Term
Muscles of the anterior thorax
which ones insert into the pectoral girdle |
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Definition
pectorals major
pectoralis minor
serratus anterior
subclavius
sternocleidomastoid
anteriorscalene
pectoralis minor, serratus anterior, subclavius |
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Term
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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 |
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Term
| Serratus anterior/ boxer's muscle |
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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 |
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Term
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Definition
| originates from brachial plexus inserts medial border deep to scapula |
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Term
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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 |
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Term
| Muscle of the anterior neck |
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Definition
anterior scalene
sternocleidomastoid |
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Term
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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 |
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Term
| Anterior scalene (middle, anterior, posterior scalenes) |
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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 |
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Term
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Definition
latissimus dorsi
trapezius
levator scapulae
rhomboid major and minor |
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Term
| which muscles of posterior thorax insert into pectoral girdle |
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Definition
| trapezius, levator scapulae, rhomboids major and minor |
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Term
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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 |
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Term
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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 |
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Term
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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 |
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Term
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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 |
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Term
pectoral girdle fundamental movement
who elevates |
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Definition
trapezius (upper fibers)
levator scapulae |
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Term
pectoral girdle fund. movement
depression |
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Definition
trapezius (lower fibers)
serratus anterior
latissimus dorsi
pectoralis minor
subclavius |
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Term
| protraction abduction- forward lateral |
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Definition
serratus anterior
pectoralis minor |
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Term
| retraction-adduction-backward medial |
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Definition
trapezius (middle fibers)
rhomboids |
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Term
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Definition
trapezius (upper fibers)
serratus anterior |
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Term
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Definition
pectoralis minor
rhomboids
levator scapulae |
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