4- Superior Mediastinum Flashcards Preview

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Flashcards in 4- Superior Mediastinum Deck (13)
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1

2 pericardial sinuses

Transverse
Oblique

2

How pericardial sinuses form

Transverse- venous and arterial ends of heart brought together
Oblique- reflection onto the pulmonary of heart

3

Features of right atrium

Crista terminalis
Pectinate
Fossa ovalis
Opening of coronary sinus
Right auricle

4

Features of left atrium

Valve of fossa ovalis
Left auricle

5

Intercostal nerves

11 pairs (+ 1 subcostal)
Mixed (= motor + sensory)
Spinal or segmental nerves
(anterior primary rami)
Supply the intercostal spaces
Lateral cutaneous branch - anterior and posterior
Anterior cutaneous branch - medial and lateral

6

Where do sympathetic trunks receive nerves from

T1- l2

7

Which fibres form splancnic nerves

T5-t12

8

Course of vagus nerves

Cranial nerve X – arise from medulla and leave skull through jugular foramina
Descend neck posterolateral to common carotid artery
Left vagus crosses anterior to aortic arch then posterior to left lung root
Right vagus passes posterior to right lung root
Both vagi form a plexus round the oesophagus

9

What does recurrantLarangeal supply

Recurrent laryngeal branch of vagus nerve is not parasympathetic – runs back up neck to supply most skeletal muscles of larynx

10

Divisions of mediastinum

Superior: above sternal angle
Inferior: below sternal angle
Anterior: anterior to heart in pericardial sac
Middle: pericardial sac & heart
Posterior: posterior to pericardial sac and diaphragm

11

Phrenic nerves give sensory innervation to the

central tendon of the diaphragm
–mediastinal pleura
–pericardium
–peritoneum of central diaphragm

12

Where do l phrenic and vagus nerves run

Cross arch of aorta
Left phrenic descends in front of root lung
Left vagus crosses behind root lung gives off left recurrent laryngeal nerve – recurs (=turns back) around ligamentum arteriosum and aortic arch
Breaks up into many branches round oesophagus

13

Where does right vagus nerve run

Lies on the trachea

•Crosses behind the root lung

•Recurrent laryngeal branch – recurs (turns back) around right subclavian artery