SKULL ANATOMY TEXTBOOK 4. EXAM
QUESTIONS AND ANSWERS 100% PASS.
What is the only movable joint in the skull? - ANS The Temporomandibular Joint (TMJ)
What type of joint is the TMJ classified as? - ANS A synovial joint (diarthrodial)
What are the two main movements of the TMJ? - ANS Hinge-type motion and gliding
movement
What is the purpose of the articular fibrous disk in the TMJ? - ANS It divides the joint into
upper and lower synovial cavities
What type of joint is classified as synarthrodial and immovable in the skull? - ANS Fibrous
joints, including sutures and gomphosis
What is a gomphosis? - ANS A type of fibrous joint found between the roots of teeth and the
alveolar processes
What happens to the condyle during wide mouth opening? - ANS The condyle moves forward
to the front edge of the fossa
What can cause dislocation of the TMJ? - ANS Excessive anterior movement of the condyle or
force
2026 STUDY MATERIAL @COPYRIGHT RESERVED 1
, What are the four groups of paranasal sinuses? - ANS Maxillary, Frontal, Ethmoid, and
Sphenoid
Which paranasal sinuses are part of the facial bone structure? - ANS Only the maxillary
sinuses
What is the average vertical dimension of the maxillary sinuses? - ANS 1 to 1½ inches (2.5 to
4 cm)
What is the purpose of the paranasal sinuses? - ANS To assist in vocal resonance, lighten the
skull, and produce mucus
When do the frontal and sphenoid sinuses begin to be visible on radiographs? - ANS At age 6
or 7
What is the anatomical location of the frontal sinuses? - ANS Between the inner and outer
tables of the skull, posterior to the glabella
What characterizes the ethmoid sinuses? - ANS They are grouped into anterior, middle, and
posterior collections and intercommunicate
Where are the sphenoid sinuses located? - ANS In the body of the sphenoid bone directly
below the sella turcica
What can cause pathologic changes in the sphenoid sinuses? - ANS Trauma to the skull may
demonstrate air-fluid levels
What is the communication site for the maxillary sinuses? - ANS The opening into the middle
nasal meatus passageway
What is the average size variation of maxillary sinuses? - ANS They can vary in size from one
person to another and sometimes from one side to the other
2026 STUDY MATERIAL @COPYRIGHT RESERVED 2
QUESTIONS AND ANSWERS 100% PASS.
What is the only movable joint in the skull? - ANS The Temporomandibular Joint (TMJ)
What type of joint is the TMJ classified as? - ANS A synovial joint (diarthrodial)
What are the two main movements of the TMJ? - ANS Hinge-type motion and gliding
movement
What is the purpose of the articular fibrous disk in the TMJ? - ANS It divides the joint into
upper and lower synovial cavities
What type of joint is classified as synarthrodial and immovable in the skull? - ANS Fibrous
joints, including sutures and gomphosis
What is a gomphosis? - ANS A type of fibrous joint found between the roots of teeth and the
alveolar processes
What happens to the condyle during wide mouth opening? - ANS The condyle moves forward
to the front edge of the fossa
What can cause dislocation of the TMJ? - ANS Excessive anterior movement of the condyle or
force
2026 STUDY MATERIAL @COPYRIGHT RESERVED 1
, What are the four groups of paranasal sinuses? - ANS Maxillary, Frontal, Ethmoid, and
Sphenoid
Which paranasal sinuses are part of the facial bone structure? - ANS Only the maxillary
sinuses
What is the average vertical dimension of the maxillary sinuses? - ANS 1 to 1½ inches (2.5 to
4 cm)
What is the purpose of the paranasal sinuses? - ANS To assist in vocal resonance, lighten the
skull, and produce mucus
When do the frontal and sphenoid sinuses begin to be visible on radiographs? - ANS At age 6
or 7
What is the anatomical location of the frontal sinuses? - ANS Between the inner and outer
tables of the skull, posterior to the glabella
What characterizes the ethmoid sinuses? - ANS They are grouped into anterior, middle, and
posterior collections and intercommunicate
Where are the sphenoid sinuses located? - ANS In the body of the sphenoid bone directly
below the sella turcica
What can cause pathologic changes in the sphenoid sinuses? - ANS Trauma to the skull may
demonstrate air-fluid levels
What is the communication site for the maxillary sinuses? - ANS The opening into the middle
nasal meatus passageway
What is the average size variation of maxillary sinuses? - ANS They can vary in size from one
person to another and sometimes from one side to the other
2026 STUDY MATERIAL @COPYRIGHT RESERVED 2
