Multiple Choice
What is the large diamond-shaped muscle of the upper back?
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1. Introduction to Anatomy & Physiology
Introduction to Anatomical Terms for Body Regions
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Which of the following is not a paranasal sinus?
A
Sphenoid sinus
B
Frontal sinus
C
Mastoid sinus
D
Maxillary sinus
Verified step by step guidance1
Begin by understanding what paranasal sinuses are. Paranasal sinuses are air-filled spaces located within the bones surrounding the nasal cavity. They are lined with mucous membranes and have several functions, including lightening the weight of the skull, humidifying and heating inhaled air, and enhancing voice resonance.
Identify the common paranasal sinuses. The main paranasal sinuses include the frontal sinus, sphenoid sinus, ethmoid sinus, and maxillary sinus. These are located in different bones of the skull and are connected to the nasal cavity.
Examine the list of options provided in the problem. You have the sphenoid sinus, frontal sinus, mastoid sinus, and maxillary sinus.
Recognize that the mastoid sinus is not a paranasal sinus. The mastoid sinus, or mastoid air cells, are located in the mastoid process of the temporal bone, which is behind the ear. They are not connected to the nasal cavity and serve different functions related to the ear.
Conclude that the mastoid sinus is the correct answer to the question of which is not a paranasal sinus, based on its location and function.
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