Respiratory System Anatomy - Paranasal sinuses
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| What is an air sinus? | A space in the bone lined by thin respiratory mucosa with a few goblet cells and glands
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| What is the function of the paranasal sinuses? | 1) Resonance of the voice
2) Decrease the weight of the skull
3) Protection
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| Change in voice indicates: | Sinusitis
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| Describe the frontal air sinus: | It lies in the frontal bone of the skull and is triangular in shape
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| Where does the frontal air sinus drain? | In the infundibulum at the level of the middle meatus
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| The frontal air sinus is innervated by: | The supraorbital nerve which arises from the supraorbital foramen
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| The Ethmoidal air sinuses are divided into: | Anterior, middle, and posterior ethmoidal cells
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| The posterior drains into the: | Superior meatus
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| The anterior and middle drain into the: | Middle meatus
Anterior --> semilunaris
Middle --> Bulla ethmoidalis
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| 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
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| Maxillary air sinus drainage: | Bad venous drainage, because its opening is high up
Opens into the middle meatus
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| Extraction of one molar tooth causes : | Fistula formation and drainage of the maxillary sinus
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| How is this treated? | By an incision anterior to the lower part of the maxillary air sinus
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| The maxillary air sinus is innervated by: | The infraorbital nerve and anterior superior alveolar branches from the maxillary nerve
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| 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
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| 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
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| Where does the sphenoid air sinus drain? | The sphenoethmoidal recess
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| A tumor in the pituitary gland can affect which sinus? | The sphenoid air sinus
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| What is the innervation of the sphenoid air sinus? | Posterior ethmoidal branch of opthalmic
Orbital branches from the maxillary
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| 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
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