Muscle Quiz: Thorax & Abdomen Flashcards
pectoralis major
O: sternum, costal cartilage, clavicle
I: humerus
A: flex, adducts, medially rotate arm
pectoralis minor
O: ribs 3-5
I: scapula
A: protracts and holds scapula against thoracic wall
trapezius
O: superior nuchal line, ligamentum nuchae, vertebrae C7- T12
I: clavicle, scapula
A: elevates, retracts, rotates scapula
deltoid
O: clavicle
I: humerus
A: flex, extend, abducts, medically rotate arm
serratus anterior
O: ribs
I: scapula
A: protracts and holds scapula against thoracic wall
respiratory diaphragm
O: rib cage, sternum, lumbar vertebrae
I: central tendon
A: prime mover of inspiration
latissimus dorsi
O: thoracic and lumbar vertebrae, ribs, iliac crest
I: humerus
A: extends, adducts and medially rotate arm
subscapularis
O: scapula
I: humerus
A: medially rotate arm, stabilize shoulder joint
teres minor
O: scapula
I: humerus
A: laterally rotates arm, stabilize shoulder joint
teres major
O: scapula
I: humerus
A: extends, adducts, medially rotates arm
supraspinatus
O: scapula
I: humerus
A: assists in abducting arm, stabilizes shoulder joint
infraspinatus
O: scapula
I: humerus
A: laterally rotate arm, stabilize shoulder joint
levator scapulae
O: vertebrae C1- C4
I: scapula
A: elevates scapula
external intercostals
O: inferior border of the rib above
I: superior border of rib below
A: elevate rib cage, help in forced inspiration
internal intercostals
O: superior border of the rib below
I: inferior border of the rib above
A: depress the rib cage, helps in forced expiration
