Shared Flashcard Set

Details

15.The muscles of anterior and posterior thorax
N/A
20
Anatomy
3rd Grade
10/06/2013

Additional Anatomy Flashcards

 


 

Cards

Term
Muscles of the anterior thorax

which ones insert into the pectoral girdle
Definition
pectorals major
pectoralis minor
serratus anterior
subclavius
sternocleidomastoid
anteriorscalene
pectoralis minor, serratus anterior, subclavius
Term
pectoralis minor
Definition
O- anterior surface of ribs 3-5
I- coracoid process of scapula
N- medial and lateral pectoral nerves
A- draws scapula down and forward, elevates ribs

draw insertion closer to origin, pul coracoid process down towards rib 3-5; stabilizes scapula

muscles can change functionally as well as origin and function because fibers pull in different directions

if muscle contracts it lifts rib 3-5 up to help during deep inspiration
Term
Serratus anterior/ boxer's muscle
Definition
O- ribs 1-8 or 9
I- anterior surface of medial border of scapula
N- long thoracic nerve
A- holds scapula against chest wall, rotates scapula laterally, raises point of shoulder for arm abduction above 90 degrees

important to protract the scapula
Term
long thoracic nerve
Definition
originates from brachial plexus inserts medial border deep to scapula
Term
subclavius
Definition
O- costal cartilage of 1st rib
I- inferior surface of clavicle (lateral 1/3)
N- nerve to subclavius/ innerve of subclavius
A- stabilizes pectoral girdle, depresses shoulder,

holds clavicle in sterno clavicular joint, protects underlying subclavian vessel
Term
Muscle of the anterior neck
Definition
anterior scalene
sternocleidomastoid
Term
sternocleidomastoid
Definition
O- sternal head, manubrium; clavicular had, medial 1/3 clavicle
I- mastoid process of temporal bone; lateral 1/2 of superior nuchal line
N- spinal accessory nerve/ cranial nerve 11

attaches pectoral girdle to axial skeleton
contract bilateraly flexes head forward
unilateral flexes head to same side
Term
Anterior scalene (middle, anterior, posterior scalenes)
Definition
deep to sternocleidomastoid
origin- transverse process of cervical vertebrae 4-6
I- first rib
N- cervical spinal nerves
A- flexes head; elevates first rib to aid in inspiration

subclavian arter passes deep to anterior scalene
Term
Posterior thorax muscles
Definition
latissimus dorsi
trapezius
levator scapulae
rhomboid major and minor
Term
which muscles of posterior thorax insert into pectoral girdle
Definition
trapezius, levator scapulae, rhomboids major and minor
Term
trapezius
Definition
O- occipital bone from ligamentum nuchae spines of C7-T12
I- lateral 1/3 of clavicle (upper) acromion (middle) spine of scapula (lower fibers)
N- spinal accessory nerve (cranial nerve XI)
A- elevates scapula (upper fibers), retract (adduct), scapula (middle fibers), lowers and pulls scapula down (lower fibers)
all fibers stabilizes scapula
Term
levator scapulae
Definition
O- transverse processes of C1-C4 vertebrae
I- superior vertebral border of scapula
N- dorsal scapular nerve
A- elevates scapula when scapula is fixed it laterally flexes neck to same side, acting together to extend neck

if levitator scapulae contract while scapula is fixed pull neck posterior/extend neck
unilateral flexion of leavator scapula flex neck laterally to ipsilateral side
Term
Rhomboid minor
Definition
O- spinous process of C7-T1
I- root of spine of scapula
N- dorsal scapular nerve
A- draws scapula medially, retracts scapula, rotates scapula downward
Term
rhomboid major
Definition
O- spinous process of T2-T5
I- medial border of scapula below spine
N- dorsal scapular nerve
A- draws scapula medially retracts scapula, rotates scapula downward
Term
pectoral girdle fundamental movement
who elevates
Definition
trapezius (upper fibers)
levator scapulae
Term
pectoral girdle fund. movement
depression
Definition
trapezius (lower fibers)
serratus anterior
latissimus dorsi
pectoralis minor
subclavius
Term
protraction abduction- forward lateral
Definition
serratus anterior
pectoralis minor
Term
retraction-adduction-backward medial
Definition
trapezius (middle fibers)
rhomboids
Term
rotation-upward lateral
Definition
trapezius (upper fibers)
serratus anterior
Term
rotation downward medial
Definition
pectoralis minor
rhomboids
levator scapulae
Supporting users have an ad free experience!