Nasal Cavity And Paranasal Sinus Flashcards
Nasal septum divides?
Nostrils
Another septum divides what 2 things?
External nose and nasal cavity
What is the ala nosi?
Rounded, mobile lateral margin
External nose is made of what parts of what 3 bones?
Nasal bones, nasal part of frontal bone, and frontal processes of maxilla
Below, the framework is formed by ?
Plates of hyaline cartilage
- Skin of external nose is supplies by branches of what 2 arteries (be specific)?
- Skin of the ala/lower part of septum are supplied by branches of what artery?
- Infratrochlear and external nasal branches of ophthalmic nerve and infraorbital branch of maxillary nerve
- Branches from facial artery
Floor of the nasal cavity is formed by what 2 things?
Palatine process of maxilla and horizontal plate of palatine bone
Roof of nasal cavity:
- Formed anteriorly by?
- Formed medially by? Located beneath?
- Formed posteriorly by?
- Nasal and frontal bones
- Cribiform plate of ethmoid; located beneath anterior cranial fossa
- Sphenoid
Medial wall of nasal cavity:
- AKA
- Made of what 2 substances?
- Consists of what 2 bones?
- Divides what 2 things?
- Nasal septum
- Bone and cartilage
- Ethmoid and vomer
- Right and left nasal cavity
Lateral walls of nasal cavity is marked by what 3 things?
Concha vs meatus?
Superior, middle, and inferior concha; meatus is the space below each concha
What are the openings to the following parts of the lateral walls of nasal cavity:
- Inferior meatus
- Middle meatus (3)
- Superior meatus
- Sphenoethmoidal recess
- Nasolacrimal duct
- Maxillary, frontal, and anterior ethmoid sinuses
- Posterior ethmoid sinuses
- Sphenoid sinus
- Maxillary, anterior and middle ethmoidal air cells and frontal sinuses open into
- Sphenoid sinus opens into?
- Posterior ethmoidal air cells open into?
- Nasolacrimal canal drains into
- Middle meatus
- Sphenoethmoidal recess
- Superior meatus
- Inferior meatus
- Most important branch of the maxillary artery for the nasal cavity?
- What does this artery anastomose with? Where?
- __ venous plexus is drained by veins that accompany the arteries
- Sphenopalatine artery
- Septal branch of superior labial branch of the facial artery; in the region of the vestibule
- Submucous venous plexus
What 2 nerves supply ordinary sensation to the nasal cavity?
What nerves supply special visceral afferent?
Branches of V1 and V2
Olfactory nerves (CN I)
- Lymph vessels draining the vestibule end in what nodes?
2. Remainder of nasal cavity is drained by vessels that pass to what nodes?
- Submandibular nodes
2. Upper deep cervical nodes
Paranasal sinuses:
- Found in the interior of what 4 bones
- Lined with? Filled with?
- Communicate with __
- Maxilla, frontal, sphenoid, and ethmoid
- Mucoperiosteum; filled with air
- Nasal cavity
How is the mucus produced moved into the nose?
How is drainage of mucus achieved?
By ciliary action of columnar cells
Siphon action created during blowing your nose
4 functions of the paranasal sinuses?
Resonators of the voice, reduce skulls weight, help warm/moisten inhaled air, act as shock absorbers in trauma
Maxillary sinus:
- Shape
- Location
- Roof is formed by
- Floor is related to
- Opens into?
- Pyramidal; paired and symmetric
- Behind the skin of the cheek
- Floor of the orbit
- Roots of 2nd premolars and 1st molar teeth
- Middle meatus of the nose
Frontal sinuses:
- Location
- How are they separated from each other?
- Shape?
- Extends upward above?
- Opens into?
- Within the frontal bone
- By a bony septum
- Triangular; rarely symmetrical
- Above medial end of the eyebrow and backward into medial part of roof of orbit
- Opens into the middle meatus
Sphenoidal sinus:
- Location
- Extends from where to where
- Opens into?
- Within the body of the sphenoid
- Between dorsum sellae and post clinoid process (below sella turcica)
- Sphenoethmoidal recess above the superior concha
Ethmoid sinuses (anterior, middle, and posterior):
- Location
- Anterior and middle drain into?
- Posterior drains into?
- Why are they separated from the orbit?
- Within ethmoid bone; between nose and orbit
- Middle nasal meatus
- Superior nasal meatus
- So infection cannot readily spread from the sinuses to orbit
What will happen if the paranasal sinuses apertures are blocked or filled with fluid?
Your voice will change
