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17 Cards in this Set

  • Front
  • Back
Anterior ethmoidal nerve
Branch from opthalmic (V1)

Sensory branches to lateral and medial aspect of the nasal cavity before it terminates as external nasal nerve at the tip of the nose.
Nasopalatine nerve
From Maxillary nerve (V2)

Runs on either side of the vomer and then enters incisive canal in hard palate. Communicates with the greater palatine branch of the maxillary nerve.
Greater palatine nerve
From Maxillary nerve (V2)

Runs through and on the under surface of the hard palate where it communicates with the nasopalatine nerve.
Pterygopalatine ganglion
Suspended from maxillary nerve (V2) in the pterygopalatine fossa.

Post synaptic nerves from pterygopalatine ganglion (PG) allow you to lacrimate and innervates nasopalatine glands which produce mucus.

Motor parasympathetic through the greater petrosal nerve.

Sympathetic motor fibers from the carotid plexus.
Sphenopalatine artery
A terminal branch of the maxillary artery. Enters nasal cavity through sphenopalatine foramen, and then branches into multiple arteries that supply the nasal cavity.
Blood supply of nasal cavity
Sphenopalatine, anterior and posterior ethmoidal arteries (from ophthalmic), greater palatine artery (from maxillary), and superficially from the facial artery.
Kiesselbach’s (or Little’s) area
Important clinical anastomosis from branches of internal carotid artery (ophthalmic) and branches of external carotid artery in a portion of the nasal cavity. Most common site of epistaxis (hemorrhaging through eroded mucosa).
Frontal sinus
Drains into the middle meatus through frontonasal duct.

Innervation through supraorbital (V1)
Ethmoid sinuses
Three groups depending on where they drain (Posterior, Middle, and Anterior)

Anterior - semilunar hiatus

Middle - Semilunar hiatus via the ethmoidal bulla or middle meatus

Posterior - Superior meatus

Innervation primarily from anterior and posterior ethmoidal nerves, additionally innervated by branches from PG.
Sphenoid sinus
Most variable sinus. Drains into small groove between the superior concha and the sphenoid bone called the sphenoethmoidal recess.

Innervation from posterior ethmoidal nerve and through branches from PG.

1. Optic nerve can be intimately related to the superior-lateral part of sphenoid sinus.
2. Internal carotid artery often erodes into bony border of sphenoid sinus, as there is little separating these two structures.
3. Maxillary nerve and nerve to the pterygoid canal (runs in floor of sphenoid air sinus) are intimately related to sinus.
Maxillary sinus
Most commonly infected.

Drains into semilunar hiatus.

Innervated by anterior, middle, and posterior superior alveolar nerves.
Anterior and middle superior alveolar nerves, posterior superior alveolar nerves.
Branches from infraorbital nerve (V2). End in the upper teeth.
Pterygopalatine fossa: Arteries
Posterior superior alveolar, descending palatine, pterygoid canal, pharyngeal, sphenopalatine.
Pterygopalatine fossa: Canals
Vidian (also known as pterygoid canal), vomerovaginal, palatovaginal, greater palatine canal.
Pterygopalatine fossa: Foramina
Rotundum (v2 exiting middle cranial fossa), sphenopalatine (main passageway between infratemporal fossa and nasal cavity)
Pterygopalatine fossa: Fissures
Two fissures: inferior orbital, pterygomaxillary
Roots of pterygopalatine ganglion
Parasympathetic root via greater petrosal nerve

Sympathetic root via deep petrosal nerve (carotid plexus)

Small sensory root that is suspended from maxillary nerve