lower 1/2 of posterior surface of the sternum and xiphoid process
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transversus thoracis muscle insertion
posterior surfaces of the costal cartilages from 2nd to 6th
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typical intercostal nerves
T3 to T6
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Typical intercostal nerve (3rd to 6th) origin
anterior (ventral) ramus of thoracic spinal nerve
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Typical intercostal nerve branches
1. branches to sympathetic trunk
1. muscular branch to the intercostal muscles 2. lateral cutaneous branch (divides into anterior and posterior branches) 3. anterior cutaneous branch (divides into medial and lateral branches) 4. sensory branch to the parietal pleura 5. collateral branch (runs on the upper border of rib below)
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Internal Thoracic artery origin
from 1st part of subclavian artery in the neck
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Internal Thoracic artery termination
in the 6th intercostal space by dividing into:
* superior epigastric artery * musculophrenic artery