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RS Anatomy

Respiratory System Anatomy - Paranasal sinuses

QuestionAnswer
What is an air sinus? A space in the bone lined by thin respiratory mucosa with a few goblet cells and glands
What is the function of the paranasal sinuses? 1) Resonance of the voice 2) Decrease the weight of the skull 3) Protection
Change in voice indicates: Sinusitis
Describe the frontal air sinus: It lies in the frontal bone of the skull and is triangular in shape
Where does the frontal air sinus drain? In the infundibulum at the level of the middle meatus
The frontal air sinus is innervated by: The supraorbital nerve which arises from the supraorbital foramen
The Ethmoidal air sinuses are divided into: Anterior, middle, and posterior ethmoidal cells
The posterior drains into the: Superior meatus
The anterior and middle drain into the: Middle meatus Anterior --> semilunaris Middle --> Bulla ethmoidalis
Describe the maxillary air sinus: Can be shown in x ray Located at the maxilla and pyramidal in shape Becomes larger with enlargement of facial bones Apex directed laterally towards the zygomatic arch Base on lateral wall of nose
Maxillary air sinus drainage: Bad venous drainage, because its opening is high up Opens into the middle meatus
Extraction of one molar tooth causes : Fistula formation and drainage of the maxillary sinus
How is this treated? By an incision anterior to the lower part of the maxillary air sinus
The maxillary air sinus is innervated by: The infraorbital nerve and anterior superior alveolar branches from the maxillary nerve
What are the relations of the maxillary air sinus? Above: Orbital plate Below: Upper molar teetn and premolars Behind: Infratemporal fossa Medial: Lower part of the nasal cavity
Describe the sphenoid air sinus: Located in the body of the sphenoid bone and above it, is the pituitary gland which lies in the sella turcica
Where does the sphenoid air sinus drain? The sphenoethmoidal recess
A tumor in the pituitary gland can affect which sinus? The sphenoid air sinus
What is the innervation of the sphenoid air sinus? Posterior ethmoidal branch of opthalmic Orbital branches from the maxillary
What are the relations of the sphenoid air sinus? Above: The pituitary gland and optic chiasma Laterally: The cavernous sinus which contains nerves (like the abducens nerve) and internal carotid artery Below and in front: The nasal cavity
Created by: Ulaisl
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