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Axial and Appendicular Muscle Functions and Attachments

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  • Function of the Sternocleidomastoid muscle

    Flexes the neck and rotates the head to the opposite side. Attaches from the sternum and clavicle to the mastoid process of the temporal bone.

  • Function of the Trapezius muscle

    Elevates, retracts, and rotates the scapula. Attaches from the occipital bone and vertebrae to the clavicle and scapula.

  • Function of the Deltoid muscle

    Abducts the arm at the shoulder. Attaches from the clavicle and scapula to the deltoid tuberosity of the humerus.

  • Function of the Pectoralis Major muscle

    Adducts and medially rotates the arm. Attaches from the clavicle, sternum, and ribs to the greater tubercle of the humerus.

  • Function of the Latissimus Dorsi muscle

    Extends, adducts, and medially rotates the arm. Attaches from the lower vertebrae and iliac crest to the intertubercular groove of the humerus.

  • Function of the Biceps Brachii muscle

    Flexes the elbow and supinates the forearm. Attaches from the scapula to the radial tuberosity.

  • Function of the Triceps Brachii muscle

    Extends the elbow. Attaches from the scapula and humerus to the olecranon of the ulna.

  • Forearm flexors general function and attachment

    Most forearm flexors flex the wrist and fingers. They generally attach on the medial epicondyle of the humerus and insert on various bones of the wrist and hand.

  • Forearm extensors general function and attachment

    Forearm extensors extend the wrist and fingers. They generally attach on the lateral epicondyle of the humerus and insert on wrist and hand bones.

  • Function of the Flexor Carpi Radialis

    Flexes and abducts the wrist. Attaches from the medial epicondyle of the humerus to the base of the 2nd and 3rd metacarpals.

  • Function of the Flexor Carpi Ulnaris

    Flexes and adducts the wrist. Attaches from the medial epicondyle and ulna to the pisiform and 5th metacarpal.

  • Function of the Extensor Carpi Radialis Longus

    Extends and abducts the wrist. Attaches from the lateral supracondylar ridge of the humerus to the base of the 2nd metacarpal.

  • Function of the Extensor Carpi Ulnaris

    Extends and adducts the wrist. Attaches from the lateral epicondyle of the humerus to the base of the 5th metacarpal.

  • Mnemonic to remember forearm flexors vs extensors

    "FLEXors on the MEDial side, EXTENSors on the Lateral side" helps recall that flexors attach to the medial epicondyle and extensors to the lateral epicondyle.

  • Function of the Rectus Abdominis muscle

    Flexes the vertebral column and compresses the abdomen. Attaches from the pubic crest to the xiphoid process and ribs.

  • Function of the External Oblique muscle

    Compresses abdomen and rotates the trunk. Attaches from the lower ribs to the iliac crest and linea alba.

  • Function of the Gluteus Maximus muscle

    Extends and laterally rotates the thigh. Attaches from the ilium and sacrum to the gluteal tuberosity of the femur.

  • Function of the Quadriceps Femoris group

    Extends the knee. Includes rectus femoris, vastus lateralis, medialis, and intermedius attaching from femur and pelvis to the tibial tuberosity via the patellar ligament.

  • Function of the Hamstring group

    Flexes the knee and extends the hip. Includes biceps femoris, semitendinosus, and semimembranosus attaching from ischial tuberosity to tibia and fibula.

  • Function of the Tibialis Anterior muscle

    Dorsiflexes and inverts the foot. Attaches from the lateral tibia to the medial cuneiform and 1st metatarsal.

  • Function of the Gastrocnemius muscle

    Plantarflexes the foot and flexes the knee. Attaches from the femoral condyles to the calcaneus via the Achilles tendon.