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Neuro 1 Exam > Nasal Cavity and Pterygopalatine Fossa > Flashcards

Nasal Cavity and Pterygopalatine Fossa Flashcards

1
Q

Bony part of nose is made up of what?

A
  • Nasal bones
  • Frontal process of maxilla
  • Nasal part of frontal bone and nasal spine •
  • Bony part of nasal septum
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2
Q

• Cartilagenous part of nose:

A
  1. 2 lateral nasal cartilages
  2. 2 alar cartilages (major alar cartilage and minor alar cartilage)
  3. Septal cartilage (nasal septum)
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3
Q

What makes up the septum proper?

A
  1. Perpendicular plate of the ethmoid bone
  2. Septal cartilage
  3. Vomer bone
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4
Q

When we take the septum away what. do we see

name them

A

concha.

Superior nasal concha and middle nasal concha (part of the ethmoid bone)

inferior nasal concha

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5
Q

Except for the v_________________, all of the nasal are lined with nasal mucosa.

A

vestibule of the nose (considered an external portion)

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6
Q

Nasal mucosa is firmly connected to the what?

A
  • periostium of the bony parts of the nasal cavity
  • perichondrium of the cartilagenous nasal components.
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7
Q

The areas lined with nasal mucosa constitute the what?

A
  1. respiratory area (inferior 2/3)
  2. olfactory area (superior 1/3).
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8
Q

What. are concha called when they are lined with mucosa

A

turbinates

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9
Q

The olfactory area has specialized nasal mucosa the contains the _______________ for special sense olfaction (smell).

A

peripheral nerve endings from the olfactory nerve (CN I)

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10
Q

boundaries of nasal cavity

A
  • Roof: frontal bone, ethmoid bone, sphenoid bone
  • Floor = palatine process of maxilla, horizontal plate of palatine bone
  • Medial Wall = nasal septum (perpendicular plate of ethmoid, vomer, septal cartilage, nasal crests of maxillary & palatine bones)
  • Lateral Wall = superior, middle, and inferior nasal conchae
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11
Q

What do the nasal conchae do?

A

Divide nasal cavity into 4 passages

  • spheno-ethmoidal recess (has opening of sphenoid sinus)
  • superior nasal meatus (has 2 openings of ethmoidal sinuses)
  • middle nasal meatus (opening of frontal sinus)
    • maxillary sinus also opens into middle nasal meatus in posteriorart of semilunar hiatus at the maxillary ostium (below ethmoid bulla).
  • inferior nasal meatus (opening of nasolacrimal duct)
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12
Q

what. are. our 4 nasal passages

A
  1. Sphenoethmoid recess
  2. Superior meatus
  3. middle meatus
  4. inferior meatus
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13
Q
  1. Sphenoethmoid recess
  2. Superior meatus
  3. middle meatus
  4. inferior meatus

what sinuses are in these nasal passages?

A
  1. Sphenoethmoid recess: sphenoid sinus
  2. Superior meatus: posterior ethmoid sinus
  3. middle meatus: anteiror and middle ethmoid sinus, frontal sinus, maxillary. sinus
  4. inferior meatus: nasolacrimal duct
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14
Q

What is the arterial supply. to the nasal cavity?

A

MAXILLARY A (most of the blood) and FACIAL A

Most of the blood is supplied to the lateral and medial walls of the nasal cavity from branches of the maxillary artery:

  • sphenopalatine a.
  • anterior & posterior ethmoidal aa.
  • greater palatine a.

But also from the facial artery:

  • superior labial a.
  • lateral nasal branches
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15
Q

What veins drain the nasal cavity?

A

* Venous drainage to

  1. sphenopalatine vein,
  2. facial vein
  3. ophthalmic veins
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16
Q

What. is Kiesselbach area ?

A

Kiesselbach area is where all five arteries come together in a capillary bed that can bleed profusely.

ya dont want to be pernched hurr

17
Q

Describe the sinus:

Maxillary sinus

Innervation:

Drainage:

A

LARGEST

Innervation: Superior alveolar N branches

Drainage: drains via the maxillary ostium -> middle meatus

18
Q

Describe the sinus:

Ethmoid

Innervation:

Drainage:

A

Innervation: nasociliary N (CN V1)

Drainage:

  • anterior & middle ethmoidal cells drain into _middle meatu_s •
  • posterior ethmoidal cells drain into superior meatus
19
Q

Sphenoid sinuses

I:

Drainage

A

I:posterior ethmoidal N

Drainage: drains via the spheno-ethmoidal reecess

20
Q

Frontal sinus

I:

Drains:

A

I: Supraobitial nerves (CN V1)

  1. Drains via the frontonasal duct into the semilunar hiatus of middle meatus
21
Q

what is the Pterygopalatine Fossa

A

A small pyramid-shaped space that is found inferior to the apex of the orbit

22
Q

Borders of the pterygopalatine fossa

A
  • Anterior = maxillary tuberosity
  • Posterior = pterygoid process of sphenoid (lateral plate)
  • Medial = perpendicular plate of palatine bone
  • Lateral = opens into infratemporal fossa via pterygomaxillary fissure Roof = (incomplete) greater wing of sphenoid
  • Floor = pyramidal process of palatine bone
23
Q

Openings of the Pterygopalatine Fossa

A
  • Superior = opens into inferior orbital fissure
  • Inferior = closed except for palatine foramen
24
Q

What nerve is mainly in the ptergopalatine fossa that we are looking at?

A

V2

we can see

zygomatic n.

posterior superior alveolar n.

greater palatine n.

lesser palatine n.

Nasopalatine n.

25
Q

Contents of the pterygopalatine fossa

A

Contents:

  1. • Maxillary nerve (CN V2)
  2. • Pterygopalatine ganglion
  3. • Third part of Maxillary artery
26
Q

what does the maxillary. N do within the pterygopalatine fossa

A

Maxillary N (V3) -> ptergopalatine nerves and zygomatic N -> [zygomaticofacial n and zygomaticotemporal N

zygomaticotemporal N -> has a communicating branch that conveys parasympathetic fibers to lacrimal N (CN V1)

27
Q

Parasympathetic fibers to pterygopalatine ganglion
are from _____________. finish

A

facial nerve (CN VII) via the greater petrosal nerve

  1. The greater petrosal n. joins thedeep petrosal n. to form thenerve of the pterygoid canal
  2. The parasympathetic fibers from the greater petrosal n. supply the pterygopalatine ganglion
    3.
28
Q

Sympathetics in the ptergo

A
  • The deep petrosal nerve arises from the internal carotid plexus and conveys postsynaptic sympathetic fibers which join branches of the maxillary n. via the pterygopalatine ganglion (but do not synapse there).
  • Presynaptic parasympathetic fibers are from the superior cervical ganglion
29
Q

Whatnerves will we see in the ptergopalatine fossa

A
  1. infraorbitalN/
  2. Orbital branches of V2
  3. Greater palatine
  4. Lesser palatine
30
Q

LOOK MAINLY. FOR NERVES IN THE FOSSA. A are TOO SMALL

A

Neuro 1 Exam (24 decks)

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