Thorax Flashcards
What are the components of the thoracic wall? Functions?
skin, subcutaneous tissue, ribs, intercostal nn.
protection, respiration, muscle attachment
What ribs are true? False? floating?
1-7
8-10
11 & 12
What are the three rib joints and what are the classifications?
costovertebral
costotransverse
sternocostal
plane/gliding
What are the unique properties of the first rib?
Tubercle for anterior scalene
groove for subclavian a. anterior, groove for subclavian v. posterior
Dermatome locations
T4
T6
T10
nipple
skin over xiphoid process
umbilicus
External intercostal attachments
Rib to rib oriented superior-lateral to inferior-medial
AKA
Down and in
Actions of external intercostals
Elevation of the ribs
Innervation of external intercostal
Intercostal nerve
Internal intercostal and innermost intercostal attachments
Rib to rib oriented superior-medial to inferior-lateral
AKA
Down and out
Actions of internal & innermost intercostal
Depression of ribs
Innervations of internal and innermost intercostal
Intercostal nerve
Transversus thoracis attachments
Posterior sternum to costal cartilages
Transversus thoracis actions
Depression of the ribs
Innervation of Transversus thoracis
Intercostal nerve
Diaphragm attachments
xiphoid process, inner surface of lower ribs & costal cartilages, lumbar vertebrae via the crura
To
Central tendon
Actions of diaphragm
inspiration ( negative thoracic pressure = inferior displacement “flattening”)
Peripheral innervation of diaphragm
Segmental innervation
Phrenic nerve
C3-C5
The intercostal nerves, arteries, and veins are positioned ____ to the internal intercostal muscles
Deep
The intercostal veins, arteries, and nerves are all positioned directly ________ to the ribs
Inferior
The internal thoracic artery is positioned _____________ to the first six costal cartilages
Posterior (deep)
