Flashcards in Anatomy of the Breast Deck (17)
What marks the base of the breast?
Rib 2 - Rib 6 (midclavicular line)
What muscles underlie the breast?
Laterally: Serratus Anterior + External Oblique
What subunits are the breast made of? How many of them are there?
Ductal Lobular Units - 15-20 of them
How many milk ducts are there in the breast?
What is interspersed between the ductal lobular units?
What structures divide the breast?
Fibrous septae - Suspensory ligaments of Cooper
What are the two views in a mammogram?
Medial-Lateral Oblique (MLO)
Is the upper part of a cranio-caudal mammogram the lateral or medial side?
What can breast cancer cause that appears as white streaks following the ducts?
What happens if the tumour interferes with the suspensory ligaments of Cooper?
Tethering of the skin
Describe the blood supply to the breast.
Rich blood supply with branches from:
Internal thoracic artery
Lateral thoracic artery
What nerves are mainly involved in providing sensory innervation to the breast?
Anteromedial and anterolateral branches of intercostal nerves T3-T5
What nerve supplies the nipple?
Lateral cutaneous branch of the intercostal nerve T4
How are benign lumps different to breast cancer?
They are smooth and longer than they are tall in the longitudinal plane
Where does the lymph from the superficial and deep parts of the breast initially drain to?
Superficial - subareolar plexus
Deep - submammary plexus
Where does it then drain to from here?
Axillary group of pectoral lymph nodes