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M of the Thorax
Nerve, blood supply, origin, insertion
Muscle | Origin | Insertion | Blood Supply | Innervation |
---|---|---|---|---|
Subcostales | Internal surface of one rib near angle | Internal surface of 2nd or 3rd rib below | A Pig Has Silly Sausage Muscles, Sometime sally Takes Long Showers | Adjacent intercostal aa |
Transversus thoracic | Lower 1/2 of posterior surface of sternum & xiphoid process; costal cartilage of lower 4 true ribs near sternal ends | Inner surfaces of costal cartilages of ribs 2-6 | A Pig Has Silly Sausage Muscles, Sometime sally Takes Long Showers | Adjacent intercostal nn |
Serratus posterior superior | Spines and supraspinous ligs of C7-t3 Aponeurosis from lower part of nuchal lig | Superior borders and external surfaces of ribs 2-5 | A Pig Has Silly Sausage Muscles, Sometime sally Takes Long Showers | Intercostal nn 2-5 |
Serratus posterior inferior | Spines and supraspinous ligs of t11-L3 | Inferior borders and external surfaces of ribs 9-12 | A Pig Has Silly Sausage Muscles, Sometime sally Takes Long Showers | Ventral rami of thoracic spinal nn 9-12 |
Levatores costarum | Tips of transverse processes of C7-T12 | Superior border and external surface of rib immediately below | A Pig Has Silly Sausage Muscles, Sometime sally Takes Long Showers | Lateral br of dorsal rami of corresponding thoracic spinal nn |
Diaphragm | Sternal: Back of xiphoid process Costal: Internal surfaces of lower 6 ribs & adjoining costal cartilage; Lumbar - Medial and lateral lumbocostal arches and lumbar vertebraes | Central tendon below pericardium | Central: superior and inferior phrenic aa, musculophrenic a, pericardacophrenic a Costal margins: Lower 5 intercostal and subcostal aa | Phrenic nn |
External intercostal | 11 pairs from lower border of one rib | Upper border of rib below | Ant. intercostal a from internal thoracic a Post. intercostal aa from desc. thoracic a; Highest intercostal a; Subcostal a; Sup. thoracic a; Musculophrenic a; Addition: Suprascapular; superficial cervical, thoracoacromial,lat. thoracic, & subscap aa | Adjacent intercostal nn |
Internal intercostals | 11 pairs from floor of one costal groove and adjacent costal cartilage | Upper border of rib below | A pig has silly sausage muscles, Sometimes Sally take long showers | Adjacent intercostal nn |
Innermost intercostals | Internal aspect of one rib | Internal aspect of adjoining rib | A Pig Has Silly Sausage Muscles, Sometime sally Takes Long Showers | Adjacent intercostal nn |