Middle Meatus Of The Nose: Anatomy, Openings, And Clinical Significance

Middle Meatus Of The Nose: Anatomy, Openings, And Clinical Significance

Question 1. Middle meatus of nose
Answer:

• Lies beneath middle concha
• It presents
  1. Ethamoidal bulla
     • It is rounded elevation produced by middle ethamoidal sinus
  2. Hiatus semilunaris
     • It is deep semicircular sulcus below bulla
  3. Infundibulum
     • It is short passage at anterior end of hiatus

Middle meatus of nose Openings:

Question 2. Ethmoidal air sinuses
Answer:

• Ethmoidal sinuses are numerous small inter communicating spaces within the labyrinth of the ethmoid bone
• Bounded above by orbital plate of frontal bone, behind by sphenoidal conchae and the orbital process of the palatine bone and anterior by the lacrimal bone
• Sinuses are divided into anterior, middle and posterior groups

Question 3. Frontal sinus.
Answer:

• It lies in the frontal bone deep to the superciliary arch
• It is rudimentary at birth & develops at the age of 7-8 years

Frontal sinus Extend:

• Superiorly- Medial end of the eyebrow
• Posteriorly- Medial part of the roof of the orbit