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
|
