Human Anatomy Vol 1

SUPERIOB VENA CAVA, AORTAAND PULMONARYTRUNK

A teenage girl was complaining of breathlessness.

The physician heard a'machine like murmur' during

auscultation on the second left intercostal space, close

to the margin of stemum. There was continuous thrill

on the same site. On getting radiographs of chest and

angiocardiography, a diagnosis of patent ductus

arteriosus was made.

o What is the 'machine-1ike'murmur?

o How can the shuntin6; of blood be prevented

. Describe briefly the function of ductus arteriosus
during prenatal life. When does it close?

Ans: e ductus arteriosns is a patent channel during

fetal life for conducting the blclod from left

pulmonary artery to arch r:f anrta beyo the origin

of left subclavian artery. c ductus camies blood

from right ventricle to descending theiracic aorta.

is is necessarv as lungs are not functioning. After

birth, with the functioning of lungs, ductus artedosus

obliterates and beco s ligamentum arteriosus. If

this does not take piace (as it occurs in one out of

(^3000) births), there is back fl of bloocl from aorta
into pulmonary artery giving rise to 'machine-like'
murrnur. The treatment is surgical.
MULIIPLE CHOICE QUESTIONS

1. 
   


2. 
   

   Branches of arch of aorta are all except:
   a. Brachiocephalic trunk
   b. Left common carotid
   c. Left subclavian
   d. Vertebral
   Posterior intercostal arteries of descending thoracic
   aorta are:
   a. Nine pairs
   c. Ten pairs

   
   


3. 
   

   Aortic aneurysm may cause following symptoms:
   a. Dyspnoea
   c. Dysphonia

   
   

b. Dysphagia

d. All of the above

b. Eleven pairs

d. Twelve pairs

4. Posterior relations of ascending aorta are all except:
   a. Transverse sinus of pericardium
   b. Right atrium
   c. Right pulmonary artery
   d. Right bronchus

ANS R$

1,. d 2.a 3.d 4.b

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