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Flashcards in Nose anatomy Deck (10)
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1
Q

Paranasal sinus

- List the types

A
  • Frontal
  • Ethmoidal
  • Sphenoid
  • Maxillary
2
Q

All paranasal sinuses are lined by…

A

Respiratory epithelium

- Mucous and ciliated epithelium

3
Q

Frontal sinus

  • Locatation and structure
  • Drainage
A

Inferior forehead, inside frontal bone
- Paired traingular sinuses

Drains into middle meatus of the lateral nose wall via the frontonasal duct.

4
Q

Blood supply and innervation of the frontal sinus

A

Blood supply
- Anterior ethmoidal arteries (from opthalmic, of ICA)

Innervation
- Supra-orbital branch of the opthalmic nerve (CNV1)

5
Q

Ethmoidal cells

  • Struture
  • Drainage
A

Composed of a pair of three cells
- Anterior, middle and posterior

Anterior
- Opens into ethmoidal infundibulum/ frontonasal duct

Middle
- Opens into ethmoidal bulla

Posterior
- Lateral wall, superior nasal meatus.

6
Q

Blood supply and innervation of the ethmoidal cells

A

Blood supply from the anterior and posterior ethmoidal arteries (opthlamic branches, from ICA)

Innervation

  • Anterior and posterior ethmoidal branches of the nasociliary nerve (opthalmic nerve, CNV1)
  • Orbital branches from the pteryhopalantine ganglion of the maxillary nerve (CNV2)
7
Q

Maxillary sinuses

  • Structure
  • Drainage/ opening
A

Largest, paired sinuses, located in the maxillae.

Pyramidal shape
- Base formed of maxillae, inferior concha and palantine bone, next to lateral nose

Opens in the centre of the semilunar haitus, which grooves the middle nasal meatus.

8
Q

Maxillary sinuses

  • Blood supply
  • Innervation
A

Blood supply from the infra-orbital and superior alveolar branches of the maxillary arteries.

Innervated by the infra-orbital and alveolar branches of the maxillary nerve (CNV2)

9
Q

Sphenoid sinus

  • Structure/ location
  • Opening
A

Two cavities located within the sphenoid bone

  • Posterior and superior to the nasal cavity
  • Inferior to the cranial cavity, pituitary gland and optic chiasm
  • Medial to cavernous sinuses

Opens into the roof of the nasal cavity via an aperture in the spehno-ethmoidal recess

10
Q

Blood supply and innervation of the sphenoidal sinuses

A

Blood is supplied by the pharyngeal arteries from the maxillary arteries.

Innervation:

  • Posterior ethmoidal branch of the ophthalmic nerve (CNV1)
  • Orbital branches of the pterygopalantine ganglion of CNV2 (maxillary)