Thoracic cavity

Question 1

Borders of thoracic cavity?

Answer 1

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

Question 2

How many of the ribs does sternum articulate with?

Answer 2

7, 1-7

Question 3

How many ribs? true, false etc

Answer 3

12 ribs,
7 true,
8-10 false,
11-12 floating (no cartilage

Question 4

Joints of thoracic cavity?

Answer 4

sternocostal,
costovertebral,
interchondral

Question 5

Costovertebral joints

Answer 5

• 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

Question 6

Sternocostal joint

Answer 6

b/w cartilage of 2-7 rib and costal noches on sternum
synovial joint
lig: radiate and intra-artcular sternocostal lig.

Question 7

Interchondral joint

Answer 7

B/w cartilages of 6-9 rib

Question 8

muscles of thoracic wall

Answer 8

external, internal and innermost, muscles

Question 9

direction of fibers

Answer 9

external: obliquely ant-inf
internal: superioant
innermost: same as internal

Question 10

where is intercostal space?

Answer 10

b/w internal and innermost muscles, where nerves and vessels pass

Question 11

Fascia of thoracic wall

Answer 11

• Pectoral
• claviopectoral, comes continyus with axillary fascia forming suspensoryligament of axilla.
• Endotoracic ( reinforces lung cupula as suprapleural membrane or sibsons fascia.)

Question 12

nerves of thoracic wall

Answer 12

Thoracic spinal nerves,

• Post rami, -> T1-T12for dorsal thoracic region
• Ant rami-> T1-T11, the 12 is called subcostal nerve

Question 13

Arterial supply of thoracic wall

Answer 13

Post intercostal a.( thoracic aorta)
Ant intercostal a. (internal thoracic a.)
superior thoracic and lateral thoracic a. ( axillary a.)

Question 14

Origin and insertion of external intercostal?

Answer 14

o: inf margin of sup rib
i: superior margin of inf rib

They attatch to sternum as external intercostal membrane

Question 15

origin insertion of inernal intercostal oblique?

Answer 15

O: lateral edge of inf rib
i: medially upward into inf margin of sup ribs

Question 16

mammal region

Answer 16

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.

Question 17

Thoracic outlet syndrome?

Answer 17

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.

Question 18

level thoracic aorta?

Answer 18

T3-T12

Question 19

Level of arch of aorta?

Answer 19

T2

Question 20

branches of thoracic aorta?

Answer 20

• Posterior intercostal a.
• superior phrenic a.
• bronchial
• esophegeal
• mediastinal
• pericardiac

Question 21

bifurcation of trachea?

Answer 21

T4

Question 22

level of hilum of lung

Answer 22

th 5-6