Thorax 4 - Breast + Lymphatic Drainage Flashcards

1
Q

Describe lactation

A

Alveoli (cuboidal cells) produce milk
Carried to areola in lactiferous ducts
Myoepthelial cells in alveoli contract in response to oxytocin (posterior pituitary) = pushes milk along ducts

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

Breast size depends on

A

Fat

younger women have denser less fatty breast than post-menopausal

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

What separates breast lobules

A

Suspensory ligaments w are continuous w dermis of skin - maintain breast shape

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

Breast Relations

A

Base -extends from Rib2-6 MCL
Overlies pec major and laterally extends to lie on serratus anterior + external oblique
Axillary tail extends into medial wall of axilla

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

Axillaa boundaries

A

Anterior - pec major
Medial - serratus anterior
Posterior: lat dorsi, subscapularis, teres major
lateral: intertubercular sulcus

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

Breast Blood supply (5)

A
Internal thoracic (dominant) - nipple areola gets a branch
Lateral thoracic
Thoraco-acromial
Dorsal artery
IC artery
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Lymphatics of breast

A

75% drains to pectoral group of axillary nodes w also gets drainage from subaerolar and submammary plexus.

Infraclavicular, abdominal lymphatics (inferiorly) and parasternal (medially) nodes get some drainage

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

Lymphatic tissues and organs contains:

A

tonsils, spleen, thymus, adenoids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Lymphatic system function

A

Drain excess EC fluid, drains everything except brain
Imm function
Nodes filter lymph bfore returns to circulatory system

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

Lymph nodes

A

palpable in armpit, groin and neck
Lymphadenopathy indicative of infection
Nodes are small and found along lymph vessels

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

Lymph

A

Clear and odourless
Lymph from SI is opaque and milky bc of fats abdorbed
Intestinal lymph = chyle.

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

Lymph movement

A

Main lymphatic vessel = thoracic duct

Start L2 on RHS at cisterna chyli,
Goes through diaphragm at T10, posterior to oesophagus
Ascends on R of midline between aorta and azygois vein
Crosses LHS at T5 and ascends
Travels posterior to great veins, bends anteriorly to drain into jugular angle.
thoracic duct drains into junction of L subclavian + L jugular vein merge to form L brachiocephalic vein

Other than R upper quadrant, drains into R subclavian vein, then drains into thoracic duct and into L subclavian

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

Thoracic Wall lymphatics

A
  • Parasternal nodes (anterior part of thoracic wall)
  • Upper part of intercostal lymphatics drains into brachiocephalic trunk
  • Cisterna chyli are lymphatics that drain abdomen and lower limbs. Diaphragmatic lymph nodes drain into aortic.lumbar area of thoracic duct
  • Superficial nodes drain via axillary/parasternal nodes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Lung Lymphatics

A

Tracjea-bronchial lymph nodes, largest lymph node collection sit under tracheal bifurcation.
They unit vessels from parasternal and briocephalic nodes forming L + R bronchiomediastinal trunks

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

Heart lymphatics

A

follow coronary arteries, drain into brachiocephalic + tracheobronchial vessels

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

Posterior Mediastinum lymphatics

A

lymph from oesophagus, diaphragm, liver and pericardium drain into thoracic duct and posterior mediastinal nodes