Muscles Of Thorax - Back Flashcards
Erector Spinae (spinalis, longissimus, iliocostalis)
A: prime movers of back extension
Teres major
O: inferior angle of scapula
I: Lesser tubercle of humerus
A: extends, adducts and medially rotates arm
Teres minor
O: lateral border of scapula
I: Greater tubercle of humerus
A: Laterally rotates humerus
Subscapularis
O: subscapular fossa of scapula
I: Lesser tubercle of humerus
A: medially rotates and stabilizes shoulder
Infraspinatus
O: Infraspinous fossa of scapula
I: Greater tubercle of humerus
A: rotates arm laterally
Supraspinatus
O: supraspinous fossa of scapula
I: Greater tubercle of scapula
A: abducts and stabilizes shoulder
Latissimus dorsi
O: lower 6 thoracic, all lumbar vertebrae and iliac crest
I: intertubercular groove of humerus
A: extends, adducts and medially rotates arm
Rhomboids major and minor
O: C7 to T5
I: medial border of scapula
A: Stabilizes scapula, retracts, and rotates downward
What muscles medially rotate the shoulder/ arm/ scapula/ humerus ?
Arm: pectoralis major, latissimus dorsi, teres major
Scapula: subscapularis
Muscles that retract scapula
trapezius, rhomboids,
What muscles laterally rotate the shoulder/ arm/ scapula/ humerus ?
Teres minor, infraspinatus
Trapezius
O: occipital bone, spine C7, and all thoracic
I: clavicle, acromion and spine of scapula
A: extends head, elevates, depresses, rotates, retracts scapula
Which muscles adduct arm?
Latissimus dorsi
Teres major
Pectoralis major
What muscle abducts arm?
Supraspinatus
Internal oblique, external oblique, & rectus abdomisis do what?
Flex and rotate trunk
