Anat- Thoracic wall muscles
Terms
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- 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