Test 1: Skull And Sinuses Flashcards
Which landmark is between the eyebrows
Glabella
What is the top portion of the skull
Vertex
The mental point is located where
The chin
Which Skull shape is very short from front to back with the Petrous ridges at a 45° angle
Brachycephalic
Which baseline dissects the pupils
Interpupillary
Which baseline connects the outer canthus to the EAM
Orbitommeatal line (OML)
How many bones are found in the cerebral cranium
8
Which cranial bones forms the posterior part as well as the base of the skull
Occipital
Which cranial bones lies in the anterior base of the skull
Frontal
The area where the parietal bones meet the frontal bone is known as the
Ethmoid
What is the name of the suture between the occipital and parietal bones
Lambdoidal suture
What is the name of the suture between the temporal and parietal bones
Squamosal suture
Name the areas of incomplete fusion found in newborns
Fontanelles
What portion of the occibital bone are the jugular foramens found
Lateral portion
Between what two bony structures can the head be measure to determine it’s with
Parietal eminences and frontal squamous
Squamous means
Flat
What portion of the Temporal bone contains the organs of hearing
Petrous
What is the name of the pointed process extending from the Tympanic portion of the Temporal bone
Styloid process
Which portion of the Temporal bone contains the mandibular fossa
Squamous
And which bone does the sella turcica lie
Sphenoid
The anterior clinoid process is located on which portion of the sphenoid bone
The lesser wing
The ethmoid sinuses are located where
Lateral masses or ladyrinths
The Crista galli Is located on which portion of the ethmoid bone
Cribriform plate
In which section of the sphenoid bone is the foramen ovale located
The greater wing
The optic foramen is located in which bone
Sphenoid
Which portion of the ethmoid bone helps form the bony nasal septum
Perpendicular plate
Which sinus group is well developed at birth
Maxillary
What are the function of the sinuses
1) Decreased weight of cranium
2) Warm And moisten air
3) Shock absorbers for trauma
Why are sinus views performed upright
To demonstrate fluid
What is the second largest sinus group
Frontal
In the lateral Skull projection which baseline is perpendicular to the image receptor
Interpupillary
Where is the central ray location for the lateral skull production
2” superior to EAM
How can you determine you have a good lateral skull radiograph
Orbital roofs are superimposed
In the PA skull projection, Which baseline is perpendicular to the IR
Orbitomeatal line (OML)
In the PA skull projection, where are the Petrous ridges located?
Lower 1/3 of the orbits (middle orbits)
Where is the central ray exit point for a PA skull
Perpendicular through nasion
Which cranial bone is best demonstrated on a PA skull radiograph
Frontal
In the AP axial projection for skull, How many degrees and in which direction is the tube angled if the IOML is perpendicular
37° caudad
Where does the central ray enter for a Towns view
30° caudad, 2-2 1/2” above glabella
What structures are demonstrated within the foramen magnum in an AP axial projection
Dorsum Sellae and posterior Clinoid processes
Which sinus projection best demonstrates all for sinus groups
Lateral
If the orbitomeatal line (OML) Is perpendicular in a PA Caldwell projection, How many degrees and in which direction is the tube angled
15° caudad
How many degrees does the orbitomeatal line Form to the table in a Parietoacanthial projection
37°
Where are the Petrous Ridge located in a water’s view for sinuses
Below the maxillary sinuses
Where are the Petrous ridges located in a PA Caldwell projection?
Lower 1/3 of the orbits
Which sinus group is best demonstrated in an SMV projection?
Sphenoid
Where is the central ray location for a lateral sinus projection
Horizontal, perpendicular 1/2-1” inferior to the outer canthus
Which baseline is utilized in a submentovertical (SMV) projection?
Infraorbitomeatal line (IOML)
In the open mouth waters projection, which sinus group is best demonstrated
Sphenoid sinuses
Which projection best demonstrates the maxillary sinuses
Parietoacanthial (PA Waters’s)
What are the bones within the middle ear
Tympanic cavity
Tympanic membrane
Auditory ossicles
What is the function of the tympanic cavity and which part of the ear is it located
Communicates with the nasal pharynx through the auditory tube
Found in the middle ear
What is the function of the Tympanic membrane and where is it found within the ear
Transmission of sound vibrations
Found in the middle ear
What are the functions of the auditory ossicles and where is it located within the ear
Permit vibratory motion
Found in the middle ear
What are the bones within the inner ear
Cochlea
Vestibule
Semi-circular canals
What is the function of the cochlea and where is it found within the ear
For hearing
Found in inner ear
What are the functions for the vestibule and semicircular Canals and where are they located within the ear
For balance
Found in inner ear
Which parts of the inner ear are located in the petrous portion
Vestibule and semi-circular canals
What bones are found in the outer ear
Auricle and EAM
What is the function of the auricle bone and where is it located within the ear?
It’s an oval shaped sound collecting organ
Found in outer ear
What is the function of the EAM and where is it found within the ear
Sound conducting canal
Found in the outer ear
