Trachea

TRACHEA

Q. 1

Which of the following statements is correct regarding the trachea:

 A

During deep inspiration, the tracheal bifurcation may descend to T6 level

 B

The left bronchus is wider and shorter

 C

The arch of the aorta lies over the right bronchus and is anterior to it

 D

The sensory supply of trachea is by the vagus

Q. 1

Which of the following statements is correct regarding the trachea:

 A

During deep inspiration, the tracheal bifurcation may descend to T6 level

 B

The left bronchus is wider and shorter

 C

The arch of the aorta lies over the right bronchus and is anterior to it

 D

The sensory supply of trachea is by the vagus

Ans. D

Explanation:

D. i.e. The Sensory supply of trachea is by vagus 

Parasympathetic supply to trachea is by vagus & recurrent laryngeal nerveQ.


Q. 2

Bifurcation of trachea is at the level of lower border of:  

 A

T1

 B

T2

 C

T3

 D

T4

Q. 2

Bifurcation of trachea is at the level of lower border of:  

 A

T1

 B

T2

 C

T3

 D

T4

Ans. D

Explanation:

Ans. D i.e. T4


Q. 3

Bifurcation of trachea is at which level:

 A

Opposite the disc between the T3-T4 vertebrae

 B

Opposite the disc between the T5-T6 vertebrae

 C

Opposite the disc between the T4-T5 vertebrae

 D

Opposite the disc between the T7-T8 vertebrae

Q. 3

Bifurcation of trachea is at which level:

 A

Opposite the disc between the T3-T4 vertebrae

 B

Opposite the disc between the T5-T6 vertebrae

 C

Opposite the disc between the T4-T5 vertebrae

 D

Opposite the disc between the T7-T8 vertebrae

Ans. C

Explanation:

The trachea begins in the neck as a continuation of the larynx at the lower border of the cricoid cartilage at the level of the sixth cervical vertebra.

  • In the cadaver, trachea ends below at the carina by dividing into right and left principal (main) bronchi at the level of the sternal angle (opposite the disc between the fourth and fifth thoracic vertebrae).
  • In living subjects, in the erect posture, the bifurcation lies at the lower border of the sixth thoracic vertebra.
  • In adults the trachea is about 10-15 cm long and 2 cm in diameter.
  • The fibroelastic tube is kept patent by the presence of U-shaped bars (rings) of hyaline cartilage embedded in its wall.
  • The posterior free ends of the cartilage are connected by smooth muscle, the trachealis muscle.

Q. 4

Shape of tracheal cartilage:       

 A

W shaped

 B

O shaped

 C

C shaped

 D

D shaped

Q. 4

Shape of tracheal cartilage:       

 A

W shaped

 B

O shaped

 C

C shaped

 D

D shaped

Ans. C

Explanation:

Trachea is kept patent by the presence of U-shaped bars (rings) of hyaline cartilage embedded in its wall. The posterior free ends of the cartilage are connected by smooth muscle, the trachealis muscle.


Q. 5

Angle of tracheal bifurcation is increased in enlargement of:

 A

Right ventricle

 B

Left ventricle

 C

Right atrium

 D

Left atrium

Q. 5

Angle of tracheal bifurcation is increased in enlargement of:

 A

Right ventricle

 B

Left ventricle

 C

Right atrium

 D

Left atrium

Ans. D

Explanation:

Ans. Left atrium


Q. 6

Cartilage in trachea ‑

 A

Hyaline

 B

Elastic

 C

Articular

 D

Fibro

Q. 6

Cartilage in trachea ‑

 A

Hyaline

 B

Elastic

 C

Articular

 D

Fibro

Ans. A

Explanation:

Ans. is ‘a’ i.e., Hyaline


Q. 7

Foreign body from trachea most common goes to right bronchus due to ‑

 A

Right bronchus shallow

 B

Wider & in continuous line with trachea

 C

Right bronchus is longer

 D

Right bronchus is horizontal

Q. 7

Foreign body from trachea most common goes to right bronchus due to ‑

 A

Right bronchus shallow

 B

Wider & in continuous line with trachea

 C

Right bronchus is longer

 D

Right bronchus is horizontal

Ans. B

Explanation:

Trachea bifurcates at Carina (at lower border of T4 vertebra at T4-T5 disc space) into right and left principal (primary) bronchi.

Right principal bronchus is wider, shorter (2.5 cm long), and more vertical in the line of trachea (25° with median plane).

Therefore a foreign body is most likely to lodge in the right bronchus.


Q. 8

Level of trachea bifurcation in pediatic patient is ‑

 A

T2

 B

T3

 C

Tq

 D

T5

Q. 8

Level of trachea bifurcation in pediatic patient is ‑

 A

T2

 B

T3

 C

Tq

 D

T5

Ans. B

Explanation:

Ans. is ‘b’ i.e., T3

  • Bifurcation of trachea in children is at T3 level while in adult at T4 – Ts level. In adult if may reach upto T6 level during deep inspiration.
  • Trachea extend from lower border of cricoid cartilage (level of C6) to upper border of T5 vertebra (adult).
  • Tracheal diameter in mm corresponds to age in year (pediatric) eg. 4mm in 4 year old child.
  • Narrower airway exert greater resistance in children so develop distress in respiratory tract infection.


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