7 Deltopectoral Triangle Boundaries:Anterior border of the deltoid.Superior border of the pectoralis major.Middle third of the clavicle.
8 Deltopectoral Triangle Contents:Cephalic vein.Deltopectoral lymph nodes.Deltoid branch of the thoracoacromial artery.
9 Clavipectoral Fascia Invests subclavius and pectoralis minor. Attached to clavicle and anterior thoracic wall.Pierced by:Cephalic veinThoracoacromial arteryLateral pectoral nerveBecome suspensory ligament of the axilla.
10 THORACIC WALL STRUCTURE (x.s.) Refer to Figure 15, p. 60 in syllabus as well as background material on pp
13 Mammary Glands Modified sweat glands 15-20 lobes Lobes separated by fibrous septaLactiferous duct (1 per lobe)Lactiferous sinus (ampulla):Dilation as duct enters nipple
14 Mammary Glands Fibrous tela subcutanea: Fatty tela subcutanea: Connective tissue layer surrounding the entire gland.Fatty tela subcutanea:Adipose tissue deep to fibrous layer.Suspensory ligament of Cooper:Bundles of collagen fibers in dermis and hypodermis.
15 Mammary GlandsBreast extends from 2nd-3rd rib superiorly to 6th-7th costal cartilage inferiorly.Extends from lateral border of sternum to beyond the anterior axillary fold.
16 Mammary Glands Retromammary space: Sinus mammarumis: Space between the gland and the pectoralis major muscle.Sinus mammarumis:Space between the two glands.
17 Mammary Gland Arteries Anterior perforating arteries:From internal thoracic arteryTo medial part of glandMedial mammary rami:From 2nd - 4th anterior perforating arteriesTo deep medial part of gland
18 Mammary Gland Arteries Lateral mammary artery:From lateral thoracic artery.To inferior part of gland.Lateral mammary rami:From lateral cutaneous branches of intercostal arteries.To lateral part of the gland.
19 Mammary Gland VeinsSuperficial and deep venous plexuses drain into internal thoracic, lateral thoracic, and intercostal veins.
20 Mammary Gland Nerves Lateral mammary nerve: T2-T6Anterior branch of lateral cutaneous branch of intercostal nerves.Medial mammary nerve:Lateral branch of anterior cutaneous branch of intercostal nerves.
21 Mammary Gland Lymphatics Perilobular and interlobular lymphatic vessels:Into:Subareolar plexus:Lateral lymphatic trunk:From lateral and superior glandMedial lymphatic trunk:From medial and inferior gland
22 Mammary Gland Lymphatics Lateral lymphatic trunk and Medial lymphatic trunk:Into:Pectoral group of axillary lymph nodes:Subclavian lymphatic channels
23 Mammary Gland Lymphatics Accessory lymphatic drainage:Periphery of gland drains into apical group of axillary nodes and follows thoracoacromial trunk.Circumareolar channels drain into sternal chain.