Frontonasal Duct

The frontal air sinuses are lined by mucous membrane, and each communicates with the corresponding nasal cavity by means of a passage called the frontonasal duct.

This infundibulum located within the ethmoid bone connects the nasal cavity with the frontal air sinuses.

Bones of head and neck: the neurocranium of the skull (TA A02.1.01–07, GA 2.129–155)
Occipital
Squama
  • external
    • Inion/External occipital protuberance
    • External occipital crest
    • Nuchal lines
  • planes
    • Occipital
    • Nuchal
  • internal
    • Cruciform eminence
    • Internal occipital protuberance
    • Sagittal sulcus
    • Internal occipital crest
Lateral parts
  • Condyle
    • Condyloid fossa
    • Condylar canal
  • Hypoglossal canal
  • jugular
Basilar part
  • Pharyngeal tubercle
Other
  • Foramen magnum
    • Basion
    • Opisthion
Parietal
  • Parietal eminence
  • Temporal line
  • Parietal foramen
  • Sagittal sulcus
Frontal
Squama
  • Frontal suture
  • Frontal eminence
  • external
    • Superciliary arches
    • Glabella
  • foramina
    • Supraorbital
    • Cecum
  • Zygomatic process
  • internal
    • Sagittal sulcus
    • Frontal crest
Orbital part
  • Ethmoidal notch
  • Fossa for lacrimal gland
  • Trochlear fovea
  • Frontal sinus
  • Frontonasal duct
Temporal
Squama
  • Articular tubercle
  • Suprameatal triangle
  • Mandibular fossa
  • Petrotympanic fissure
  • Zygomatic process
Mastoid part
  • Mastoid foramen
  • Mastoid process (Mastoid cells)
  • Mastoid notch
  • Occipital groove
  • Sigmoid sulcus
  • Mastoid antrum (Aditus)
Petrous part
  • Carotid canal
  • Facial canal (Hiatus)
  • Internal auditory meatus
  • Cochlear aqueduct
  • Stylomastoid foramen
  • fossae
    • Subarcuate fossa
    • Jugular fossa
  • canaliculi
    • Inferior tympanic
    • Mastoid
  • Styloid process
  • Petrosquamous suture
  • (note: ossicles in petrous part, but not part of temporal bone)
Tympanic part
  • Suprameatal spine
Sphenoid
Surfaces
  • Superior surface: Sella turcica
    • Dorsum sellae
    • Tuberculum sellae
    • Hypophysial fossa
    • Posterior clinoid processes
  • Ethmoidal spine
  • Chiasmatic groove
  • Middle clinoid process
  • Petrosal process
  • Clivus
  • Lateral surface: Carotid groove
  • Sphenoidal lingula
  • Anterior surface: Sphenoidal sinuses
Great wings
  • foramina
    • Rotundum
    • Ovale
    • Vesalii
    • Spinosum
  • Spine
  • Infratemporal crest
  • Sulcus for auditory tube
Small wings
  • Superior orbital fissure
  • Anterior clinoid process
  • Optic canal
Pterygoid
processes
  • fossae
    • Pterygoid
    • Scaphoid
  • pterygoid plates
    • Lateral
    • Medial
  • Pterygoid canal
  • Hamulus
Other
  • Body
  • Sphenoidal conchae
Ethmoid
Plates
  • Cribriform plate
    • Crista galli
    • Olfactory foramina
  • Perpendicular plate
Surfaces
  • Lateral surface Orbital lamina
  • Uncinate process
  • Medial surface Superior nasal concha
  • Superior meatus
  • Middle nasal concha
  • Middle meatus
Labyrinth
  • Ethmoid sinus
  • ethmoidal foramina
    • Posterior
    • Anterior

M: BON/CAR

anat (c/f/k/f, u, t/p, l)/phys/devp/cell

noco/cong/tumr, sysi/epon, injr

proc, drug (M5)

Head and neck, upper RT: Nose (TA A06.1, TH H3.05.01, GA 10.992)
External nose

Ala of nose

nasal cartilages (of the septum, Greater alar, Lesser alar, Lateral nasal, Accessory nasal, Vomeronasal)
Nasal cavity
Openings Nasal vestibule · Nostril · Posterior nasal apertures
Lateral wall

Nasal concha/meati: Superior nasal concha · Middle nasal concha · Inferior nasal concha · Superior nasal meatus · Middle nasal meatus · Inferior nasal meatus

Sphenoethmoidal recess · Ethmoid bulla · Agger nasi · Ethmoidal infundibulum · Semilunar hiatus · Maxillary hiatus
Medial wall Nasal septum · Vomeronasal organ
Mucous membrane Olfactory mucosa
Paranasal sinuses Maxillary sinus · Sphenoidal sinuses · Frontal sinus · Ethmoid sinus
Naso-pharynx Pharyngeal opening of auditory tube (Salpingopharyngeal fold, Salpingopalatine fold, Torus tubarius) · Pharyngeal tonsil · Pharyngeal recess

M: RES

anat (n, x, l, c)/phys/devp

noco (c, p)/cong/tumr, sysi/epon, injr

proc, drug (R1/2/3/5/6/7)


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Other articles related to "frontonasal duct":

Semilunar Hiatus - Sinus Drainage
... Following the curve anteriorly leads into the infundibulum of the frontonasal duct, which drains the frontal sinus ... In slightly over 50% of subjects, this is directly continuous with the frontonasal duct from the frontal air sinus ... fuses with the front part of the bulla, however, this continuity is interrupted and the frontonasal duct then drains directly into the anterior end of the middle meatus ...