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MOINA of the thorax

Origin, Insertion, Nerve supply, Action of muscles of the Thorax

QuestionAnswer
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
Created by: alssndr
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