Overview of the Thorax Flashcards
Boundaries of the thoracic cavity
Posterior border: Spine
Anterior border: sternum
Inferior border: diaphragm
Superior border: superior thoracic aperture
Components of thoracic wall
Skin
Subcutaneous tissue
Ribs
Intercostal muscles
Functions of thoracic wall
Protection
Respiration
Muscle attachment
Three types of ribs
True (1-7)
False (8-10)
Floating (11 &12)
Name landmark A
Superior facet
Name landmark B
Inferior facet
Name landmark C
Head
Name landmark D
Neck
Name landmark E
Costal angle
Name landmark H
Costal groove
Name landmark J and its two subsets
Tubercle: articular part, nonarticular part
Rib joints and their synovial classifications
Costovertebral: head of rib to vertebral body (plane)
Costotransverse: costal tubercle to transverse process (plane)
Sternocostal: sternum to costal cartilage (plane)
Name landmark A
Groove for subclavian vein
Name landmark B
Groove for subclavian artery
Name landmark F
Tubercle for anterior scalene
Name landmark A
Clavicular notch
Name landmark B
Jugular notch
Name landmark C
Manubrium
Name landmark D
Sternal angle (manubriosternal joint)
Name landmark E
Body of sternum
Name landmark H
Xiphoid process
Name landmark I (red numbers)
Costal notches
External intercostal attachments
from… rib to rib oriented from supero-lateral
to… infero-medial
External intercostal actions
elevation of ribs
External intercostal innervation
intercostal nerve (segmental)
Internal & innermost intercostal attachments
from… rib to rib oriented superior-medial
to… inferior-lateral
Internal & innermost intercostal actions
depression of ribs
Internal & innermost intercostal innervation
intercostal nerve (segmental)
Transversus thoracis attachments
from… posterior sternum
to… costal cartilages
Transversus thoracis actions
depress ribs
Transversus thoracis innervation
intercostal nerves (segmental)
Diaphragm attachments
from… xiphoid process, inner surface of the lower ribs & costal cartilages, lumbar vertebrae via the crura
to… the central tendon
Diaphragm actions
inspiration (negative thoracic pressure by inferior displacement)
Diaphragm innervation
PNS: phrenic nerve
CNS: C3-5
Rami communicans relationship to sympathetic chain ganglia and intercostal nerves (include axons)
White: preganglionic sympathetic axons and sensory axons
Gray: postganglionic sympathetic axons and sensory axons
Naming convention of the intercostal nerves
Named for the rib they are under (which rib they inhabit the costal groove)
Name which thoracic nerve innervates the green star (nipple)
T4
Name which thoracic nerve innervates the blue star (xiphoid process)
T6
Name which thoracic nerve innervates the purple star (umbilicus)
T10
What types of innervation (action) does the phrenic nerve do?
sensory, postganglionic, and motor
White rami communicans
Carry preganglionic sympathetic axons to sympathetic chain ganglia and abdominal ganglia
Sensory axons from viscera to spinal cord
Gray rami communicans
Carry postganglionic sympathetic axons from the sympathetic chain to the spinal nerves for distribution through the dorsal and ventral rami
Sensory axons from the viscera to the spinal cord
Draw thoracic arterial supply
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Draw thorax venous drainage
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Draw thorax lymphatic drainage
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