Quiz 17: Skull,facial Bones,and Paranasal Sinuses

How many bones comprise the skull? A) 14 B) 18 C) 22 D) 31

Which of the following bones are categorized as cranial bones? 1) Maxilla 2) Ethmoid 3) Parietal A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2, and 3

Which of the following cranial bones are paired (right and left)? 1) Frontal 2) Parietal 3) Temporal A) 1 only B) 1 and 2 only C) 2 and 3 only D) 1, 2, and 3

The bony prominence on the frontal bone between the eyebrows is called the: A) acanthion. B) glabella. C) gonion. D) nasion.

What is the medical term for the bony sockets that house the eyes? A) Eye sockets B) Supraorbital margins C) Glabella D) Orbits

Which cranial bone is most posterior? A) Occipital bone B) Frontal bone C) Mandible D) Parietal bone

Which cranial bone is most anterior? A) Occipital bone B) Frontal bone C) Parietal bone D) Temporal bone

Which cranial bone has a dense,pyramid of bone that houses the middle and inner ear structures? A) Occipital bone B) Frontal bone C) Parietal bone D) Temporal bone

What does the acronym "EAM" represent? A) External auditory meatus B) External anterior mastoid C) External anterior meatus D) External acoustic magnum

The mastoid process is part of the ______ bone(s). A) temporal B) occipital C) parietal D) frontal

What is the name of the articulation between the mandible and the cranium? A) Craniomandibular joint B) Temporomandibular joint C) Mastomandibular joint D) Mentomandibular joint

What is the term for the articulations between the cranial bones? A) Glabellae B) Sutures C) Acanthions D) Foramina

What is the name of the articulation between the frontal bone and the parietal bones? A) Squamosal suture B) Lambdoidal suture C) Coronal suture D) Sagittal suture

What is the name of the articulation between the parietal bones? A) Squamosal suture B) Lambdoidal suture C) Coronal suture D) Sagittal suture

What is the name of the articulation between the parietal bones and the occipital bone? A) Squamosal suture B) Lambdoidal suture C) Coronal suture D) Sagittal suture

What is the name of the articulation between the parietal bones and temporal bones? A) Lambdoidal suture B) Coronal suture C) Sagittal suture D) Squamosal suture

Where is the coronal suture? A) Between the frontal and parietal bones B) Between the right and left parietal bones C) Between the parietal bones and the temporal bones D) Between the parietal bones and the occipital bone

Where is the sagittal suture? A) Between the frontal and parietal bones B) Between the right and left parietal bones C) Between the parietal bones and the temporal bones D) Between the parietal bones and the occipital bone

Where is the lambdoidal suture? A) Between the frontal and parietal bones B) Between the right and left parietal bones C) Between the parietal bones and the temporal bones D) Between the parietal bones and the occipital bone

Where is the squamosal suture? A) Between the frontal and parietal bones B) Between the right and left parietal bones C) Between the parietal bones and the temporal bones D) Between the parietal bones and the occipital bone

Which of the following is the positioning landmark located at the junction of the nose and the upper lip? A) Glabella B) Acanthion C) Foramen magnum D) EAM

In which bone can the foramen magnum be found? A) Frontal B) Temporal C) Ethmoid D) Occipital

What is the foramen magnum? A) A large hole in the occipital bone B) A large hole in the zygoma C) The articulation between the mandible and the cranium D) The articulation between the parietal bones

What structure serves as the passageway for the spinal cord to exit the skull and pass into the spinal canal of the vertebral column? A) EAM B) Foramen magnum C) Sella turcica D) Crista galli

Which structure houses the pituitary gland? A) EAM B) Foramen magnum C) Sella turcica D) Crista galli

What is the sella turcica? A) A large hole in the skull that serves as the passageway for the spinal cord to exit the skull B) The structure that houses the organs for hearing and balance C) The structure that houses the pituitary gland D) An accessory sinus that occasionally forms during adolescence

The sella turcica is located on the ______ bone. A) frontal B) ethmoid C) occipital D) sphenoid

The EAM is located in the ______ bone. A) temporal B) ethmoid C) occipital D) frontal

What is contained within the petrous pyramids? A) Air cells B) Middle and inner ear structures C) Pituitary gland D) Spinal cord

The petrous pyramid is a portion of which bone? A) Sphenoid bone B) Ethmoid bone C) Temporal bone D) Occipital bone

Which is the only moveable facial bone? A) Maxilla B) Mandible C) Zygoma D) Lacrimal

What common positioning landmark is located on the anterior,lower margin of the mandible? A) Gonion B) Glabella C) Mental protuberance D) Mental foramen

What term is used to identify the angle of the mandible? A) Mental point B) Glabella C) Acanthion D) Gonion

Which of the following are facial bones? 1) Vomer 2) Mandible 3) Ethmoid A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2, and 3 only

Which facial bones contain the structures that hold the roots of the teeth? A) Mandible and maxillae B) Zygoma and maxillae C) Mandible and zygoma D) Maxillae and temporal

What is the name of the structure that holds the roots of the teeth? A) Petrous pyramids B) Gonion C) Alveolar process D) Sella turcica

Which facial bones help to form the hard palate of the mouth? A) Vomer B) Palatine C) Inferior nasal conchae D) Lacrimal

Which facial bone forms the inferior part of the nasal septum? A) Palatine B) Inferior nasal conchae C) Mandible D) Vomer

Air-filled cavities located in some bones of the face and cranium are called: A) cranial sutures. B) zygomatic prominences. C) paranasal sinuses. D) paranasal foramina.

Which of the following bones contain paranasal sinuses? 1) Frontal 2) Ethmoid 3) Temporal A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2, and 3

What positioning landmark is located at the inner corner of the eye? A) Inner canthus B) EAM C) Nasion D) Acanthion

The depression on the anterior surface of the skull between the orbits is called the: A) acanthion. B) inner canthus. C) infraorbital margin. D) nasion.

There are several imaginary lines used to position the skull and facial bones. Which imaginary line connects the outer corner of the eye to the EAM? A) The infraorbitomeatal line B) The orbitomeatal line C) The acanthiomeatal line D) The mentomeatal line

When taking a PA axial projection (Caldwell method)of the skull,the central ray is directed: A) 15 degrees cephalad. B) 15 degrees caudad. C) 30 degrees cephalad. D) 30 degrees caudad.

Which radiographic baseline is used to position the PA axial projection (Caldwell method)of the cranium? A) Either the OML or the IOML B) Mentomeatal C) IOML D) OML

What is the proper position of the radiographic baseline for the PA axial projection (Caldwell method)of the cranium? A) Perpendicular to IR B) Parallel with IR C) Perpendicular to CR D) 37 degrees from IR

Which projection of the cranium demonstrates the petrous ridges within the orbits? A) AP axial (Towne method) B) PA C) PA axial (Caldwell method) D) SMV

Which cranial projection best demonstrates the occipital bone? A) PA B) PA axial (Caldwell method) C) AP axial (Towne method) D) Lateral

Which projection of the cranium best demonstrates the frontal bone? A) AP axial (Towne method) B) Lateral C) SMV D) PA

If a patient has received a blow to the right side of the skull about 2 inches above the ear,which of the following demonstrates the possible injury? A) AP axial (Towne method) and SMV projections B) PA axial (Caldwell method) and SMV projections C) PA projection and lateral projection, right side of skull resting on the table D) PA projection and lateral projection, left side of skull resting on the table

The patient is in a prone,oblique position with the midsagittal plane of the head parallel to the IR and the interpupillary line perpendicular to the IR. The CR is directed perpendicular to enter 2 inches superior to the EAM. What projection of the cranium is demonstrated on the radiograph? A) Lateral B) AP axial (Towne method) C) PA axial (Caldwell method) D) PA

The patient is positioned supine with the midsagittal plane and OML perpendicular to the IR. The CR is angled 30 degrees caudal and enters MSP at approximately 2.5 inches superior to the glabella. What projection is imaged on the radiograph? A) Lateral B) PA axial (Caldwell method) C) PA D) AP axial (Towne method)

Which of the following are disadvantages of an AP projection of the cranium as compared with a PA projection? 1) Cannot be used on injured patients 2) Increased magnification of anterior anatomy 3) Increased radiation dose to eyes A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2, and 3

Which of the following demonstrates the structures of the cranial base? A) Lateral B) PA axial C) SMV D) PA

What cranial structures are best demonstrated by the SMV projection? A) The frontal bone and sinuses B) The cranial base C) The parietal bones D) The maxillary sinuses

A lateral projection of the face using detail screens tabletop (nongrid)is used to demonstrate the: A) mandible. B) zygoma. C) orbits. D) nasal bones.

Which projection of the facial bones requires the CR to exit the acanthion? A) AP axial (Towne method) B) PA axial (Caldwell method) C) Lateral D) Parietoacanthial (Waters method)

What is the purpose of performing sinus radiography with the patient in the upright position? A) To demonstrate air/fluid levels B) For ease of patient positioning C) To prevent superimposition of the cranial structures on the paranasal sinuses D) Sinus radiography does not have to be performed with the patient upright.

When the patient is supine,the midsagittal plane of the skull is perpendicular to the IR,the orbitomeatal line is perpendicular to the IR,and the central ray is angled 30 degrees caudad,the resulting radiograph demonstrates the: A) frontal bone. B) temporal bones. C) posterior parietal bones and the occipital bone. D) maxillary sinuses.

Which facial bones are demonstrated on the PA axial projection (Caldwell method)? A) Zygoma and maxilla B) Orbits and zygoma C) Nasal bones and orbits D) Mandible and maxilla

Which paranasal sinuses are best demonstrated on the PA axial projection (Caldwell method)? 1) Maxillary 2) Frontal 3) Ethmoid A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2, and 3

Which of the following projections demonstrates the sphenoid sinus? A) Parietoacanthial (Waters method) B) Lateral C) AP axial (Towne method) D) PA axial (Caldwell method)

Which paranasal sinuses are demonstrated by the parietoacanthial projection (Waters method)? 1) Maxillary 2) Frontal 3) Ethmoid A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2, and 3

Which projection best demonstrates the maxillary sinuses? A) Parietoacanthial (Waters method) B) SMV C) PA axial (Caldwell method) D) AP axial (Towne method)

Which paranasal sinuses are demonstrated by the lateral projection? 1) Sphenoid 2) Frontal 3) Ethmoid A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2, and 3

Which paranasal sinuses are demonstrated by the SMV projection? 1) Sphenoid 2) Ethmoid 3) Maxillary A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2, and 3

Which projection demonstrates all of the paranasal sinuses? A) PA axial (Caldwell method) B) Parietoacanthial (Waters method) C) Lateral D) SMV

What is the proper CR angle and direction for the axiolateral projection of the mandible when MSP of the head is angled 15 degrees toward the IR? A) 10 degrees cephalic B) 10 degrees caudal C) 25 degrees cephalic D) 25 degrees caudal

When the right and left halves of the skull do not appear symmetrical on a PA or AP projection,this is a sign that the: A) neck is extended too much. B) neck is flexed too much. C) sagittal plane is not perpendicular to the IR. D) central ray is not angled correctly.

A blow-out fracture involves the: A) occipital bone. B) mandible. C) nasal bones. D) floor of the orbit.

Which facial bone(s)is (are)most frequently fractured? A) Nasal bones B) Zygomatic arches C) Orbits D) Mandible

Which facial bone often sustains fractures in pairs? A) Maxilla B) Mandible C) Zygoma D) Vomer