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Glossary of Anat- Thoracic wall muscles

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Created by bekabirder

pectoralis major: insertion
lateral lip of intertubercular groove (sulcus) of humerus
pectoralis major: innervation
medial and lateral pectoral nerves
pectoralis major: action
adducts and medially rotates humerus, draws scapula anteriorly and inferiorly
pectoralis major: blood supply
thoracoacromial artery, pectoral veins
pectoralis minor: origin
3rd-5th ribs near their costal cartilages
pectoralis minor: insertion
medial border and superior surface of coracoid process of scapula
pectoralis minor: innervation
medial pectoral nerves
pectoralis minor: action
stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall
pectoralis minor: blood supply
pectoral branches of thoracoacromial artery, pectoral veins
subclavius: origin
junction of 1st rib and its costal cartilage
subclavius: insertion
inferior surface of middle third of clavicle
subclavius: action
anchors and depresses clavicle
subclavius: blood supply
clavicular border of thoracoacromial artery, subclavian artery & vein
serratus anterior: origin
external surfaces of lateral parts of 1st-8th ribs
serratus anterior: insertion
anterior surface of medial border of scapula
serratus anterior: innervation
long thoracic nerves
serratus anterior: action
protracts scapula and holds it against thoracic wall, rotates scapula
serratus anterior: blood supply
lateral thoracic artery, vein
external intercoastal: origin
inferior border of ribs
external intercostal: insertion
superior border of ribs below
external intercostal: innervation
intercostal nerves
external intercostals: action
during forced inspiration elevate ribs
external intercostals: blood supply
anterior and posterior intercostal arteries & veins
internal intercostals: origin
inferior border of the ribs
internal intercostals: insertion
superior border of ribs below
internal intercostals: innervation
intercostal nerves
internal intercostals: action
during forced inspiration; interosseous part depresses ribs, interchondral part elevates ribs
internal intercostals: blood supply
anterior and posterior intercostal arteries and veins
innermost intercostals: origin
inferior border of ribs
innermost intercostals: insertion
superior border of ribs below
innermost intercostals: innervation
intercostal nerves
innermost intercostals: action
aids in respiration
innermost intercostals: blood supply
anterior and posterior intercostal arteries and veins
diaphragm: openings
caval at T8, esophageal at T10, and aortic at T12
diaphragm: origin
xiphoid process, lower 6 costal cartilages, L1-L3 vertebrae
diaphragm: insertion
central tendon (aponeurosis)
diaphragm: innervation
phrenic nerves
diaphragm: action
most important muscle of respiration; used in abdominal straining and weight lifting
diaphragm: blood supply
phrenic arteries & veins
transversus thoracus: origin
posterior surface of lower sternum
transversus thoracus: insertion
internal surface of costal cartilages 2-6
transversus thoracus: innervation
intercostal nerves
transversus thoracus: action
weakly depresses ribs
transversus thoracus: blood supply
internal thoracic arteries and veins

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