"Each intercostal space is supplied segmentally by muscular branches of anterior rami of spinal nerves T1-T11. The branches of anterior rami of spinal nerves are:"
"parietal peritoneal sensory branches (from T7-T11 only)"
Expected headings
"Muscle layers"
"Neurovascular bundle"
"Blood supply"
"Arterial supply"
"Venous drainage"
"The intercostal spaces, also known as interspaces, are the spaces between the ribs. There are 11 spaces on each side and they are numbered according to the superior rib."
"The intercostal spaces contain three layers of muscle: the external, internal and innermost layers with the neurovascular bundle found between the internal and innermost layers."
"The external intercostal muscle is the outermost muscle of the intercostal space. This muscle has fibres which run in a downwards, forwards and medial direction from the inferior border of the superior rib to insert on the outer lip of the inferior rib."
"The internal intercostal muscle is the middle layer of the intercostal space. This muscle has fibres which run in a downwards, backwards and lateral direction from the inferior border of the superior rib to insert on the superior border of the inferior rib."