Thoracic Walls and Breast Flashcards
Thoracic walls role (2)
protection and breathing mechanisms
Thoracic walls components (2)
thoracic cage and covering
Thoracic wall elements (8)
intercostal space, rib cage, deep fascia, pectoralis major, skin, superficial fascia, subcutaneous fat, intercostal muscles
intercostal space elements (3)
muscle, nerves, vessels
skin elements (6)
nerves, fat, blood vessels, lymphatic vessels, sweat glands, mammary gland
True ribs
R1-R7
floating ribs
R11 and R12
floating rib feature
no anterior attachment
false rib
R8-R10
false rib feature
attach to costal cartilage of the rib above
space between ribs
intercostal space
Costal cartilage role (2)
attaches ribs to sternum and provides rib cage mobility for breathing
Typical ribs
R3-R9
Atypical ribs
R1-R2 and R10-R12
typical rib appearance (2)
curved and flat
atypical rib feature
atypical markings
Typical rib elements (9)
head, neck, shaft, angle, superior facet, inferior facet, costal groove, articular facet, tubercle
Rib 1 markings (2)
groove for subclavian vessels and scalene tubercle
Sternum elements (8)
maubrium, xiphoid process, body, sternal angle, jugular notch, clavicular notch, manubriosternal joint, costal cartilage attachment
sternal angle other name
angle of Louis
Which rib costal cartilage attaches at the manubriosternal joint
C2
Number of thoracic vertebra
T1-T12
Thoracic vertebra elements (11)
lamina, pedicle, vertebral canal, transverse process, spinous process, superior articular facet, inferior articular facet, intervertebral foramen, body, intervertebral disc
Throacic vertebra role (3)
rotation and movement
Rib articulation with vertebra elements (9)
superior demifacet, inferior demifacet, tubercle, transverse process, costal facet, rib, rib head, costotransverse joint, costovertebral joint
Costovertebral joint is between (4)
inferior demifacet, superior demifacet, spinous process, rib head
costotransverse joint has how many parts
2
costotransverse joint is between (3)
costal facet, transverse process, and tubercle of rib
superior demifacet articulates with which rib
same number as vertebra
Intercostal muscles (4)
external, external intercostal membrane, internal, innermost internal
external intercostal fibre direction
antero inferior
internal intercostal fibre direction
postero inferior
external intercostal role
thoracic cage elevation
medial internal intercostal role
thoracic cage elevation
lateral internal intercostal role
throacic cage depression
innermost intercostal deficit
posteriorly
innermost intercostal fibre direction
postero inferior
intercostal space elements (7)
intercostal nerve, intercostal vein, intercostal artery, costal groove, innermost intercostal muscle, internal intercostal muscle, external intercostal muscle
pectoralis minor role (2)
elevates ribs and stabilises scapula
pectoralis major role
adducts arm
serratus anterior rib insertion
R1-R8
serratus posterior insertion and origin
spinous processes C7-T3 and T11-L2, rib angles R2-R5 and R7-R12
serratus posterior inferior role
rib depression
serratus posterior superior role
rib elevation
How many lobules in breast tissue
15-20
how much of pectoralis major covered by breast
2/3
How much of serratus anterior covered by breast
1/3
tail on breast
axillary tail
breast goes from to
mid axillary line to lateral border of the sternum
where is the nipple commonly found
4th intercostal space
darker patches on mammogram
suspensory ligaments
Arterial Blood supply to the breast (2)
lateral mammary branches medial mammary branches
lateral mammary branches branch from (2)
lateral thoracic artery and posterior intercostal arteries
lateral thoracic artery branches from
axillary artery
axillary artery branches from
subclavian artery
medial mammary branches branch from
internal thoracic artery
Breast venous drainage (2)
medial mammary vein and lateral mammary vein
medial mammary vein drains into
internal thoracic vein
lateral mammary vein drains into
lateral thoracic vein
lateral thoracic vein drains into
axillary vein
axillary vein drains into
subclavian vein
subclavian vein meets up with the
internal jugula vein
lymphatic plexus around arerola
subareola plexus
lymph nodes in armpit
axillary nodes
lymph nodes on sternum
parasternal nodes
do lymphatics cross between breasts
yes
lymph nodes near clavicle
subclavian nodes
upper right quadrant drains into the
right brachiocephalic vein
drain into the right brachiocephalic vein via the
right lymphatic duct
superior vena cava splits into
brachiocephalic veins
brachiocephalic veins split into (2)
subclavian veins and internal jugular veins
majority of the body drains into the
left brachiocephalic vein
what drains into the left brachiocephalic vein
thoracic duct
thoracic duct ends in the
cisterna chyli
where is cisterna chyli located
inferior to diaphragm
what lymphatics drain from the upper half of the body (3)
jugular trunk, subclavian trunk, bronchomediastinal trunk
what % of lymphatics in the cisterna chyli
20%
what drains lateral to the cisterna chyli
intestinal trunks
intestinal lymphatic trunks (3)
coeliac, superior mesenteric, inferior mesenteric
what drains inferior to the cisterna chyli
lumbar trunk
the lumbar trunk drains into theat drains into the lumbarr trunk
common iliac trunk
lymphatic lumbar trunks (3)
posterior abdominal wall, pelvis, lower limb
what drains into the common iliac lymphatic trunk (2)
external iliac trunk and internal iliac trunk
where is breast cancer usually derived from
glandular epithelium in lobules
what does cancer typically look like on a mammogram
jagged mass
in which patients is it hard to identify breast cancer
dense breast mammograms
what can breast cancer damage
suspensory ligaments (shortens)
how does damaged suspensory ligaments typically present (3)
thick skin, dimpled skin, inverted nipple
what happens to breast cancer once it enters lymphatic vessels before entering venous system
passes through lots of lymph nodes
when cancer lodges in lymph nodes
metastases
where are metastases from breast cancer easily palpated
axilla
does lack of axilla metastases rule out metastatic cancer
no