10/22 Thoracic Wall and Pleural Cavities - Carter 2017 (Completed) Flashcards
What separates the thorax from the abdomen?
respiratory diaphragm
how high does the dome of the diaphragm rise?
5th intercostal space - right side
6th intercostal space - left side
What does the manubrium articulate with?
clavicles at the sternoclavicular joint
1st ribs
2nd ribs at sternal angle
sternum body at sternal angle
What ribs does the body of the sternum articulate with?
ribs 2-7
false ribs 8 - 10
What joint allows for hinge-like movement of the sternum body anteriorly and posteriorly allowing for expansion of the thoracic cavity?
manubriosternal joint
At what vertebral level is the Xiphisternal joint?
T8
What makes true ribs true? How many are there?
ribs 1 - 7
their costal cartilages connect directly to the sternum
What makes false ribs false? How many are there?
ribs 8 - 10
their costal cartilages connect indirectly to the sternum
What are floating ribs? How many are there?
ribs 11 - 12
do not attach to the sternum
How is a rib numbered?
the rib attached to the superior costal facet of the vertebrae will share the same number
This rib will also attach to the same transverse process of the vertebra it shares a number with
This rib will attach to the inferior costal facet of the vertebrae above (superior)
What is the joint between a rib and the facet of a vertebra?
costovertebral joint
What is the joint between the tubercle of a rib and the transverse process of a vertebra
costotransverse joint
What is the ordering of the intercostal muscles superficial to deep?
External intercostals
internal intercostals
innermost intercostals
What is the origin and insertion of the external intercostals?
O –> tubercles of a superior rib
I –> costal cartilage/rib border of the inferior rib
What muscle is insertion of the external intercostals continuous with?
external obliques
what is the action of the external intercostals vs the internal intercostals?
external intercostals –> rib elevation
Internal intercostals –> rib depression
What is the origin and insertion of the internal intercostals?
O –> lateral border of sternum
I –> mid-axillary line of ribs
What is the origin and insertion of the Innermost intercostals?
O –> angle of the ribs
I –> anterior to mid-axillary line
What is the fiber direction for the three layers of intercostals?
External intercostals –> inferomedial
Internal intercostals –> inferolateral
Innermost intercostals –> inferomedial
What is the origin and insertion of the Transversus thoracic?
O –> posterior surface of sternum & xiphoid process
I –> costochondral junction of ribs 3 - 6
What is the action of the transversus thoracis?
depression of the ribs
What innervates the three intercostal muscles and the transversus thoracic muscle?
ventral primary rami (T1 - T11)
motor branches innervate muscle
sensory branches innervate lateral and anterior skin
What supplies intercostal spaces 1 & 2?
supreme thoracic a
supreme intercostal a
What supplies intercostal spaces 3 - 11?
posterior intercostal a
What supplies the skin overlaying intercostal spaces 1 - 6 and the thymus?
anterior intercostal a
what supplies the anterior intercostal spaces 7 - 9?
musculophrenic a
What pleura lines the superior diaphragm?
diaphragmatic pleura
What pleura covers the surface of the lungs?
visceral pleura
Where is the right and left costodiaphragmatic recess found?
on the right and left side of the thorax below their respective lungs, but above the diaphragm
Where is the costomediastinal recess?
on both sides of the heart, but above the diaphragm
Why are the pleural recesses clinically important?
these are empty spaces that can be occupied by bacteria during infection
What pleura lines the internal surface of the thorax?
parietal pleura
What structure contains the lungs?
Pleural sacs
What pleura covers the ribs and intercostal spaces?
costal pleura
what provides sensory for pain and irritation to the costal pleura and the periphery of the respiratory diaphragm?
intercostal nerves
What provides sensory for pain and irritation to the mediastinal pleura and the diaphragmatic pleura?
phrenic nerves
What lies directly below the right side of the respiratory diaphragm?
The liver
What is the angle of Louie?
Synonymous with sternal angle
Where will you find the vein, artery, and nerve for the intercostals?
Between the inner intercostals and innermost intercostals
What does the Internal Thoracic a (mammary a) divide into?
Musculophrenic a (intercostal a 7-9)
Superior epigastric a
