Thoracic Cavity/Pleural Cavity

Question 0

Thoracic Cavity

Answer 0

cavity within thorax. from thoracic inlet to cranial aspect of diaphagm

Question 1

Thorax

Answer 1

body region contained by rib cage

Question 2

Thoracic Inlet

Answer 2

• cranial opening of thoracic cavity
• 1st thoracic vertebra, 1st pair ribs, 1st sternebra (manubrium)
• where trachea, esophogas, etc enter

Question 3

Thoracic Outlet

Answer 3

• caudal opening

- last thoracic vertebraa, last pr ribs, costal arch, xyphoid process (last sternebra)

Question 4

Sternal Ribs

Answer 4

1st 8-9 ribs

directly attach to sternum individually

Question 5

Asternal Ribs

Answer 5

ribs 10-12 in dog.

unite in costal area

Question 6

Floating Rib

Answer 6

13th rib in dogs. not attached to anything.

Question 7

Thoracic m.

Answer 7

attach to rib cage

Question 8

Pleura

Answer 8

serous membrane that lines thoracic cavity

Question 9

Pleural Cavity

Answer 9

within thoracic cavity. lined by pleura

• contains no organs
• has negative pressure
• has closed, potential space/cavity

Question 10

Serous Membrane

Answer 10

• epithelial membrane
• line interior body cavities (thorax = pleura, abdomin = peritoneum)
• secretes serous fluid

Question 11

Serous Fluid

Answer 11

thin, watery fluid.
Purpose = to lubricate
should only be a few drops in the pleural cavities.

Question 12

Negative Pressure in Pleural Cavity

Answer 12

2-5 mmHg.
Purpose = keep lungs against ribs.
(think H2O b/n 2 slides. cant pull apart but can slide across each other)

Question 13

Mediastinum

Answer 13

has no serous fluid in healthy animals.

Question 14

Visceral Pleura

Answer 14

in thoracity cavity it lines the lungs.

aka Pulmonary pleura

Question 15

Parietal Pleural

Answer 15

lines outer walls of thoracic cavity

Type 1: Costal Pleura
Type 2: Mediastinal Pleura
Type 3: Diaphragmatic Pleura

Question 16

Costal Pleura

Answer 16

Portion of pleura against RIB CAGE

bones & intercostal m.

Question 17

Mediastinal Pleura

Answer 17

just comes down middle of thoracic cavity

Question 18

Diphragmatic Pleura

Answer 18

lines the diaphragm in thoracic cavity

Question 19

Connecting Pleura

Answer 19

connects visceral pluera and mediastinal pleura

aka PULMONARY LIG.

Question 20

Types of Pleura

Answer 20

1. Visceral Pleura
2. Parietal Pleura
3. Connecting Pleura

Question 21

Why are the 2 pleural cavities in dogs/cats considered as 1 entity in practice?

Answer 21

The mediastinum is so thin (simple squamous) that what happens in 1 pleural cavity affects the other 1 too. [ex: one fills with air or liquid, it quickly diffuses to the other pleural cavity]. THEREFORE, must treat entire thoracic cavity as 1 entity.