Muscle: Origin, Insertion, Action

Temporalis

Origin: Temporal fossa 

Insertion: coronoid process 

Action: Elevates/retract the mandible 

Sternocleidomastoid

Origin:Superior, anterior manubrium; Medial clavicle 

Insertion: Mastoid process and Lateral part of the superior nuchal line

Action: Bend the neck forward; tilt the head; rotate the head

Rectus Abdominus

Origin: Pubis

Insertion: Xiphoid process and Costal cartilage

Action: Flexion of the trunk, breathing

Latissimus Dorsi

Origin: Spinous process of T7-12, posterior iliac crest, ribs 9-12, inferior angle of the scapula

Insertion: Intertubercular groove 

Action: Arm adduction, internal rotation 

Pectoralis major

Origin: Anterior, medial clavicle; sternum and costal cartilage 1-6

Insertion: Intertubercular groove

Action: Arm adduction, internal rotation 

Iloapsoas

Origin: iliac crest, transverse processes of L1-L5

Insertion: Greater trochanter of the femur

Action: Flexion of the thigh

Deltoid

Origin: Lateral clavicle, acromion process, spine of the scapula

Insertion: Deltoid tuberosity of the humerus 

Action: Arm adduction

Biceps brachii

Origin: Coracoid process of the scapula, supraglenoid tubercle

Insertion: Radial tuberosity 

Action: Flexion and supination of the forearm 

Triceps brachii

Origin: Infraglenoid tubercle, posterior humerus

Insertion: Olecranon process of the ulna

Action: Extension and adduction of the forearm

Extensor digitorum

Origin: Lateral epicondyle of the humerus

Insertion: Digits 2-5 

Action: Finger extension (2-5)

Flexor digitorum superficialis

Origin: Medial epicondyle of the humerus

Insertion: Middle phalanges 2-5

Action: Flexion of the fingers 

Gluteus maximus

Origin: Lateral posterior surface of the sacrum and coccyx, posterior ilium

Insertion: Gluteal tuberosity of the femur

Action: Thigh extension, external rotation 

Rectus femoris

Origin: Anterior inferior iliac spine

Insertion: Tibial tuberosity

Action: Thigh flexion, leg extension

Biceps femoris

Origin: Ischial tuberosity

Insertion: Lateral head of the fibula

Action: Thigh extension, thigh external rotation, leg flexion, leg external rotation

Gastrocnemius

Origin: Upper posterior medial and lateral condyle of the femur

Insertion: Posterior calcaneus

Action: Plantar flexion

Tibialis anterior

Origin: Lateral surface of the tibia

Insertion: Medial cuneiform, base of metatarsal 1

Action: Foot dorsiflexion, inversion

Supraspinatus

Origin: Supraspinous fossa

Insertion: Greater tubercle of the humerus

Action: Abduction of the arm

Infraspinatus

Origin: Infraspinous fossa

Insertion: Greater tubercle of the humerus

Action: Arm external rotation

Teres minor

Origin: Lateral border of the scapula

Insertion: Greater tubercle of the humerus

Action: Arm external rotation, adduction

Subscapularis

Origin: Subscapular fossa

Insertion: Lesser tubercle of the humerus

Action: Arm internal rotation