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RS Anatomy
Respiratory System Anatomy - Paranasal sinuses
| Question | Answer |
|---|---|
| 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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