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CVR anatomy > Lungs, Pleura And Diaphragm > Flashcards

Lungs, Pleura And Diaphragm Flashcards

1
Q

Pleurae

A

2 layers of membrane (the pleurae) cover the lungs and structures passing into and out of the lungs- pulmonary vessels and main bronchi

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2
Q

2 layers of pleura

A

Parietal pleura lines inside of thorax
• Visceral pleura covers surface of lungs and extends into the fissures
• Very thin pleural cavity lies between 2 layers
• layers are continuous with each other

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3
Q

Parts of parietal pleura

A

-cervical pleura covers apex of lung
-costal pleura lies adjacent to the ribs
-mediastinal pleura lies adjacent to heart
-diaphragmatic pleura lies adjacent to diaphragm

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4
Q

Costodiaphragmatic recess

A

gutter around the periphery of the diaphragm, where the costal pleura becomes continuous with the diaphragmatic pleura

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5
Q

Mediastinum

A

divides thoracic cavity in 2 (extends from vertebral bodies behind to sternum)- heart, great blood vessels, oesophagus and trachea contained within thickness

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6
Q

Which nerves innervate the parietal pleura

A

innervated by intercostal nerves that innervate the overlying skin of the chest wall- somatic sensory fibres carry sensation to consciousness so injury is very painful

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7
Q

Which nerves innervate the visceral pleura

A

innervated by autonomic sensory nerves (visceral afferents)

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8
Q

Lobes of lungs

A

right lung has 3 lobes (superior, middle + inferior), left lung has 2 lobes (superior + inferior) to accommodate space of heart- lingula

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9
Q

Fissures

A

lobes separated by fissures- both lungs have an oblique fissure and right lung has a horizontal fissure

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10
Q

Surface and borders of lungs

A

• Costal surface - adjacent to the ribs.
• Mediastinal surface - adjacent to the heart, marked by the hilum
• Diaphragmatic surface - the inferior surface of the lung.
• Anterior border - sharp and tapered.
• Posterior border – thick and rounded.
• Inferior border - sharp and tapered.

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11
Q

Alveoli

A

Site of gas exchange
Around 300 million per lung

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12
Q

Each lung served by…

A

one pulmonary artery, 2 pulmonary veins, one main bronchus

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13
Q

Hilum

A

the region on the mediastinal surface of the lung where the pulmonary artery, pulmonary veins and main bronchus enter and exit the lung
• At the hilum of the right lung, the pulmonary artery lies anterior to the main bronchus.
• At the hilum of the left lung, the pulmonary artery lies superior to the main bronchus.
• At both the right and left hila, the two pulmonary veins are usually the most anterior and inferior vessels.

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14
Q

Pleura enclosed root

A

root of each lung lies between the heart and the lung and comprises the pulmonary artery, pulmonary vein and main bronchus

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15
Q

Bronchial tree

A

Each main (primary) bronchus divides into lobar (secondary) bronchi; three in the right lung and two in the left lung (i.e. one lobar bronchus for each lobe).
• Each lobar bronchus divides to give rise to segmental (tertiary) bronchi.
Bronchi then divide in to bronchioles and then alveoli

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16
Q

How many segmental bronchi in each lung

A

Approx. 10 so 10 bronchopulmonary segments

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17
Q

Walls of trachea

A

walls of the trachea and bronchi contain smooth muscle and cartilage, but the walls of bronchioles only contain smooth muscle. Contraction and relaxation of the smooth muscle is under autonomic control.

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18
Q

Trachea

A

its upper end is continuous with the cricoid cartilage. The corrugated appearance of the trachea comes from the series of c-shaped cartilages that strengthen its wall and keep it open. In between them, the tracheal wall is soft, so that the trachea is highly flexible.

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19
Q

Right and left bronchus

A

Right main bronchus is shorter, wider and descends more vertically than left main bronchus- foreign body more likely to enter

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20
Q

Carina

A

trachea bifurcates (at level of T4)into left and right main bronchi at level of sternal angle- marked by a ridge of cartilage called the carina

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21
Q

Which arteries supply the lungs

A

bronchial arteries from descending aorta supply the lungs

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22
Q

Which veins supply the lungs

A

Bronchial veins return blood to the azygos system of veins

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23
Q

Which nerves innervate the lungs

A

Parasympathetic autonomic fibres stimulate construction of the bronchial smooth muscle (bronchoconstriction) and secretion of glands of bronchial tree
• Sympathetic autonomic fibres stimulate relaxation of bronchial smooth muscle (bronchodilation) and inhibit secretion from glands
• Visceral afferents relay sensory information from lungs and visceral pleura to CNS

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24
Q

Which ducts does lymph drain into in lung

A

Lymph from lungs drains into venous system via thoracic duct or right lymphatic duct

The lymphatic vessels of the lung arise from two lymphatic plexuses:

Superficial (subpleural) – drains the lung parenchyma.
Deep – drains the structures of the lung root.
Both these plexuses empty into the trachebronchial nodes – located around the bifurcation of the trachea and the main bronchi. From here, lymph passes into the right and left bronchomediastinal trunks.

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25
Diaphragm
Broad, thin, domed sheet of skeletal muscle • Separates thoracic and abdominal cavities • Superior surface adjacent to parietal pleura
26
Central tendon
Central part of diaphragm is fibrous- fuse with fibrous pericardium
27
Apertures
openings in diaphragm allow passage of structures between thorax and abdomen eg aorta
28
What is the diaphragm attached to
Attached to xiphoid process, costal margin (and to tips of 11th and 12th ribs) and lumbar vertebrae
29
Which nerves innervate the diaphragm
• Phrenic somatic nerves innervate diaphragm- formed in neck by fibres from C3,C4 and C5 spinal nerves (contain motor and sensory fibres)
30
Inspiration
• The diaphragm and external intercostal muscles contract, increasing the intrathoracic volume (the external intercostals pull the ribs superiorly and laterally, and the ribs pull the sternum superiorly and anteriorly, increasing the AP and lateral dimensions of the thoracic cavity). • The lungs expand (increase in volume) with the thoracic wall (due to surface tension). • The pressure in the lungs decreases below atmospheric pressure and air is drawn into the lungs. • Action of scalene muscles raises the first and second ribs and the manubrium in deep inspiration
31
Expiration
• The diaphragm and external intercostal muscles relax, and the internal intercostals contract, decreasing the intrathoracic volume (the internal intercostals pull the ribs inferiorly, and the ribs pull the sternum inferiorly and posteriorly, decreasing the AP and lateral dimensions of the thoracic cavity). • The lungs recoil (decrease in volume). • The pressure in the lungs increases above atmospheric pressure and air is expelled from the lungs. • Anterior abdominal wall muscles contribute to forced expiration eg coughing or sneezing
32
Difference between normal, vigorous and forced breathing
• In normal, quiet breathing- inspiration active and mainly driven by diaphragm but expiration is passive • In vigorous breathing- active expiration uses internal intercostal muscles • in forced breathing eg exacerbation in asthma or COPD- accessory muscles of breathing (sternocleidomastoid, pectoralis major and minor, serratus anterior) contribute to movement of ribs and aid ventilation. Anterior abdominal wall muscles contribute to forced expiration
33
3 planes of movement of thoracic cavity during breathing
1. Vertically - due to the contraction and relaxation of the diaphragm. 2. Laterally - due to contraction of the intercostal muscles which move the ribs. 3. Antero-posteriorly (AP) – due to movement of the sternum secondary to movement of the ribs.
34
Role of pleura fluid in breathing
pleural fluid creates surface tension which keeps the lung and thoracic wall together, so when thoracic cavity changes volume, lung change volume with it • Surface tension between the two pleural membranes keeps them in contact with each other and prevents the lung from ‘collapsing’ away from the thoracic wall. • If the surface tension is ‘broken’ (e.g. by a penetrating injury of the chest that punctures the parietal pleura and introduces air into the pleural cavity - pneumothorax) then ventilation may become dysfunctional.
35
Crura
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.
36
Pathways through the diaphragm
Caval Hiatus (T8) Inferior vena cava Terminal branches of right phrenic nerve Oesophageal Hiatus (T10) Oesophagus Right and left vagus nerves Oesophageal branches of left gastric artery/vein Aortic Hiatus (T12) Aorta Thoracic duct Azygous vein
37
How many intercostal muscle pairs are there
11
38
Epithelium of bronchial tree
The trachea and bronchi are lined by ciliated pseudostratified columnar epithelium, interspersed by goblet cells, which produce mucus. The combination of sweeping movements by the cilia and mucus from the goblet cells forms the functional mucociliary escalator. This acts to trap inhaled particles and pathogens, moving them up out of the airways to be swallowed and destroyed.
39
Neurovascular supply of trachea
The trachea receives sensory innervation from the recurrent laryngeal nerve. Arterial supply comes from the tracheal branches of the inferior thyroid artery, while venous drainage is via the brachiocephalic, azygos and accessory hemiazygos veins.
40
Bronchioles- club cells
produce a surfactant lipoprotein which is instrumental in preventing the walls of the small airways sticking together during expiration.
41
Hierarchy of bronchioles
Conducting bronchioles- transport air but lack glands and are not involved in gas exchange Terminal bronchioles Respiratory bronchioles- distinguishable by the presence of alveoli extending from their lumens.
42
Trachea is a continuation of the…
Larynx
43
Nerves of thorax
•Left and right phrenic nerves (C3,4 and 5) – innervate the diaphragm •Left and right vagus nerves – complex •Vagus is a cranial nerve (leaves the brainstem) •Parasympathetic fibres – supply the thoracic viscera •Somatic motor fibres – supply muscles of the pharynx and larynx •Somatic sensory fibres – supply the larynx •Left and right sympathetic trunks / chains – complex •Sympathetic innervation to thoracic and abdominal viscera, smooth muscle of blood vessels and glands
44
Bronchoconstriction
Parasympathetic
45
Auscultation
Listen to lower lobe on back Middle lobe listen to anteriorly
46
What organ sits under right side of diaphragm
Liver
47
Sternocleidomastoid
- connected to neck and lifts sternum
48
Pectoralis major
connects humerus to sternum. Involved in internal rotation, Adduction and flexion of arm
49
Serratus anterior
involved in protraction. Only muscle supplied by long thoracic nerve
50
Between which two layers of tissue is the intercostal neurovascular bundle located?
internal and innermost intercostal muscle layers.
51
The internal thoracic artery branches from which larger artery?
Subclavian
52
Which nerve(s) supplies the parietal pleura of the lateral chest wall
Intercostal nerves
53
The inferior border of the lung is located at the level of which rib posteriorly?
10th
54
The inferior border of the lungs anteriorly is at the level of the
6th rib
55
The inferior border of the lungs laterally is at the level of the
8th rib
56
The inferior border of the parietal pleura (which is two rib-levels lower than that of the lungs all the way around) is at the level of the
12th rib posteriorly
57
Which spinal nerves contribute to the phrenic nerve?
C3-C5
58
which muscles are used in deep inspiration to move clavicle and sternum
scalene muscles
59
Shape of cervical (3-7) vertebrae
Small Wide side to side Spinous process= Short, bifid, projects directly posteriorly Triangular vertebral foramen Transverse processes contain foramina
60
Movements allowed by cervical vertebra
Flexion Extension Lateral flexion Rotation
61
Superior and inferior articulating processes of cervical vertebra
Superior facets directed superoposteriorly Inferior facets directed inferoanteriorly
62
Shape of thoracic vertebrae
Larger than cervical Heart-shaped Bears 2 costal facets Spinous process - long, sharp , projects inferiorly Circular vertebral foramen Transverse process bear facets for ribs (except T11 and T12)
63
Movements allowed by thoracic vertebra
Rotation Lateral flexion (limited by ribs) Flexion and extension prevented
64
Superior and inferior articulating processes of thoracic vertebra
Superior facets directed posteriorly Inferior facets directed anteriorly
65
Shape of lumbar vertebra
Massive Kidney shaped Spinous process - short, blunt, projects directly posteriorly Triangular vertebral foramen Transverse processes - thin and tapered
66
Movements allowed by lumbar vertebra
Flexion Extension Some lateral flexion Rotation prevented
67
Superior and inferior articulating processes of lumbar vertebra
Superior facets directed posteromedially (or medially) Inferior facets directed anterolaterally (or laterally)
68
At what level does the trachea begin
C6
69
Structures found in lung hilum
Pulmonary veins Pulmonary arteries Main bronchi
70
Posteriorly, how far down the ribs does the inferior border of the lungs reach
10th rib
71
Anteriorly, how far down the ribs does the inferior border of the lungs reach
6th
72
Laterally, how far down the ribs does the inferior border of the lungs reach
8th
73
Posteriorly, how far down the ribs does the inferior border of the parietal pleura reach
12th
74
Anteriorly, how far down the ribs does the inferior border of the parietal pleura reach
8th
75
Laterally, how far down the ribs does the inferior border of the parietal pleura reach
10th

CVR anatomy (13 decks)

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