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MRCS part B > Anatomy of the thorax > Flashcards

Anatomy of the thorax Flashcards

1
Q

Blood flow to areas of the heart

A

LAD: left atrium, ventricle and IVS
Left circumflex: Left atrium and left ventricle
Left marginal: Left ventricle
RCA: Right atrium and ventricle
Right circumflex: Right ventricle and apex

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2
Q

What are the deep muscular relations of the breast

A

Pec major and serratus anterior
The lower medial edge just overlaps the upper part of the rectus sheath

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3
Q

How many lobules does the breast tissue have

A

15-20 lobules within the breast, each extends into the lactiferous duct and they all converge to the nipple
The lactiferous sinus acts as a reservoir and it lies beneath the areola

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4
Q

What are the coopers ligaments

A

Fibrous septa which extend from the subcutaneous tissue to the fascia of the chest wall (the pectoralis fascia)

These are responsible for the peau d’orange. invasion of the axillary lymphatics by tumour causes obstruction and subsequent oedema of the overlying skin. Parts of the skin that are tethered to the coopers ligaments appear as dimples. Hence, giving the appearance of an orange peel

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5
Q

What is the blood supply to the breast

A

Internal thoracic which is a branch of the subclavian
lateral thoracic which is a branch of the 2nd part of the axillary artery
Thoracoacromial artery which is a branch of the 2nd part of the axillary artery
Intercostal artery

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6
Q

What is the sensory innervation of the breast

A

4th to 6th intercostal nerves provides sensory and autonomic innervation

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7
Q

Where should a subclavian line catheter tip be

A

In the SVC and above the pericardial reflection

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8
Q

Describe the anatomy of the neurovascular bundle

A

Superior to inferior it is VAN in the intercostal groove

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9
Q

What is the superior limit of the pleura

A

The pleura projects 2.5cm above the middle third of the clavicle

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10
Q

What is the role of the thymus

A

important for the maturation of T cells and also releases hormones involved in T cell proliferation.
It atrophies after puberty

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11
Q

What ribs are considered atypical

A

1,2,10,11,12

The first is short and wide and has a single facet and the scalene tubercle
The second is thinner and longer and has a tuberosity on its upper surface for attachment with the serratus anterior
The 10th has only a single facet
11 and 12 also have single facets with no neck

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12
Q

What is the lymph drainage of the breast

A
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13
Q

What are the surface markings of the heart

A

Inf: 5th intercostal space midclavicular line on the left to the 6th costal cartilage on the right

Sup: 3rd costal cartilage on the right to the second intercostal space 2cm on the left of the sternum

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14
Q

What chambers of the heart form its boundaries

A
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15
Q

How many layers does the pericardium have

A

3 layers

Outer fibrous
Inner serous parietal and visceral layers

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16
Q

Where do the LCA and RCA arise from

A

From the aortic sinuses, there are 3
the LCA comes from the left and the left posterior AS
the RCA comes from the right coronary sinus

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17
Q

What is the venous drainage of the heart

A

Great, middle and small cardiac veins as well as the oblique and posterior veins. This forms 2/3rd of the venous drainage

The remaining 1/3rd is from venae cordis minimae and drain into each individual chamber.

The coronary sinus opens on the inferior border of the right atrium between the IVC and the tricuspid valve

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18
Q

What is the anatomically safe insertion site of the chest drain

A

Anterior: Posterior border of the pec major
Posterior: Midaxiallary line
Superior: Apex
Inferior: Line drawn above the 6th rib

Then put a needle in the 5th intercostal space above the 6th rib just anterior to the mid-axillary line.

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19
Q

What is the arterial blood supply of the chest wall

A

Posterior intercostals: 1 and 2 are supplied by the superior intercostal which is a branch of the costocervical trunk of the subclavian artery. Lower 9 are supplied by branches of the descending thoracic aorta

Anterior: Arises from the internal thoracic (1-6), superior and lateral and thoracic. Muscolophrenic artery supply 7-9.

Subcostal supplies spaces beneath the 12th rib

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20
Q

venous drainage of the thorax

A

Follows the arteries normally. Anterior is drained into the internal thoracic vein and the BCV and then the SVC. Posterior is azygous venous system.

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21
Q

Define thoracic outlet syndrome

A

Compression of the subclavian vessels or branches of the brachial plexus as they pass from the thorax into the arm

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22
Q

What are the clinical features of thoracic outlet syndrome

A

Nervous such as pain, parasthesia, muscle weakness

Arteries: Ischemia UL and emboli
Venous: Swelling UL

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23
Q

What are soem causes of thoracic outlet syndrome

A

cervical rib, fibrous band, malignancy, trauma

24
Q

What are the contents of the superior mediastinum

A

Muscles: Sterno thyroid and sternohyoid
Vessels: Aortic arch, BCV, LCC and LSC, BC and SVC
Nerves: Phrenic, vagus and left recurrent laryngeal
Viscera: Oesophagus and trachea
Others: Thoracic duct, thymus and lymph nodes

25
Q

What are the contents of the posterior mediastinum

A

Vessels: Thoracic part od descending aorta and azygous veins
Nerves: Vagus and splanchnic
Viscera: Oesophagus
Others: Lymph nodes and thoracic duct

26
Q

What are the contents of the middle mediastinum

A

Vessels: Ascending aorta, lower half of SVC, azygous vein and pulmonary artery and veins
Nerves: Phrenic
Viscera: heart and pericardium
Others: Bronchial lymph nodes

27
Q

SUbclavian steal syndrome

A

Patients have the steno-occlusive nature proximal to the origin of the vertebral artery, Hence the retrograde flow.
Can lead to ischemia of thee upper limbs and symptoms of dizziness, vertigo, syncope and other symptoms of potential vertebrobasilar insufficiency.

28
Q

What type of joint is the manubrium sternii

A

Secondary cartilagenous joint

29
Q

What important anatomical structures lie at the manubriosternal joint

A

SVC entering right atrium
Bif of trachea and pulmonary trunk
Arch of aorta

30
Q

What are the surface markings of the pleura

A

It starts at the midclavicular line, then runs along the sternal edge up to the 6th rib, then 8th rib midclav line, then 10th mid ax line and then 12th post ax line

31
Q

Surface marking of the horizontal fissure

A

4th intercostal space

32
Q

Surface marking of oblique fissure

A

Hands-on head, line drawn from T3 to the lateral sternal border 6th rib along the medial scapular border

33
Q

What are the signs of cardiac tamponade

A

Becks triad
Pulsus paradoxus: a fall of more than 10mmHG on insp
Kussmauls sign: Raised JVP on inspiration
progressive tachy and arrhythmia, widened mediastinum on CXR

34
Q

Name the anatomical landmark of performing a pericardiocentesis

A

The skin incision should be made just left of the xiphoid process, 1-2cm inferiorly, with needle at 45 degree angle and going towards the left scapula

35
Q

What are the most common coronary branches that occlude

A

LAD, RCS and circumflex

36
Q

How is the SA and AV node supplied

A

RCA in 60% of people and the LCA in 40%
AV is RCA
Right bundle branch is LCA
Left bundle branch is LCA nad RCA

37
Q

Describe the anatomy and the function of the pericardium

A

Thin and double-walled
It has visceral and parietal layers
The visceral is the epicardium and the parietal is attached to the fibrous pericardium
The space is for lubricating fluid
At the base, the fibrous pericardium attaches to the central tendon of the diaphragm
Overall, it helps to anchor the heart in the mediastinum and lubricate as well as prevents excess dilatation

38
Q

Azygous venous system

A
39
Q

What is the thoracic duct

A

It is the largest lymph channel of the body, it drains most of the body, apart from the right head and neck and arm and the right thorax.
It originates in the cisternal chylie in the abdomen opposite L2

40
Q

Hemi and accessory hemizygous venous system

A
41
Q

WHat structures drain lymph from the right side of the thorax

A

The right head, neck and thorax is drained by the right lymphatic duct, it joins either the right subclavian or IJV

42
Q

Management of a chylothorax

A

Drainage, aspiration
Medical treatment with octreotide to reduce the formation of chyle
TPN to reduce chyle formation. In 50% of patients the leak will self resolve

43
Q

What is the sympathetic trunk

A

Ganglionated chain of the ANS arising from the thoracolumbar vertebrae.

44
Q

What nerves lie on either side of the oesophagus

A

Rec lar

45
Q

What is the arterial and venous supply of the oesophagus

A

Art
Cervical part: Inf thy
Thoracic: Descending TA
abdominal: LGA and inferior phrenic

Venous: Inf thy and azygous, hemi and accessory and left gastric

46
Q

What is the innervation of the oesophagus

A

Cervical part: rec lar and sympathetic
Thoracic: oesphagial plexus and symp and greater splanch
Abdo: Lesser splanch, vagal

47
Q

What is the structure and anatomy of the diaphragm

A

The diaphragm is a double-domed musculotendinous sheet, located at the inferior-most aspect of the rib cage. It serves two main functions:

Separates the thoracic cavity from the abdominal cavity (the word diaphragm is derived from the Greek ‘diáphragma’, meaning partition).
Undergoes contraction and relaxation, altering the volume of the thoracic cavity and the lungs, producing inspiration and expiration.

It has three peripheral attachments:

Lumbar vertebrae and arcuate ligaments.
Costal cartilages of ribs 7-10 (attach directly to ribs 11-12).
Xiphoid process of the sternum.

The parts of the diaphragm that arise from the vertebrae are tendinous in structure, and are known as the right and left crura:

Right crus – Arises from L1-L3 and their intervertebral discs. Some fibres from the right crus surround the oesophageal opening, acting as a physiological sphincter to prevent reflux of gastric contents into the oesophagus.
Left crus – Arises from L1-L2 and their intervertebral discs.
The muscle fibres of the diaphragm combine to form a central tendon. This tendon ascends to fuse with the inferior surface of the fibrous pericardium. Either side of the pericardium, the diaphragm ascends to form left and right domes. At rest, the right dome lies slightly higher than the left – this is thought to be due to the presence of the liver.

48
Q

What is the arterial and venous supply of the diaphragm

A

The majority of the arterial supply to the diaphragm is delivered via the inferior phrenic arteries, which arise directly from the abdominal aorta. The remaining supply is from the superior phrenic, pericardiacophrenic, and musculophrenic arteries. The draining veins follow the aforementioned arteries.

49
Q

What is the Sibson fascia

A

Suprapleural extension of the endothoracic fascia, attaches to the inner border of the 1st rib and the transverse process of C7. Prevents further extension of the lungs and pleura into the neck

Subclav artery, vein and brachial plexus lie on it

50
Q

Stellate ganglion

A

Formed by fusion of C7 and T1 ganglion
It lies anterior to the transverse process of C7, superior to the neck of the 1st rib, just below the sub clavian artery.

51
Q

How many bronchopulmonary segments does each lung have

A

8 left and 10 right

52
Q

Describe the anatomy of bronchopulmonary segments

A

Pyramidal shape with apices facing the lung root and the base facing the pleural surface
Supplied by its own tertiary artery and veins.
It is separated from the surrounding lung by connective tissues
veins and lymphatics run along the edge of the segment

53
Q

Where does the trachea commence

A

At the level of C6

54
Q

Where does the lymph from the nipples, areola and glandular tissue of the breast drain into

A

Subareolar lymphatic plexus and from there it drains into the axillary and parasternal lymph nodes

55
Q

What is the innervation of the pec major and minor

A

Pec major is innervated by the medial and lateral pec nerves and pec minor is medial only

56
Q

What is poland syndrome

A

Congenital absence or underdevelopment of ipsilateral pec major and webbing of the ipsilateral hand

57
Q
A

MRCS part B (8 decks)

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