Anatomy: Thorax Flashcards
What are the three parts of the sternum?
Manubrium
Body
Xiphoid process
What is another name for the sternal angle?
Angle of Louis
What is the sternal angle used as a landmark for?
Apex of heart
Which rib attaches at the level of the sternal angle?
2nd rib
How can you externally find the sternal angle?
3 fingers below the jugular notch
Which ribs are true ribs?
1-7
Which ribs are false ribs?
8-12
Which ribs are floating ribs?
11-12
Why are ribs 11 and 12 called ‘floating’?
There is no costal cartilage to connect to the sternum
What is the difference between true and false ribs?
False ribs do not have individual cartilage that attaches it to the sternum
What are the borders of the superior thoracic aperture?
T1
Margins of 1st rib
Manubrium
What defines the border of the inferior thoracic aperture?
Diaphragm
What are the symptoms of thoracic outlet syndrome?
Neck, shoulder and arm pain
Numbness
Impaired circulation to UL
What is the jugular notch used to landmark?
Level of great vessels
What is the vertebrate level of the jugular notch?
T1/T2
What is the vertebrate level of the sternal angle?
T4
What is the vertebrate level of the the top of the diaphragm/top of xiphoid process?
T9
What is the vertebrate level of the posterior attachment of the diaphragm?
T12
Where are the pleural cavities relative to the mediastinum?
Pleural cavities are on either side of the mediastinum
What is the relative location of the vessels and nerve between the ribs?
Vein is superior
Artery is middle
Nerve is inferior
What do the intercostal vessels and nerves run between?
Internal intercostal muscles
Innermost intercostal muscles
What is another name for the internal thoracic artery?
Mammary artery
What artery is often used in coronary bypass surgery?
Internal thoracic artery
Where does the internal thoracic vein drain into?
Subclavian vein
What are the two branches of the internal thoracic artery?
Musculophrenic artery
Superior epigastric artery
Which direction are the external intercostal muscle fibres?
Inferiorly and medially
What direction are the internal intercostal muscle fibres?
Inferiorly and laterally
How do the external intercostal muscles attach to the sternum?
Membrane
How do the internal intercostal muscles attach to the sternum?
Muscles attach directly
What direction are the innermost intercostal muscles fibres running?
Interiorly and laterally
Which of the intercostal muscles contract for inspiration?
External intercostals
Which of the intercostal muscles contract for expiration?
Internal and innermost intercostals
What muscles are active in passive breathing?
External intercostals
Internal intercostals
Diaphragm
What muscles are active in exerted breathing?
Any muscles that are attached to the ribs and or sternum
How many openings are there in the diaphragm?
3
What is the highest/first opening in the diaphragm called? What structures pass through?
T8 caval
IVC, R phrenic nerve
What is the middle opening in the diaphragm called? What structures pass through?
T10 esophageal
Esophagus, vagus nerve
What is the lowest opening in the diaphragm called? What structures pass through?
T12 aortic
Aorta, azygos vein, hemiazygos vein, thoracic duct
What do the internal thoracic, musculophrenic, pericardiophrenic, aorta and inferior phrenic arteries all supply?
Diaphragm
What nerve provides the motor innervation for the diaphragm?
Phrenic
What nerves provide the sensory innervation for the diaphragm?
Phrenic and lower intercostals
Other than the phrenic nerve, what other area of the body is innervated by ventral rami from C4 and 5 nerve roots?
Shoulder region
Why could there be referred pain from the heart or diaphragm to the shoulder region?
Because the ventral roots C4 and 5 supply the phrenic nerve and sensory to the shoulder region
What ribs does the breast cover?
Ribs 2-6
Where do the breasts develop?
Along a milk/mammary line
What is the purpose of the retromammary space?
Allows the breast to move freely
What are the suspensory ligaments in the breast tissue called?
Ligaments of Cooper
What is the purpose of suspensory ligaments in the breast?
Divdie lobes
Where are lactiferous glands found in the breast tissue?
Lobules
Where do the lobules drain into in breast tissue?
Lactiferous duct
Where does the lactiferous duct drain into in breast tissue?
Lactiferous sinus
What are the four arteries that supply the breast tissue?
Internal thoracic/mammary artery
Intercostal arteries
Thoracoacromial trunk
Lateral thoracic artery
Rather than veins, how is the breast tissue drained?
Lymphatic system
Where are the lymph nodes located that drain the breast tissue?
Axilla
The visceral pleura on the lungs extends down to which intercostal space anteriorly?
6th
The visceral pleura on the lungs extends down to which intercostal space laterally?
8th
The visceral pleura on the lungs extends down to which intercostal space posteriorly?
10th
The parietal pleura on the lungs extends down to which intercostal space anteriorly?
8th
The parietal pleura on the lungs extends down to which intercostal space laterally?
10th
The parietal pleura on the lungs extends down to which intercostal space posteriorly?
12th
What structure does the trachea push into during development to form the pleura?
Coelomic cavity
At what point is the visceral pleura continuous with the parietal pleura surrounding the lungs?
Pulmonary ligament
What are the four types of parietal pleura that surrounds the lung?
Costal
Diaphragmatic
Mediastinal
Cervical
What is the recess between the ribs and the diaphragm of the lung pleura called?
Costodiaphragmatic recess
Between which ribs would you need to puncture to enter the costodiaphragmatic recess?
Between the 8th and 10th intercostal spaces laterally
Where would you find the costomediastinal recess relative to the heart?
Anterior to the heart
Which side has a larger costomediastinal recess?
Left side
Which rib does the upper lobe of the lung extend down to (level of horizontal fissure)?
Rib 6
What is a open pneumothorax?
Hole in the pleura remains open on inspiration and expiration
What is a tension pneumothorax?
Hole in the pleura closes on expiration
Which of the pneumothorax can you expect to see a shift of the mediastinum during inspiration?
Both open and tension
Which o the pneumothorax can you expect to see a shift of the mediastinum during expiration?
Tension
Which of the pneumothorax is the most dangerous?
Tension
What separates the upper and middle lobes of the lung?
Horizontal fissure
What serapes the middle and lower lobes of the lung?
Oblique fissure
How many lobes of the lung does the left side have?
2
How many lobes of the lung does the right side have?
3
What are the five structures passing through the hilum of the left lung?
Pulmonary artery Bronchus Pulmonary vein Bronchial artery Lymph nodes
What are the five structures passing through the hilum of the right lung?
Pulmonary artery Bronchus Pulmonary vein Bronchial artery Lymph nodes
Which lung is the pulmonary ligament on?
Both!
Which lung hilum has more openings?
Right
Why does the hilum have more openings than the left?
The right primary bronchi branches earlier than the left
Which opening in the hilum of the lung is most superior?
Pulmonary artery
Which opening in the hilum of the lung is most posterior?
Bronchi
Which opening in the hilum of the lung is most inferior?
Pulmonary vein
Which muscle wraps around the trachea in incomplete rings ?
Trachealis
What is the function of the trachealis muscle?
Prevents trachea compression with swallowing food
Which of the primary bronchi is a swallowed object most likely to get stuck in?
Right
What are most swallowed objects in the right lung?
Right primary bronchi is wider and more vertical with the trachea
What is the ridge called that separates the right and left primary bronchi?
Carina
How many secondary bronchi are on the right side?
3
How many secondary bronchi are on the left side?
2
How many tertiary bronchi are in the lungs?
8-10
What are lobar bronchi?
Secondary bronchi
What are segmental bronchi?
Tertiary bronchi
What is a bronchopulmonary segment?
Group of tertiary bronchi
What is in the anterior mediastinum?
Fat
Lymph nodes
Thymus
When does the body have a thymus gland?
Only in development
What is the thymus gland replaced by?
Fat
What produces T cells in adults after the thymus gland degenerates?
Bone marrow
What is in the middle mediastinum?
Heart
Pericardium
Phrenic nerves
What is in the superior mediastinum?
SVC Brachiocephalic artery Brachiocephalic vein Aorta (and branches) Pulmonary trunk Vagus nerve Recurrent laryngeal Phrenic nerve