Section 1 Flashcards
3 Divisions of hypaxial muscles
1) Body wall mm
2) Limb mm
3) Prevertebral mm
Body wall mm
Neck: scalene
Thorax: ext. intercostals
int. intercostals
scattered deep bits
Abdomen: Ext. obliques
Int obliques
Transverse abdominis
Ext. intercostal muscles are deficient where?
Anteriorly
Internal intercostals are deficient where?
posteriorly
What makes up “deep scattered bits”
Posteriorly: Subcostal m fibers
Laterally: innermost intercostals
Anteriorly: Transverse thoracis m.
Subcostal muscle fibers span how many spaces?
2
Innermost intercostals span how many spaces?
1
Transverse thoracis muscle span how many spaces?
Several
How many posterior intercostal arteries are there?
11
Posterior intercostal arteries 1+2 come from?
costocervical trunk
Posterior intercostal arteries 3-11 come from?
Aorta
Intercostal N span from ?
T1-T11
Subcostal N located at?
T12
Sympathetic trunk input
T1-L2
Through white rami comunicans
Anterior intercostal artery stops where?
9th intercostal space
Where internal thoracic artery split?
At 6th intercostal space
Superior mediastinum extends from __ to __
T1-T4
Manubrium to Vertebrae
Rib one acts as superior border
Superior mediastinum contains ?
Remnants of thymus gland
brachiocephalic veins
SVC
Aortic arch and branches
Lower trachea
phrenic nn
vagus nn
Left recurrent laryngeal n
Thoracic duct
Anterior inferior mediastinum
- Smallest part of mediastinum
- Anterior limit is sternum
- Posterior limit is ant. surface of fibrous pericardial sac
- Contains:
Fat
Sternopericardial ligaments
internal thoracic aa and vv
lymph nodes
Middle Inferior mediastinum
- Limits are walla of fibrous pericardial sac
- Phrenic nn lie b/w fibrous pericardial sac and mediastinal pleura
- Contains:
heart
roots of great vessels
Posterior inferior mediastinum
- Posterior limit T4-T12
- Anterior limit is post. surfce of fibrous pericardial sac
- Contains:
Esophagus
vagus nn
thoracic duct
azygos venous system
thoracic aorta
sympathetic trunks
splanchnic nn
lymph nodes
Types of parietal pleura
Mediastinal P
Diaphragmatic P
Costal P
Costomediastinal recess
costodiaphragmatic recess
