Thoracic cavity Flashcards
Borders of thoracic cavity?
Superior thoracic aperture:
- post: T1
- late: 1st rib + cartilage
- ant: manubrium
Inferior thoracic aperture:
- Post: T12
- Posterolat: 11-12 rib
- Antlat: joined costal cartilages 7-10
- Ant: xiphoid process
How many of the ribs does sternum articulate with?
7, 1-7
How many ribs? true, false etc
12 ribs,
7 true,
8-10 false,
11-12 floating (no cartilage
Joints of thoracic cavity?
sternocostal,
costovertebral,
interchondral
Costovertebral joints
- Joint head of rib
b/w head of rib and with vertebral
ligament: Radiate(stellate) and intraarticular lig of head of rib. - Costotransverse joint
b/w tubercle of rib and transverse costal facet
lig: sup and lat costotransverselig
Sternocostal joint
b/w cartilage of 2-7 rib and costal noches on sternum
synovial joint
lig: radiate and intra-artcular sternocostal lig.
Interchondral joint
B/w cartilages of 6-9 rib
muscles of thoracic wall
external, internal and innermost, muscles
direction of fibers
external: obliquely ant-inf
internal: superioant
innermost: same as internal
where is intercostal space?
b/w internal and innermost muscles, where nerves and vessels pass
Fascia of thoracic wall
- Pectoral
- claviopectoral, comes continyus with axillary fascia forming suspensoryligament of axilla.
- Endotoracic ( reinforces lung cupula as suprapleural membrane or sibsons fascia.)
nerves of thoracic wall
Thoracic spinal nerves,
- Post rami, -> T1-T12for dorsal thoracic region
- Ant rami-> T1-T11, the 12 is called subcostal nerve
Arterial supply of thoracic wall
Post intercostal a.( thoracic aorta)
Ant intercostal a. (internal thoracic a.)
superior thoracic and lateral thoracic a. ( axillary a.)
Origin and insertion of external intercostal?
o: inf margin of sup rib
i: superior margin of inf rib
They attatch to sternum as external intercostal membrane
origin insertion of inernal intercostal oblique?
O: lateral edge of inf rib
i: medially upward into inf margin of sup ribs
mammal region
Border: med :linea parasternalis lat: plica axillaris anterior b/w 3-7 ribd mamillia 4 IC space
Layer:
- 12-15 lobes
- corpus adiposum
- fascia pectoralis superficial
- mectoralis minor and major-
- deep pectoral fascia
- body wall
Content:
- mammary a.
- thoracic interna a.
- intercostal a.
- thoracoacromial a.
skin innervation: supraclavicular n.
gland: intercostal n.
Thoracic outlet syndrome?
there is compression of the nerves, arteries, or veins in the passageway from the lower neck to the armpit bt the scalene ant and medius muscle.
level thoracic aorta?
T3-T12
Level of arch of aorta?
T2
branches of thoracic aorta?
- Posterior intercostal a.
- superior phrenic a.
- bronchial
- esophegeal
- mediastinal
- pericardiac
bifurcation of trachea?
T4
level of hilum of lung
th 5-6
