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anatomy: thoracic cavity > mediastinum > Flashcards

mediastinum Flashcards

1
Q

Mediastinum is the _____ of thoracic cavity

A

Middle

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2
Q

Mediastinum boundaries

A

Thoracic inlet above

Diaphragm below

Sternum anteriorly

T vertebrae posteriorly

Lungs laterally

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3
Q

Mediastinum is subdivided into ___ mediastinum and ___mediastinum

A

Sup

Inf

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4
Q

Inferior mediastinum subdivided into three portions

A

Ant

Middle

Post

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5
Q

Sup Mediastinum is directly behind…

A

Manubrium

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6
Q

Structures in the superior mediastinum

A

Thymus gland (T lymphocytes)

Great vessels: brachiocephalic vein, arch of the aorta call mom pulmonary trunk

Trachea (primary bronchi bifurcation)

N: vagus and phrenic

Esophagus

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7
Q

Vagus n carries

A

Sensory afferents from the heart/lung/gut and parasympathetic efferents to the larynx and heart/lung/gut

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8
Q

L recurrent laryngeal n hooks around ____, R recurrent laryngeal n hooks around ____

A

Aorta

R subclavian artery

(Innervate internal larynx musc: speech & swallowing)

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9
Q

Ant mediastinum betw

A

Body of sternum and pericardium

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10
Q

Middle mediastinum is where ___ sits

A

Heart

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11
Q

What’s sack surrounds the heart allowing it to beat freely without friction and is attached to the diaphragm and great vessels?

A

Pericardium

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12
Q

Fibrous pericardium is a tough fibrous outer layer covering the heart and is attached to the ____

A

Diaphragm

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13
Q

Serous pericardium is composed of two inner layers

A

Parietal and visceral pericardium (epicardium)

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14
Q

Pericardial layers from superficial to deep

A

Fibrous pericardium

Parietal pericardium

Pericardial cavity

Visceral pericardium

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15
Q

Heart is mostly the ___ pointing toward left hip in about the fifth intercostal space

A

LV

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16
Q

Base of the heart is the ___ that are positioned behind the ventricles

A

Atria

17
Q

Grooves on heart surface that split heart into chambers

A

Sulci

18
Q

Sulci:

A

Coronary (atrioventricular sulcus): sep atria fr ventr

Ant interventricular sulcus: sep RV & LV ant

Post interventricular sulcus: sep RV & LV post

19
Q

Heart vasculature

A

RCA (coronary artery)

LCA

20
Q

RCA gives odd

A

R marginal artery which descends inf to feed RV

21
Q

Venous drainage for R marginal artery

A

Sm cardiac vein (empty into coronary sinus—> RA)

22
Q

RCA becomes

A

Post interventricular artery (post descending) vascularize post heart

23
Q

Venous drainage for post interventricular artery

A

Middle cardiac vein

24
Q

RCA usually vascularized

A

All RV, 30% LV

60% SA node, 80% AV node

25
Q

LCA splits into

A

Ant interventricular artery (ant descending)

Circumflex artery

26
Q

Ant interventricular artery (ant descending)feeds…

Venous drainage?

A

LV & interventricular septum

Gr cardiac vein

27
Q

Circumflex artery gives off

A

L marginal artery

Post L ventricular artery

Coronary sinus

28
Q

LCA feeds

A

70% LV, 40% SA, 20% AV node

29
Q

___ sealed opening fr fetal bypass called the foramen ovale

A

Fossa ovalis

30
Q

Pectinate musc

A

Muscular ridges anterior wall of the RA

31
Q

Sinoatrial node (pacemaker) inf and lat to ___ opening

A

Sup vena cava

32
Q

Atrioventricular node electrical conduction

A

Bundle of His

R&L bundle branches

Purkinje fibers

RV&LV

33
Q

R valve

A

Tricuspid (R atrioventricular valve)

34
Q

Tricuspid valve is attached to ___ to the papillary muscles

A

Cordae tendonae

35
Q

___ is the smooth outlet track from the RV into the pulmonary trunk via pulmonary valve R semilunar valve

A

Infindibulum (conus arteriosus)

36
Q

Semilunar valves (pulmonary valve) have 3 cusps with no ___ attached

A

Cordae tendonae or papillary musc

37
Q

L valve

A

Bicuspid (L atrioventricular, mitral valve)

38
Q

Nordic sinuses are the areas behind the aortic valve cusps we’re blood flows into the R and L coronary arteries during

A

Diastole

anatomy: thoracic cavity (2 decks)

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