Limbs Posterior Shoulder Pathways Notes

1. Pathways to Posterior Shoulder
1. Blood Supply 
1. Aorta  aortic arch  L subclavian or brachiocephalic to R subclavian  
1. Dorsal scapular  medial scapula 
2. Thyrocervical trunk  suprascapular  supra and infraspinatus fossa 
3. Axillary third part  
1. Posterior circumflex humoral  upper arm 
2. Subscapular  circumflex scapular  infraspinatus fossa 
2. Blood Drainage 
1. Posterior circumflex humoral  basilic  axillary  subclavian  brachiocephalic  SVC
3. Nerve Supply 
1. Afferent 
1. Somatic 
1. Supra and infraspinatus fossa  suprascapular nerve  superior trunk  C5-6  dorsal roots  spinal cord 
2. Deltoid muscle  axillary nerve posterior cord  superior, middle, and inferior trunks  C4-T1  dorsal roots  spinal cord
2. Autonomic 
1. N/A
2. Efferent 
1. Somatic 
1. Same as afferent except reverse order 
2. Autonomic 
1. Sympathetic 
1. IML  ventral root  
1. Ventral rami of cervical spinal nerves  cervical sympathetic ganglion  gray rami  brachial plexus  
1. Axillary nerve 
2. Suprascapular nerve (superior trunk)
2. Ventral rami of cervical spinal  cervical sympathetic ganglion  gray rami  dorsal rami  dermatomes C6-T1