Anatomy of the Breast Flashcards Preview

LSS 1 - Thorax Anatomy - Laz > Anatomy of the Breast > Flashcards

Flashcards in Anatomy of the Breast Deck (17)
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1

What marks the base of the breast?





Rib 2 - Rib 6 (midclavicular line)

2

What muscles underlie the breast?

Pectoralis Major
Laterally: Serratus Anterior + External Oblique

3


What subunits are the breast made of? How many of them are there?

Ductal Lobular Units - 15-20 of them

4

How many milk ducts are there in the breast?

4-18

5



What is interspersed between the ductal lobular units?

FAT

6

What structures divide the breast?



Fibrous septae - Suspensory ligaments of Cooper

7



What are the two views in a mammogram?

Cranio-Caudal
Medial-Lateral Oblique (MLO)

8

Is the upper part of a cranio-caudal mammogram the lateral or medial side?

Lateral

9

What can breast cancer cause that appears as white streaks following the ducts?

Microcalcification

10


What happens if the tumour interferes with the suspensory ligaments of Cooper?

Tethering of the skin

11

Describe the blood supply to the breast.






Rich blood supply with branches from:
Internal thoracic artery
Lateral thoracic artery
Thoraco-dorsal artery
Thoraco-acromial artery
Intercostal arteries

12

What nerves are mainly involved in providing sensory innervation to the breast?

Anteromedial and anterolateral branches of intercostal nerves T3-T5

13



What nerve supplies the nipple?


Lateral cutaneous branch of the intercostal nerve T4

14



How are benign lumps different to breast cancer?


They are smooth and longer than they are tall in the longitudinal plane

15


Where does the lymph from the superficial and deep parts of the breast initially drain to?


Superficial - subareolar plexus
Deep - submammary plexus

16


Where does it then drain to from here?


Axillary group of pectoral lymph nodes

17




When using dye to identify the sentinal lymph node, two blobs can appear on the X ray. What is the large blob usually caused by?

Bigger blob is probably the site of injection of the dye