Mammary Gland Flashcards

1
Q

What are the characteristics of the mammary gland?

A

It is a modified sweat gland
Accessory female reproductive organ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the vertical extent of the mammary gland?

A

2nd to 6th rib in mid clavicular line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the lateral extent of the mammary gland?

A

Lateral border of sternum to mid-axillary line along the 4th rib

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the mammary bed?

A

Base on which the gland rests formed by:
* Pectoralis major-medial 2/3rd
* Serratus anterior-lateral 1/3rd
* External oblique aponeurosis in infero-medial quadrant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the retromammary space?

A

Loose connective tissue between the base of gland and the deep fascia covering mammary bed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the axillary tail of Spence?

A

Tail-like projection enters the axilla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the nipple?

A

Conical projection at the level of 4th intercostal space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the structure of the nipple?

A
  • Pierced by 15-20 lactiferous ducts
  • Circularly & longitudinally disposed smooth muscles
  • Rice nerve supply
  • No subcutaneous fat or hair
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the areola?

A

Pigmented circular area around the base of the nipple

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the structure of the areola?

A

Modified sebaceous glands on the outer margin-tubercles of Montgomery-lubrication
Beneath the areola lactiferous ducts dilate to form lactiferous sinus before passing through the nipple
Lymphatic plexus of sappy- subareolar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Define parenchyma

A

Parenchyma is the functional tissue of an organ as distinguished from the connective and supporting tissue.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are lobes in the parenchyma?

A

A lobe is a cluster of alveoli drained by a lactiferous duct (milk ducts, mammary ducts)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Describe the lobes

A

Composed of glandular tissue compound: tubulo-alveolar arranged in lobes
15-20 pyramidal lobes
Lobes are arranged in radiating manner converge towards the areola

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the lactiferous sinus?

A

Slight dilatation of lactiferous duct beneath the areola.
Small amount of milk may accumulate here in active gland

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are myoepithelial cells?

A

Found around the alveoli and ducts.
Their contraction facilitate passage of the milk from the alveoli

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are the support structures of the breast tissue?

A

Stroma: Supporting framework of the gland
Ligaments of Cooper: Bands of fibrous, flexible connective tissue underlying the pectoral fascia
Fatty tissue

17
Q

Describe mammary glands in prepuberty

A

Presence of lactiferous ducts without alveoli

18
Q

Describe mammary glands at puberty

A

Ducts undergo branching
Forms solid masses which are precursors of alveoli

19
Q

Describe mammary glands during pregnancy and lactation

A

Proliferation & epithelial growth of ducts & lobules
Increase in the number of alveoli

20
Q

Which arteries supply the mammary glands?

A

Internal thoracic artery: Perforating branches
Axillary artery: Lateral thoracic, superior thoracic & thoraco-acromial branches
Posterior intercostal arteries: Lateral branches

21
Q

Which veins drain the mammary glands?

A

Veins follow the arteries and form the plexus circulous venosus under the areola
Superficial veins drain into internal thoracic vein
Deep veins drain into internal thoracic, axillary & posterior intercostal veins

22
Q

Describe the nerve supply of the mammary glands

A

Supplied by anterior and lateral cutaneous branches of 4th to 6th intercostal nerves
Convey sensory fibers to the skin
Autonomic fibers to smooth muscles

Note: These nerves do not control milk secretion. It is controlled by hormone prolactin

23
Q

Describe the deep lymphatic drainage of the mammary glands

A

Deep lymphatics: Drain the parenchyma including areola & nipple
75% drained by axillary lymph nodes – end mostly in anterior group close to the axillary tail of spence partly into posterior & apical groups
20% drained into parasternal group from both medial & lateral parts
5% drained into posterior intercostal nodes

24
Q

Describe the superficial lymphatic drainage of the mammary glands

A

Superficial lymphatics: Drain the overlying skin excluding areola & nipple
Outerpart: axillary nodes
Upper part: supraclavicular nodes
Inner part: parasternal nodes

25
What is fibrocystic breast disease?
Benign condition Often related to cyclic changes in glandular tissue Occurs in 80% of women
26
What are fibroadenomas?
Firm, painless, solitary, palpable mass Benign neoplasms of glandular epithelium
27
What is breast cancer?
Most common malignancy in women Infiltrating ductal carcinoma is most common type Involves the suspensory retinacula Causes retraction of the ligaments and dimpling of the overlying skin
28
What is peau d'orange?
Obstruction & invasion of subcutaneous lymphatics, stagnation of lymph and skin edema creating orange peel appearance
29
Where are tumors generally palpated on breast tissue?
60% of palpable tumors are found in upper outer breast quadrant closest to the axilla including the axillary tail