The Movement of Muscles

Muscle	Origin	Insertion	Movement
pectoralis major https://www.youtube.com/watch?v=8bQH4fQwMSo	Clavicular head-medial half clavicle. Sternocostal head-lateral manubrium and sternum, six upper costal cartilages and external oblique aponeurosis.	Lateral lip of bicipital groove of humerus and anterior lip of deltoid tuberosity.	Clavicular head:flexes and adducts arm. Sternal head: adducts and medially rotates arm . Accessory for inspiration.
latissimus dorsi https://www.youtube.com/watch?v=wzyB34izUNI	Spine T7, spinous processes and supraspinous ligaments of all lower thoracic, lumbar and sacral vertebrae, lumbar fascia, posterior third iliac crest, last four ribs (interdigitating with external oblique abdominis) and inferior angle of scapula.	Floor of bicipital groove of humerus after spiraling around teres major.	Extends, adducts and medially rotates arm. Costal attachment helps with deep inspiration and forced expiration.
gluteus maximus https://www.youtube.com/watch?v=OH7jowteXSs	Outer surface of ilium behind posterior gluteal line and posterior third of iliac crest lumbar fascia, lateral mass of sacrum, sacrotuberous ligament and coccyx.	Deepest quarter into gluteal tuberosity of femur, remaining three quarters into iliotibial tract (anterior surface of lateral condyle of tibia.)	Extends and laterally rotates hip. Maintains knee extended via iliotibial tract.
vastus lateralis https://www.youtube.com/watch?v=bYkXYOl96Iw	Upper intertrochanteric line, base of greater trochanter, lateral linea aspera, lateral supracondylar ridge and lateral inter muscular septum.	Lateral quadriceps tendon to patella, via ligamentum patellae into tubercle of tibia.	Extends knee.
biceps brachii https://www.youtube.com/watch?v=eLuZ6lKa6p4	posterior border of bicipital tuberosity of radius (over bursa) and bicipital aponeurosis to deep fascia and subcutaneous ulna.	Supinates forearm, flexes elbow, weakly flexes shoulder.
triceps brachii https://www.youtube.com/watch?v=GkO5MAx-w00	Long head: infraglenoid tubercle of scapula. lateral head: upper half posterior humerus (linear origin). medial head: lies deep on lower half posterior humerus inferomedial to spiral groove and both inter muscular septa.	Posterior part of upper surface of olecranon process of ulna and posterior capsule.	Extends elbow. Long head stabilizes shoulder joint. medial head retracts capsule of elbow joint on extension.
deltoid https://www.youtube.com/watch?v=hsMEIyzbob4	Lateral third of clavicle, acromion, spine of scapula to deltoid tubercle.	Middle of lateral surface of humerus (deltoid tuberosity.)	Abducts arm, anterior fibers flex and medial rotate, posterior fibers extend and lateral rotate.
external obliques https://www.youtube.com/watch?v=eWAxbQ62JD0	Anterior angles of lower eight ribs.	Outer anterior half of iliac crest, inguinal lig, public tubercle and crest, and aponeurosis of anterior rectus sheath.	Supports abdominal wall, assists forced expiration, aids raising intraabdominal pressure and, with muscles of opposite side, abducts and rotates trunk
intercostal muscles https://www.youtube.com/watch?v=0Fw5ibdD6d4	Inferior border of ribs as far back as posterior angles.	Superior border of ribs below, passing obliquely downwards and backwards.	Fix intercostal spaces during respiration. Aids forced inspiration by elevating ribs.
tibialis anterior https://www.youtube.com/watch?v=crxG22quZus	Upper half of lateral shaft of tibia and interosseous membrane.	Inferomedial aspect of medial cuneiform and base of 1st metatarsal.	Extends and inverts foot at ankle. Holds up medial longitudinal arch of foot.
sartorius https://www.youtube.com/watch?v=CA9_gxWHUoI	Immediately below anterior superior iliac spine.	Upper medial surface of shaft of tibia.	Flexes, abducts, laterally rotates thigh at hip. Flexes, medially rotates leg at knee.
semitendinosis https://www.youtube.com/watch?v=BvEKpRUGU3A	Upper inner quadrant of posterior surface of ischial tuberosity.	Upper medial shaft of tibia below gracilis.	Flexes and medially rotates knee. Extends hip.