Paranasal Sinuses Flashcards
External nose
Bones and cartilage
- Root of nose 3 bones
- Frontal
- Maxilla
- Nasal
- Dorsum and apex of nose, 3 hyaline cartilages
- Septal
- Lateral nasal
- Alar
Nasal Cavity Boundaries
Floor and roof
- Floor
- Hard palate
- Palatine process of maxilla
- Horizontal plates of palatine bone
- Hard palate
- Roof
- Cribriform plate,
- sphenoid,
- frontal,
- nasal,
- lateral nasal cartilages
Nasal cavity boundaries
Lateral wall
medial wall
external nose
- Lateral wall
- Nasal
- Ethmoid
- Sphenoid
- Maxilla
- Palatine
- Inferior nasal conchae
- Medial wall
- Nasal septum
- External nose
- 2 nasal bones and nasal cartilages
Nasal Conchae
- Superior nasal conchae, middle nasal conchae
- Ethmoid bone
- Inferior nasal conchae
Nasal Meatuses
- Sphenoethmoidal recess
- Superior meatus
- Middle meatus
- Inferior meatus
Regions of Nasal Cavities
- Nasal vestibules
- Nares
- Respiratory regions
- Openings between nasal cavities and nasopharynx
- Olfactory regions
- CN I
Olfaction
- Olfactory neurons
- Chemoreceptors, Bipolar neurons
- Supporting cells
- Basal cells
- Stem cells for renewal of other cells
- Project to primary olfactory cortex
Innervation of Nasal cavities
3
- Olfaction
- Olfactory nerve CN I
- General sensation
- CN V1 and CN V2
- Anterior ethmoid of V1
- Nasopalatine, infraorbital, greater palatine of V2
- CN V1 and CN V2
- Parasympathetic
- CN VII
- Greater petrosal via pterygopalatine ganglion
- Sympathetic
- from T1 via superior cervical ganglion
Arterial supply to Nasal Cavities
- Terminal branches of Maxillary and facial (ECA)
- Sphenopalatine, Greater palatine
- Superior labial
- Lateral nasal
- Branches of opthalmic a (ICA)
- Dorsal nasal
- Ant and post ethmoidal
- ECA and ICA anastosome on nose
Venous drainage of nasal cavities
- Veins passing with Max arteries drain into pterygoid plexus in the infratemporal fossa
- Veins from anterior region of nasal cavities join the facial vein
Lymphatics of Nasal cavities
Ant and post regions
- Anterior region
- submandibular nodes
- Posterior region
- Deep cervical nodes, retropharyngeal nodes
Nasal septum
Composed of 5
- Perpendicular plate of ethmoid bone
- Vomer
- Cartilage of septum
- Crest of maxillary
- Crest of palatine
Nasal cavity gateways and what travels through them
Foramen cecum
Cribriform plate
Sphenopalatine plate 3
Incisive 2
- Foramen cecum
- Emissary veins (connect cavernous sinus and pterygoid plexus)
- Cribriform plate
- CN I
- Sphenopalatine formen
- Superior nasal meatus
- Sphenopalatine a.
- V2- Nasopalatine and Nasal
- Incisive
- Greater palatine artery
- Nasopalatine V2
Nasal cavity gateways
Small lateral wall foramina
Nares 2
- Small lateral wall foramina
- Greater palatine n nasal branches of V2
- Nares
- Infra orbital nerve of V2 nasal branches
- Alar nerve
4 Paranasal sinuses
Histo
Innervation
- Ethmoid air cells
- Sphenoid sinuses
- Maxillary sinuses (first to develop)
- Frontal sinuses
- Lined by respiratory mucosa, cilliated, and mucous secreting
- Open into nasal cavities
- Innervated by CN 5 branches
Paranasal sinus drainage
Paranasal sinus and nasolacrimal drain into nasal cavities
Frontal sinuses
Superior
Inferior
Anterior
Posterior
Medial
- Superior
- anterior cranial fossa
- Inferior
- orbit, ethmoidal sinuses, nasal cavity
- Anterior
- Forehead, superciliary arches
- Posterior
- Anterior cranial fossa
- Medial
- Other frontal sinuses
Frontal sinuses
drainage
Innervation
- Middle meatus
- via frontonasal dusct and semilunar haitus
- Innervation
- V1
- Supraorbital n. and supratrochlear
- V1
Frontal nasal
Arterial supply 3
Lymphatics
- Arterial supply
- Anterior ethmoid
- Supraorbital
- supratrochlear
- (From ICA of opthalmic)
- Lymphatics
- Submandibular nodes
Ethmoid air cells
Drainage
Innervation 2
- Drain
- Posterior ethmoid into superior meatus
- Anterior and middle ethmoid into meatus
- Innervation V1
- Anterior ethmoid
- Post ethmoid
Ethmoidal sinus
Arterial supply 3
Lymphatics 2
- Arterial supply
- ICA
- Anterior and posterior ethmoid
- ECA
- Posterior lateral nasal branches of sphenopalatine a.
- ICA
- Lymphatics
- Submandibular nodes
- retropharyngeal nodes
Spenoid Sinus
drain
innervtion
arterial
lymphatics
- Drain
- Sphenoethmoidal recess
- Innervation
- Post ethmoid n, V1
- Arterial supply
- ICA–> Post ethmoid a.
- ECA–> Pharyngeal a.
- Retropharyngeal nodes
Maxillary sinus relations
Superior
inferior
mmedial
lateral and anterior
posterior
- Superior
- Orbit
- infraorbital n
- infraorbital a and v
- Inferior
- Roots of molars and premolars
- Medial
- Nasal cavity
- Lateral and anterior
- Cheek
- Posterior
- infratemporal fossa
- pterygopalatine fossa
Maxilary sinus
drain
innervation
arterial
lympatics
- Drain
- Middle meatus via semilunar hiatus
- Innervation
- ASA, MSA, PSA V2
- Arterial supply
- Eca
- ASA MSA PSA
- Infraorbital
- Eca
- Submandibular nodes
Paranasal sinus drainage
- Sphenoethmoidal recess
- Sphenoid sinus
- Superior meatus
- Posterior ethmoid cells
- Middle meatus
- Anterior and middle ethmoid cells
- Frontal sinus
- Maxillary sinus
- Inferior meatus
- Nasolacrimal duct
