Anterior Thoracic Wall Flashcards
True ribs
1 through 7
False ribs
8, 9, 10
represents the boundary between the neck and thorax
thoracic outlet
bounded by T1, rib 1, and manubrium
Inferior Thoracic Aperture bounded by
body of T12, costal margin, xiphisternal joint
Sternum- parts and ossification centers
Manubrium, Body, Xiphoid Process
6 separate ossification centers, most fuse around age 25
Sternal Angle- name and type of joint
Manubriosternal Joint: symphysis
what does Symphysis mean when talking about ribs
secondary cartilaginous joint; bones united by fibrocartilage
Synchondrosis means what when talking about ribs
primary cartilaginous joint; bones united by hyaline cartilage – usually temporary and then converts to bone
Sternal angle landmark: T4-T5 intervertebral disc what is here
attachment of 2nd rib: 2nd intercostal space bifurcation of trachea boundary between inferior and superior mediastinum SVC enters pericardium superior border of pulmonary trunk
what is at the level of t3 t4
SVC
aortic arch
trachea
esophagus
what is at the level of t6 t7
pulmonary trunk ascending aorta descending aorta right/left pulmonary artery right/left main bronchus
physical features of a typical rib
Head and neck Tubercle Body and angle Costal cartilage Costal groove Facets for articulation with vertebrae
Facets on the head of the rib articulate with the body of
corresponding vertebra, and the body of the vertebra above.
A facet on the tubercle of the rib articulates with the
tip of corresponding transverse process.
The intercostal space has muscles. name them superficial to deep
External Intercostal Muscles
Internal Intercostal Muscles
Innermost Intercostal Muscles
where do the External intercostals muscles end?
at the costochondral junction (go from vertebrae to costochondral junction)
External intercostals ________ ribs during forced inspiration
elevate
Interchondral (anterior, medial) portions _________ the ribs during forced expiration
elevate
Internal intercostal muscles are incomplete where
posteriorly, where they are replaced by the internal intercostal membrane
The innermost intercostals are membranous where
both anteriorly and posteriorly.
nuerovasculature in the ribs run through what space
space between internal and innermost muscles
Anterior intercostal arteries are branches of the
internal thoracic segmentally and musculophrenic arteries when the internal thoracic splits
dermatome at the level of the nipple
T4
dermatome at the level of the belly button
T10
What are the floating rib(s)
11 and 12
