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10 Cards in this Set

  • Front
  • Back
Transverse Thoracic
Innervation: Intercostal n.
Action: Weakly depresses ribs
Subcostal
Innervation: Intercostal n.
Action: Same manner as internal intercostal muscles
Levator costarum
Innervation: Posterior rami of C8-T11 nerves
Action: Elevate ribs
Serratus posterior inferior
Innervation: 9th-11th inercostal n.; subcostal (T12) n.
Action: Depress ribs
Serratus posterior superior
Innervation: 2nd-5th intercostal n.
Action: Elevate ribs
Intercostal Muscles (External, Internal and Innermost)
Innervation: Intercostal n.
Action: elevate ribs during forced inspiration; interosseus part depresses ribs and interchondral part elevates ribs during forced expiration
Pectoralis major
Innervation: Lateral & Medial pectoral nerves
Action: adducts and medially rotates humerus; draws scapula anteriorly and inferiorly; clavicular head flexes humerus; sternocostal head extends humerus from flexed position
Pectoralis minor
Innervation: Medial pectoral nerve
Action: stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall
Subclavius
Innervation: nerve to subclavius
Action: Anchors and depresses clavicle
Serratus anterior
Innervation: Long thoracic n.
Action: Protracts scapula and holds it against thoracic wall; rotates scapula