Lecture Notes - Pectoral Region, Posterior Shoulder & Breast
The streaming video of the 2004-5 lab overview is available on the web (password protected).
The computer presentation used by Ms. Stein in lecture is available on the web (password protected). You can also download the PowerPoint presentation to print or review.
On session #3 handout and on web! Use these to guide learning and study!Breast
Know your bones and surface landmarks! (e.g. sternal angle = 2nd rib)StructurePectoral Muscles
- gland in subcutaneous tissue
- 15-20 lobes with lactiferous ducts and sinuses opening directly onto nipple
- branches from body wall nerves and vessels (eg, intercostal nerves & vessels, internal thoracic vessels)
- nerves - T2-T6 (what kinds of nerve fibers? what are they "doing"?)
- Clinical Significance: predicting the metastasis of carcinoma of the breast!
- ~75% to axillary nodes (via pectoral group)
- remaining to parasternal and abdominal wall nodesReminder: know origin, insertion, action, & neurovascular supply for all muscles
- pectoralis major
- pectoralis minor
- (serratus anterior)
- medial pectoral nerve - pierces pectoralis minor; innervates both muscles
- lateral pectoral nerve - runs w/ thoracoacromial artery; innervates pectoralis major
- thoracoacromial artery - through clavipectoral fascia
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