Mediastinum Flashcards Preview

Cardiovascular anatomy > Mediastinum > Flashcards

Flashcards in Mediastinum Deck (19)
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1

What is the mediastinum bounded by and what it includes

Bounding: superior thoracic apeture (thoracic inlet), diaphragm, sternum, throacic verterbral bodies, pleural cavities
Includes: heart, great vessels, trachea, oesophagus

2

Superior mediastinum where

From manubriosternal joint and lower T4 level to superior thoracic aperture

3

Major vessels in superior mediastinum

Arteries=brachiocephalic trunk, subclavian artery, right common carotid, left common carotid left subclavian, aortic arch
Veins: right and left branchiocephalic veins, right and left internal jugular, right and left subclavian

4

Inferior mediastinum where

manubriosternal joint to diaphragm.

5

Inferior mediastinum composition

anterior (fat and thymus gland remnant), middle (fibrous pericardium and heart) and posterior compartments (descending thoracic aorta, oesophagus, thoracic duct, azygos vein). Sympathetic trunks run alongside vertebral bodies

6

Path and function of vagus nerve

path: behind left main bronchus->behind heart->in front of descending thoracic aorta->hiatus
function: supplies oesophagus and trachea

7

Sympathetic contribution oesophagus and trachea level

T6-10

8

oesophagus begins where

C6

9

cricoid cartilage in larynx where

C6

10

Is the carnia in the mediastinum

No

11

Constrictions of oesophagus

Criocid cartilage C6, aortic arch T4, left main bronchus T5, left atrium T6-10, oesophageal opening T10

12

How are oesophageal muscles controlled

By the vagus. Upper part: voluntary somatic, somatic motor neurone.
Lower part: smooth, involuntary autonomic parasympathetic

13

Azygos system and levels of drainage

Hemiazygos vein drains to azygos Y7/8
Accessory hemiazygos vein drains to azygos T6/7

14

What muscle separates subclavian artery+vein

Serratus anterior

15

Phrenic nerve path

through thoracic inlet->heart border->hemidiaphragm

16

Phrenic and vagus in relation to lung root

Phrenic= anterior, vagus=posterior

17

Comment on C43-5

They are sensory to structures it is corssing e.g. pericardium and parietal pleura. C4 is the most important motor

18

Autonomic supply to lung

Sympathetic: T1-5 afferents of pain and vasoconstriction
Parasympathetic: Vagus CN X bronchoconstriction of airways

19

Plexuses in the chest

Pulmonary-Sympathetic from T1-5, parasympathetic from vagus
Cardiac-sympathetic T1-4, parasympathetic from vagus
Oesophageal-sympathetic T2-6, parasympathetic from vagus