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Anatomy 2 > Breast anatomy > Flashcards

Breast anatomy Flashcards

1
Q

what are the different regions of the breast?

A

circular body

axillary tail

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2
Q

what space do the breasts take up?

A

span 2nd - 6th intercostal muscles

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3
Q

what are breasts made up of?

A

mammary glands

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4
Q

what are mammary glands made up of?

A

modified sweat glands consisting of lobules and ducts

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5
Q

what is a lobule?

A

made up of alveoli which are drained by a lactiferous duct

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6
Q

what surrounds the mammary glands?

A

Connective tissue stroma

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7
Q

what is the connective tissue stroma?

A

surrounds and supports mammary glands, 2 components

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8
Q

what are the 2 components of the connective tissue stroma?

A

fibrous stroma

pectoral fascia

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9
Q

what is the pectoral fascia?

A

connective tissue overlying the pectoralis major which acts as an attachment point for ligaments

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10
Q

what is found between the pectoral fascia and the breast?

A

retromammary space

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11
Q

what is the fibrous stroma and what does it do?

A

they condense to form suspensory ligaments which separate the lobules and secure the breast to the dermis and pectoral fascia

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12
Q

where can extra nipples/ breasts form?

A

along the mammary crest ridge - accessory nipples and breasts

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13
Q

what is the embryological origin of breasts?

A

invagination of chest wall

ectoderm forms branching ducts, which during puberty sprout alveoli

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14
Q

what is the blood supply of the lateral breast?

A

axillary artery

lateral thoracic and acromio thoracic branches

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15
Q

what is the blood supply of the medial breast?

A

internal mammary/ thoracic artery through pectoralis major

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16
Q

what is the lymphatic drainage of the breast?

A

97% axillary nodes
3% internal mammary nodes
parasternal node

17
Q

where does the lymph of the breast drain into?

A

left > thoracic duct

right > subclavian vein or right jugular trunk

18
Q

draining of parasternal nodes

A

mediastinal nodes first then thoracic duct

inferiorly > groin nodes

19
Q

complexity of lymphatic drainage

A

normal pathways can be interrupted by malignancies, surgery or radiotherapy
neck nodes can arise from blocked thoracic duct

20
Q

where can secondaries be found?

A

in lymphatics of opposite breast, opposite axillary nodes or groin nodes

21
Q

where is the nipple located

A

4th intercostal space for men and varied for women

22
Q

nerve supply of breast

A

T3-5th intercostal

supraclavicular nerves from cervical plexus to upper and lateral parts

23
Q

what does the T3-5th nerve supply?

A

sensory to skin

sympathetic to blood vessels to breast and smooth muscle in skin and nipple

24
Q

what is the nipple made up of?

A

smooth muscle

25
Q

what is the areola made up of?

A

sebaceous glands

Anatomy 2 (5 decks)

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