Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Surface Anatomy of Lungs PowerPoint PPT presentation
SURFACE ANATOMY
OF LUNGS
SURFACE ANATOMY OF THORAX
Mark the following points
1.Rightsternoclavicular joint 2.Midpoint of sternal
angle 3.Midpoint of xiphistrnal joint
This forms anterior margin of right pleural
sac(costo mediastinal reflecton)
#An arched line convex upwards lying above
medial one third of clavicle ,the summit 2.5cm
above clavicle marks the dome of pleura
RIGHT PLEURAL MARKINGS
#A Curved line drawn around anterior , lateral`and
posterior aspect of thorax , convex downwards
passing through 8th rib in mid clavicular line,10th
rib in mid axillary line and a point 2cms right of
midline at T12 level ark the inferior margin of
pleural sac
# A line drawn on back 2 cms from midline between
C7 and T12 vertebrae marks the posterior margin
RIGHT PLEURAL MARKINGS
LUNGS , PLEURA AND
FISSURES(ANTERIOR VIEW)
Dome of pleura , posterior and inferior margin are
represented by the same lines as those on the right side.
ANTERIOR MARGIN
#MARK 1.Lt sternoc-lavicular joint
2.Midpoint of sternal angle
3.Mid sternum at the level of 4th costal cartilage
From mid sternum draw a line downwards and laterally to
reach lateral margin of sternum and toward 6th costal
cartilage 3cms from midline.
LEFT PLEURAL MARKINGS
BORDERS
RIGHT
OF LUNGS
#Apex of lungs ?cervical pleura
#Anterior border of Rt lung-
costomediastinal reflection of
pleura
#Inferior border-curved line lying
above the costo diaphragmatic
reflection of pleura(6th rib in
midclavicular line, 8th rib in
midaxillary line.
#Posterior-T10 spine(2cms
lateral to midline)
LEFT
#Upper part of anterior border upto 4 th costal cartilage
follows the pleura
#Below , due to the deep cardiac notch the border passes
from midline sharply to the left and downwards so that
at the level of 5th costal cartilage , it is about 3.5cm lateral
to sternal margin and then curves downwards and
medially to reach 6 th costal cartilage at about 4 cms
from medial plane.
#Inferior border and posterior border same as that of right
lung
POSTERIOR ASPECT OF TRUNK
RIGHT LATERAL ASPECT OF TRUNK
OBLIQUE FISSURE
#During the life fissure begins
posteriorly on the posterior
border of lung 2cms from
midline at the level of T5
#It passes anteroinferiorly in a
spiral course to meet the
inferior margin at 6th costo
chondral junction.
#After death due to the collapse
, and diaphragm elevation
upper end of oblique fissure-
T3 in a cadaver.
HORIZONTAL
FISSURE
#Right lung-Anterior
margin at the level of 4th
costal cartilage passing
backwards to meet
oblique fissure in mid
axillary line plane
#The multitude of small airways within the
lung parenchyma has a very large
combined surface area-over 300 cmsq in
the 3rd generation respiratory bronchioles.
#Gas transport occurs largley by diffusion
in the final segments.
BRONCHOPULMONARY
SEGMENTS
Each lobe is composed by two or more broncho-
pulmonary segments that are supplied by main
branches of each lobar bronchus
Bronchopulmonary segments are the well
defined anatomical ,functional and
surgical units of lung
Charecteristics features
Pyramidal in shape,apex directed towards
hilum,base towards surface of lungs
It is aerated by segmental bronchus
Each segment has its own
artery,segmental branch of pulmonary
artery
Each segmnt has its own lymphatic
drainage and autonomic supply
CLINICAL CORRELATION
Segmental resection of lungs-consevative
lung surgery
RIGHT
LEFT
#Upper Lobe
#Upper lobe
1.Anterior 2.Posterior
1.Anterior
3.Apical
2.Apical
#Middle lobe
3.Posterior
1.Lateral 2.Medial
4.Lingular
#Lower Lobe
1.Apical
#Lower lobe
2.Posterior basal
1.Apical
3.Lateral basal
2.Posterior basal
4.Anterior basal
3.Lateral basal
5.Medial basal
4.Anterior basal
BRONCHO PULMONARY SEGMENTS
This post was last modified on 12 August 2021