Muscles Origins, Insertions, Actions, Innervations Flashcards
Pectoral is major insertion
Greater tubercle of the humerus
Pectoralis major action
Prime mover of arm flexion; adduction, and medial rotation of arm
Deltoid origin
Spine and acromion process of the scapula, lateral 1/3 of the clavicle
Deltoid insertion
Deltoid tuberousity of humerus
Deltoid action
Prime mover of arm abduction; synergist in flexion, extension
Coracobrachialis origin
Coracoid process of scapula
Coracobrachialis insertion
Mid medial shaft of humerus
Coracobrachialis action
Arm flexion and adduction
Serratus anterior origin
Ribs 1-8 (or 9)
Serratus anterior insertion
Vertebral border of scapula
Pectoralis minor origin
Ribs 3-5 (ventral surface)
Pectoralis minor insertion
Coracoid process of scapula
Long head of biceps brachii origin
Supraglenoid tubercle of the scapula
Short head biceps brachii origin
Coracoid process of scapula
Biceps brachii insertion
Radial tuberosity
Biceps brachii action
Major forearm flexor; supinates the forearm; weak flexor of arm
Brachialis origin
Anterior, distal surface of humerus
Brachialis insertion
Coronoid process and tuberosity of ulna
Brachialis action
Major forearm flexor
Brachioradialis origin
Lateral epicondyle of humerus
Brachioradialis insertion
Styloid process of radius
Brachioradialis action
Forearm flexion
Iliacus origin
Iliac fossa of the os coxa
Iliacus insertion
Lesser trochanter of the femur
Iliacus action
Prime flexor of thigh, postural muscle
Psoas Major origin
Vertebrae T12-L5
Psoas Major insertion
Lesser trochanter of femur
Psoas major action
Prime flexor of thigh, postural muscle
Sartorius origin
Anterior superior iliac spine
Sartorius insertion
Medial proximal tibial shaft (near tibial tuberosity)
Sartorius action
Flexion and lateral rotation of thigh; flexion of lower leg
Rectus femoris origin
Anterior inferior iliac spine and superior margin of acetabulum
Rectus femoris insertion
Patella and tibial tuberosity via patellar ligament
Rectus femoris action
Thigh flexion, lower leg extension
Vastus lateralis origin
Anterior and inferior border of greater trochanter and Linea aspera of femur
Vastus lateralis insertion
Patella and tibial tuberosity via patellar ligament
Vastus lateralis action
Lower leg extension and stabilizes patella
Vastus medialis origin
Linea aspera of femur
Vastus medialis insertion
Patella and tibial tuberosity via patellar ligament
Vastus medialis action
Lower leg extension and stabilizes patella
Vastus intermedius origin
Proximal anterolateral femoral shaft
Vastus intermedius insertion
Patella and tibial tuberosity via patellar ligament
Vastus intermedius action
Lower leg extension
Tensor fasciae latae origin
Anterior aspect of iliac crest and anterior superior iliac spine
Tensor fasciae latae insertion
Iliotibial tract
Tensor fasciae latae action
Abduction and flexion of thigh
Pectineus origin
Pubis of of coxa
Pectineus insertion
Pectineal line of femur
Pectineus action
Adduction and flexion of thigh
Gracilis origin
Ramus and body of pubis of os coxa
Gracilis insertion
Medial proximal tibial shaft
Gracilis action
Adducts thigh; flexes and medially rotates leg
Adductor longus origin
Inferior Ramus of pubis of os coxa
Adductor longus insertion
Linea aspera of femur
Adductor longus action
Adduction and medial rotation of thigh (when flexed)
Adductor Magnus origin
Ischial and pubic rami and ischial tuberosity of os coxa
Adductor Magnus insertion
Linea insertion of femur
Adductor Magnus action
Extension, adduction, and medial rotation of thigh (when flexed)
Pectoralis Major origin
Origin of clavicular head is clavicle. Sternocostal head is the sternum and costal cartilage 2-6.
Latissimus Dorsi origin
Spines of T7-T12, L1-L5, ribs 8-12, iliac crest, and thoracolumbar fascia
Latissimus Dorsi insertion
Intertubercular groove of humerus
Latissimus Dorsi action
Prime arm extensor, adduction and medial rotation at the shoulder; depresses shoulder
Supraspinatus origin
Supraspinous fossa of scapula
Infraspinatus origin
Infraspinous fossa of scapula
Infraspinatous insertion
Greater tubercle of humerus
Infraspinatus action
Stabilizes shoulder joint, laterally rotates arm
Supraspinatus insertion
Greater tubercle of humerus
Supraspinatus action
Stabilizes shoulder joint; abducts arm
Subscapularis origin
Subscapular fossa of scapula
Subscapularis insertion
Lesser tubercle of humerus
Subscapularis action
Prime medial rotator of arm; stabilizes shoulder joint
Teres minor origin
Lateral scapular border
Teres minor insertion
Greater tubercle of humerus
Teres minor action
Stabilizes shoulder joint; laterally rotates arm
Origin of triceps brachii long head
Infraglenoid tubercle of scapula
Origin of triceps brachii lateral head
Proximal end of lateral humeral margin
Origin of triceps brachii medial head
Distal to radial groove on posterior humeral shaft
Triceps brachii insertion
Olecranon process of ulna
Triceps brachii action
Prime extensor of forearm; extends arm
Aconeus origin
Lateral epicondyle of humerus
Aconeus insertion
Lateral aspect of olecranon process of ulna
Aconeus action
Abduction of ulna during forearm pronation; forearm extensor
Erector spinae action
Prime mover of back extension
Trapezius origin
Occipital bone, ligamentum nuchae, spinous process C7-T12
Trapezius insertion
Spine and acromion process of scapula, lateral 1/3 of clavicle
Trapezius action
Stabilizes, elevates, retracts, depresses, and rotates scapula forward
Levator scapulae origin
Transverse process of C1-C4
Levator scapulae insertion
Superior vertebral border of scapula
Rhomboideus major origin
Spinous process T2-T5
Rhomboideus major insertion
Medial border of scapula from spine to inferior angle
Rhomboideus major action
Adducts scapula and performs downward rotation of scapula
Rhomboideus minor origin
Spinous process C7-T1
Rhomboideus minor insertion
Medial border of scapula, superior to rhomboideus major
Rhomboideus minor action
Adducts scapula and performs downward rotation of scapula
Teres Major origin
Inferior angle of scapula
Teres major insertion
Intertubercular groove of humerus
Teres major action
Extension, medial rotation, and adduction of arm
Gluteus Maximus origin
Dorsal ilium, coccyx, sacrum, lumbodorsal fascia
Gluteus Maximus insertion
Gluteal tuberosity of femur and iliotibial tract
Gluteus Maximus action
Major thigh extensor; lateral rotation of thigh
Gluteus Medius origin
Anterior iliac crest of ilium between posterior and anterior gluteal lines
Gluteus Medius insertion
Greater trochanter of femur
Gluteus Medius action
Abduction and medial rotation of thigh; steadies pelvis
Gluteus minimus origin
Lateral surface of ilium between inferior and anterior gluteal lines
Gluteus minimus insertion
Greater trochanter of femur
Gluteus minimus action
Abduction and medial rotation of thigh; steadies pelvis
Piriformis origin
Anterolateral surface of sacrum
Piriformis insertion
Greater trochanter of femur
Piriformis action
Abduction (when thigh is flexed) and lateral rotation of thigh
Superior gemellus origin
Ischial spine
Superior gemellus insertion
Medial surface of greater trochanter of femur
Superior gemellus action
Lateral rotation of thigh; abduction (when thigh is flexed)
Obturator internus origin
Obturator membrane and obturator foramen
Obturator internus insertion
Greater trochanter of femur
Obturator internus action
Lateral rotation of thigh
Inferior gemellus origin
Ischial tuberosity
Inferior gemellus insertion
Medial surface of greater trochanter of femur
Inferior Gemellus action
Lateral rotation of thigh; abduction (when thigh flexed)
Quadratus femoris origin
Ischial tuberosity
Quadratus femoris insertion
Intertrochanteric crest of femur
Quadratus femoris action
Lateral rotation of thigh
Origin of biceps femoris long head
Ischial tuberosity
Origin of biceps femoris short head
Linea aspera and distal femur
Biceps femoris insertion
Head of fibula and lateral condyle of tibia
Biceps femoris action
Extension of thigh; flexion and lateral rotation of leg
Semitendinosus origin
Ischial tuberosity
Semitendinosus insertion
Medial aspect of proximal tibial shaft
Semitendinosus action
Extension of thigh; flexion and medial rotation of leg
Semimembranosus origin
Ischial tuberosity
Semimembranosus insertion
Medial condyle of tibia
Semimembranosus action
Extension of thigh; flexion and medial rotation of leg