and medially rotates thigh; stabilizes femor on tibia when standing | | |
Tibialis Anterior | Dorsiflexes and inverts foot | Tibia | Cuniform and first metatarsal bone |
Vastus intermedius | Extends knee | | |
Vastus Lateralis | Extends knee | | |
Vastus medialis | Extends knee | | |
Biceps Brachii* | Flexes shoulder and elbow; supinates forearm and hand | scapula | radial tuberosity |
Brachialis | Flexes elbow | Humerus | Ulna |
Brachioradialis | Flexes elbow | Humerus | Radius |
Deltoid | Flexes and extends shoulder; abducts, medially and laterally rotates arm | | |
Infraspinatus | Laterally rotates arm; holds head of humerus in place | Scapula | Humerus |
Latissimus Dorsi | Adducts and medially rotates arm; extends shoulder | | |
Palmaris Longus | Flexion of wrist (weak); Tense palmar aponeurosis | | |
Subscapularis | medially rotates arm; holds head of humerus in place | | |
Supraspinatus | Abducts arm; holds head of humerus in place | Supraspinous Fossa | Humerus |
Teres major | Extends shoulder; adducts and medially rotates arm | Scapula | Humerus |
Teres minor | Laterally rotates and adducts arm; holds head of humerus in place | | |
Trapazius | Elevates, depresses, retracts, rotates and fixes scapula; extends neck | | |
Triceps Brachii | Extension of forearm; extension of arm (long head) | Humerus | Ulna |