01-06: Thorax, Lungs, Pleura Flashcards
Which ribs are true ribs?
Ribs 1 & 2
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What does the manubrium of the sternum articulate with?
Rib 1 and the Body of the Sternum
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Which part of the rib articulates with the bodies of vertebrae?
Head
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Which muscle is considered the primary muscle of respiration (breathing)?
Diaphragm
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Where do the ribs articulate anteriorly?
Costal cartilage
Where do the ribs articulate posteriorly?
Vertebrae
3 parts of the Sternum
- Manubrium
- Body
- Xiphoid
Location of Superior Thoracic Aperture
- where the first rib articulates with T1 and the Manubrium of Sternum
- Root of head and neck
What enters the Superior Thoracic Aperture?
- Vagus nerve
- Parasympathetic cranial nerves
- Parts of Cervical Plexus (Phrenic nerve)
What exits the Superior Thoracic Aperture?
- Great Vessels (Subclavian Artery, Brachiocephalic trunk,…)
- Jugular structures going into Subclavian veins and SVC
Location of Inferior Thoracic Aperture?
- Floating ribs
- Costal margin
- T12
- Xiphoid process of Sternum
What completely covers the Inferior Thoracic Aperture?
Diaphragm
What is above the Diaphragm and directly in the middle of the Thoracic Cavity?
Mediastinum
What is lateral (surrounds) the mediastinum?
Pleural Cavity
4 parts of the Mediastinum?
- Anterior
- Posterior
- Superior
- Inferior
What region are the ribs located in?
Thoracic only
What do the ribs articulate with?
Sternum and Vertebrae
Atypical ribs
Ribs 1, 2, 11, 12
-Weird shape or doesn’t articulate with anything
True (Vertebrocostal) ribs
Ribs 1-7
False (Vertebrochondral) ribs
Ribs 8-10
Floating ribs
Ribs 11-12
4 parts of Vertebral End of Typical ribs
- head
- neck
- tubercle
- angle
1 part of Middle End of Typical ribs
-Body (shaft)
Sternal End of Typical ribs
articulates directly with sternum, costal cartilage, or sits in fascia
Articulation spot for neck muscles on Rib 1
Scalene tubercle and ridge
2 Grooves on Rib 1
- Subclavian vein
- Subclavian artery
Because it’s right at Superior Thoracic Aperture
Tuberosity on Rib 2
For Serratus Anterior
of facets on heads of Rib 1 compared to Rib 2
- Rib 1 = Single facet on head
- Rib 2 = Two facets on head (articulate with Inferior and Superior demifacets on vertebrae)
Ribs with no sternal end
Ribs 11 & 12
Rib with blunt sternal end
Rib 8
Tubercle of Rib 8 articulation
Transverse Process Facet
Which ribs don’t have tubercles?
Floating ribs
What costal notch articulates with the Xiphoid process?
7th Costal Notch
What runs through costal groove? (On inside inferior margin of the rib)
Intercostal artery and nerve
Shaft of rib is attachment site for what?
Attachement site for intercostal muscles
Tubercle of rib articulates with
Transverse process of vertebra of same number as rib
2 Secondary Cartilaginous Joints
- Intervertebral joint
- Manubriosternal joint
3 Synovial Plane Joints
- Costovertebral joints of head of ribs
- Costotransverse joints
- Sternocostal (2nd-7th)
What is the main named ligament of ribs?
Radiate ligament
Movement of thoracic skeleton during FORCED INSPIRATION
Upward
Movement of thoracic skeleton during FORCED EXPIRATION
Downward
Movement of diaphragm during FORCED INSPIRATION
Downward - flattened dome
Movement of diaphragm during FORCED EXPIRATION
Upward - tall dome
What muscles helps move the diaphragm upward and downward?
Intercostal muscles
Intercostal muscles
- Internal intercostal (Sup-Ant»_space; Inf-Post)
- External intercostal (Sup-Post»_space; Inf-Ant)
- Innermost intercostal
- Serratus posterior superior
- Serratus posterior inferior
Diaphragm innervation
phrenic nerve (C3-C5 of cervical plexus)
Most posterior hole in diaphragm?
Aortic Hiatus
Hole in diaphragm superior to Aortic Hiatus?
Esophageal Hiatus
Most anterior hole in diaphragm?
Caval opening (for Inferior Vena Cava)
Ligament at apex of Aortic Hiatus?
Median Arcuate Ligament
- Anchors diaphragm to posterior wall
- Forms Left and Right Crus
Anterior Longitudinal Ligament
continuous with Right and Left Crus
C3,4,5
keeps the diaphragm alive
What happens to the diaphragm when breathing in?
contracts
What happens to the diaphragm when breathing out?
relaxes
What 4 muscles ELEVATE the ribcage?
- External intercostal muscles
- Innermost intercostal muscles
- Levator costarum
- Serratus posterior superior
What 4 muscles DEPRESS the ribcage?
- Internal intercostal muscles
- Transversus thoracis
- Subcostal muscles
- Serratus posterior inferior
3 Primary cartilaginous joints
- 1st Sternocostal
- Costochondral
- Xiphisternal
What 2 arteries supply blood to the lungs?
- Left bronchial a. (from aorta)
- Right bronchial a. (from intercostal arteries, aorta, or Left bronchial a.)
What 2 veins drain the lungs?
- Bronchial veins
- Pulmonary veins
What do the bronchial veins drain into?
the azygos system
Where does the right bronchial vein drain?
azygos vein
Where does the left bronchial vein drain?
Accessory hemiazygos vein or Intercostal vein
What are the 4 sympathetic pathways?
- Spinal nerve pathway
- Postganglionic sympathetic nerve pathway
- Splenic nerve pathway
- Adrenal medulla pathway
What is the sympathetic innervation of the lungs?
Postganglionic sympathetic nerve pathway
via Right and Left Pulmonary Plexuses
What is the parasympathetic innervation of the lungs?
Vagus nerve
via Right and Left Pulmonary Plexuses