Thorax and breathing Flashcards
What does the thorax include
Sternum
Costal cartilages
Ribs
Thoracic vertebrae
Structures they enclose
Why do we have a thorax
Breathing
What are the two openings of the thorax
Inferior thoracic aperture
Superior thoracic aperture
Where is the superior thoracic aperture
At root of neck and in continuity with the neck
What are the three compartments of the thorax
Mediastinum
Right and left pleural cavities
What closes the inferior thoracic aperture
Diaphragm
What is the pectoral girdle
Bones which connect to the arm on each side
What are the false ribs
Ribs 8,9,10 - hook onto cartilage and then join to sternum (not directly attached)
Why are false ribs more prone to trauma/fracture
Don’t adjoin to intercostal cartilages
What is the first branch of the aorta
Pulmonary arteries
What is the structure of the diaphragm
Musculotendinous structure
Muscle fibres arise radially from the costal margins and converge to insert into the central tendon
Muscle ‘dome-shaped’ on each side but is higher on the right than the left, due to the position of the liver beneath
What muscle is present in the diapragm
Skeletal
What fibres does the phrenic nerve contain
Motor and sensory fibres
What is the costodiaphragmatic recess
A larger of recesses found between the costal and diaphragmatic pleura of right and left pleural cavities. Provide space for the lungs to fill, but also fluid can accumulate in these.
What is the space between the ribs
Intercostal space
What are floating ribs
11,12
These are short ribs that do not attach to the sternum at all.
Instead, their small costal
cartilages terminate within the musculature of the lateral abdominal wall.
Where are the intervertebral discs
Lies between adjacent vertebrae
What is the costochondral joint
Connection between the costal cartilage and the ribs
What can be used for chest drain insertion
Sternal angle (equates to where
the second rib is) useful
for counting ribs inferiorly and laterally
What is the pectoral girdle
Bones which connect to the arm on each side – this is the clavicle (collar bone) and the scapula (shoulder blade)
What is the superior limit of the thorax
1st thoracic vertebra
1st rib
Manubrium of sternum
What forms the inferior limit of the sternum
Diaphragm
What is the mediastinum
Central component of the thoracic cavity, surrounded by the left and right pleural sacs