Lecture Notes - Pectoral Region & Breast

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.

Objectives
On session #3 handout and on web! Use these to guide learning and study!

Know your bones and surface landmarks! (e.g. sternal angle = 2nd rib)
Breast
Structure

gland in subcutaneous tissue
15-20 lobes with lactiferous ducts and sinuses opening directly onto nipple
Neurovascular Supply

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"?)
Lymphatic Drainage

Clinical Significance: predicting the metastasis of carcinoma of the breast!
~75% to axillary nodes (via pectoral group)
remaining to parasternal and abdominal wall nodes

Pectoral Muscles
Reminder: know origin, insertion, action, & neurovascular supply for all muscles

Muscles

pectoralis major
pectoralis minor
(serratus anterior)
Nerves

medial pectoral nerve - pierces pectoralis minor; innervates both muscles
lateral pectoral nerve - runs w/ thoracoacromial artery; innervates pectoralis major
Blood Supply

thoracoacromial artery - through clavipectoral fascia