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MOINA of the thorax
Origin, Insertion, Nerve supply, Action of muscles of the Thorax
Question | Answer |
---|---|
What muscle/s originates at inferior border of the rib? | External intercostals and Internal intercostals |
Insertion of Innermost intercostal muscle | Adjacent ribs |
Muscles innervated by the intercostal nerves | External intercostal, Internal intercostal, Innermost intercostal, Serratus posterior superior, and Serratus posterior inferior |
It assists external and internal intercostals | Innermost intercostal |
Where does the Serratus posterior superior muscle originates? | Lower cervical and upper thoracic spines |
Where does the Serratus posterior inferior muscle inserted? | Lower ribs |
Innervated by the posterior rami of thoracic spinal nerves | Levatores costarnum |
Very important muscle for inspiration; it increases vertical diameter of thorax; and assists in raising lower ribs | Diaphragm |
Muscle/s inserted at superior border of rib | External intercostals and Internal intercostals |
What muscle originates at adjacent ribs? | Innermost intercostal |
Inserted at the upper ribs | Serratus posterior superior |
Muscle/s that raises ribs, and one of the inspiratory muscles | Serratus posterior superior and Levatores costarum |
Where does the Diaphragm inserted? | Central tendon |
It raises ribs during inspiration; and increases anteroposterior and transverse diameters of the thorax | External intercostals |
Where does diaphragm originates? | Xiphoid process (sternal part); Lower 6 costal cartilages (costal part); and First 3 lumbar vertebrae (vertebral part) |
Action of Serratus posterior inferior muscle | depresses ribs and one of the expiratory muscles |
Nerve supply of Diaphragm | Phrenic nerve |
Originated at the tip of transverse process of C7 and T1-T11 vertebrae | Levatores costarum |
Lowers ribs during expiration | Internal intercostal |
Where does Serratus posterior inferior originated? | Upper lumbar and Lower thoracic spines |
Where does the Levatores Costarum muscle inserted? | Rib below |