Origin, Insertion, Action
Action: Plantar flexion
Gastrocnemius action
Insertion: Calcaneus
Gastrocnemius insertion
Origin: Femoral condyles
Gastrocnemius origin
Action: Extension and lateral rotation at hip
Gluteus maximus action
Insertion: Iliotibial (IT) band and gluteal tuberosity of femur
Gluteus maximus insertion
Origin: Posterior and lateral portions of ilium, sacrum, coccyx
Gluteus maximus origin
Action: Extension and adduction at shoulder
Latissimus dorsi action
Insertion: Intertubercular sulcus of humerus
Latissimus dorsi insertion
Origin: Spinous processes of inferior thoracic and all lumbar vertebrae, thoracolumbar fascia
Latissimus dorsi origin
Action: Elevates mandible/closes jaws
Masseter action
Insertion: mandibular ramus
Masseter insertion
Origin: Zygomatic arch
Masseter origin
Action: Flexion and adduction at shoulder
Pectoralis major action
Insertion: Greater tubercle and intertubercular sulcus of humerus
Pectoralis major insertion
Origin: Sternum and clavicle
Pectoralis major origin
Action: Flexes spine; assists with exhalation
Rectus abdominis action
Insertion: Lower ribs and xiphoid process
Rectus abdominis insertion
Origin: Pubic bones
Rectus abdominis origin
Action: Extension at knee; flexion at hip
Rectus femoris action
Insertion: Tibial tuberosity via patellar ligament
Rectus femoris insertion
Origin: Anterior inferior iliac spine
Rectus femoris origin
Action: Dorsiflexion at the ankle
Tibialis anterior action
Insertion: First metatarsal bone and medial cuneiform bone
Tibialis anterior insertion
Origin: Lateral condyle of Tibia
Tibialis anterior origin
Action: Stabilize and move the scapula; extend neck
Trapezius action
Insertion: Clavicle and acromion and spine of scapula
Trapezius insertion
Origin: External occipital protuberance and spinous processes of cervical and thoracic vertebrae
Trapezius origin
Action: Extension at elbow
Triceps brachii action
Insertion: Olecranon of Ulna
Triceps brachii insertion
Origin: Lateral head: posterior and proximal region of humerus Long head: inferior border of glenoid cavity Medial head: Posterior region of humerus
Triceps brachii origin
Action: Flexion of elbow; supination
biceps brachii action
Insertion: Radial tuberosity
biceps brachii insertion
Origin: Long head: superior border of gelenoid cavity Short head: coracoid process
biceps brachii origin
Action: Flexion at the knee; extension at the hip
biceps femoris action
Insertion: Head of fibula; lateral condyle of tibia
biceps femoris insertion
Origin: Long head: Ischial tuberosity Short head: Linea aspera
biceps femoris origin
Action: Abduction at shoulder
deltoid action
Insertion: Deltoid tuberosity of humerus
deltoid insertion
Origin: Clavicle and acromion/spine of scapula
deltoid origin
Action: Expands thoracic cavity for inhalation
diaphragm action
Insertion: Central tendon of the diaphragm
diaphragm insertion
Origin: Xiphoid process, lower ribs, and anterior surfaces of lumbar vertebrae
diaphragm origin
