Question
Constriction of esophagus are at all sites EXCEPT:
| A. | Arch of aorta |
| B. |
Left main bronchus |
| C. | Left atrium |
| D. |
Diaphragm |
Show Answer
|
Correct Answer » C Explanation |
 |
Left atrium
CONSTRICTIONS OF ESOPHAGUS
- Esophagus shows 4 constrictions-
- At its beginning at C6 vertebra:- 15 cm (6 inches) from incisor.
- At the level of T4 vertebra where it is crossed by the arch of the aorta:- 22.5 cm (9 inches) from incisor.
- At the level of T6 vertebra where it is crossed by left principal bronchus:- 27.5 cm (11 inches) from incisor.
- At the level of T10 vertebra, its passage through esophageal hiatus of diaphragm (lower esophageal sphincter):- 37.5-40 cm (15-16 inches) from incisor.
- The narrowest part of the esophagus is its commencement at the cricopharyngeal sphincter.
|
SITE |
VERTEBRAL LEVEL |
DISTANCE FROM CENTRAL INCISOR |
|
CRICOPHARYNX |
C6 |
15 |
|
AORTIC ARCH |
T4 |
25 |
|
LEFT MAIN BRONCHUS |
T6 |
28 |
|
ESOPHAGEAL HIATUS |
T10 |
40 |