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RAD125 Skull
Skull Anatomy
| Question | Answer |
|---|---|
| The cranial bones are rigidly jointed together by articulations called: | sutures |
| The opening into the apex of the orbit for the transmission of the optic nerve and ophthalmic artery is called the: | optic foramen |
| What is centered to the IR for a parietoacanthial projection of the facial bones? | Acanthion |
| Which two are clearly demonstrated within the foramen magnum during an AP axial (Towne) projection of the skull? Posterior Clinoids Sella Turcica Anterior Clinoids Dorsum sellae | Posterior Clinoids Dorsum sellae |
| Which of the following skull types is considered average in size and shape? | Mesocephalic |
| The large aperture in the occipital bone, through which the medulla oblongata and spinal cord exit, is termed the: | foramen magnum |
| which skull type is narrow from side to side? | Dolichocephalic |
| Which skull suture is found between the frontal and parietal bones? | Coronal |
| Which skull suture is located between the parietal bones? | Sagittal |
| which facial bone contains a foramen through which the tear duct passes? (hint: smallest bone in the skull) | Lacrimal |
| Which skull suture is between the temporal bones and the parietal bones? | Squamosal |
| The posterior half of the base of the cranium is formed by which bone? | Occipital |
| Which of the following lines is placed perpendicular to the image receptor plane for the AP axial (Towne) projection? | OML |
| All of the following are facial bones except the: maxillae zygomatic bones ethmoid mandible | ethmoid |
| The largest sinus is the: | maxillary |
| What age is the cranium fully developed to adult size? | 12 years of age |
| Which line should be placed parallel to the plane of the IR for the SMV projection of the cranial base? | Infraorbitomeatal line (IOML) |
| For a lateral projection of the facial bones, the image receptor is centered to the: | zygomatic bone |
| For an SMV projection of the cranial base, the central ray enters the MSP of the throat between the angles of the mandible and passes through a point _________ inches anterior to the level of the EAM. | 3/4 |
| the central ray and center of the IR position for a lateral projection of the skull is _______ inch(es) _________ the EAM. | 2; above |
| The parietoacanthial projection of the facial bones is commonly called the ________ method. | Waters |
| What is the average central ray angulation for the PA axial (Haas) Projection of the skull? | 25 degrees cephalad |
| The largest, most dense bone of the face is the: | mandible |
| Which one of the following is a function of the sinuses? Decrease the weight of the skull Deepens the voice Cool and dry inhaled air Impair respiration | Decrease the weight of the skull |
| The respiration phase for all projections of the facial bones and sinuses is: | suspended |
| Which of the following is true regarding the lateral projection of the nasal bones? 1. MSP is parallel with the tabletop 2. Both sides are done for comparison 3. The interpupillary line is perpendicular to the tabletop | 1, 2, and 3 |
| Which of the following is located in the internal ear? Concha Semicircular canals Auditory tube Tympanic Membrane | Semicircular Canals |
| Which plane of the head is placed parallel to the plane of the IR for a lateral projection of the skull? | MSP |
| How many bones make up the cranium? | 8 |
| The zygomatic arches are a part of which bone? | Temporal |
| Which method of examining the skull will demonstrate the petrous ridges in the orbits, the ethmoid and frontal sinuses, and the crista galli? | Caldwell |
| For a lateral projection of the facial bones, the central ray will enter: | Halfway between the outer canthus and the EAM |
| The ethmoidal sinuses are located within which portion of the bone? | Labyrinths |
| For the Waters method of the facial bones, the orbitomeatal line is placed at what angle to the IR? | 37 degrees |
| How many bones make up the face? | 14 |
| Which sinus is projected through the mouth on the open-mouth modification of the Waters method? | Sphenoidal |
| For the tangential projection of the zygomatic arch, the head is positioned so that the midsagittal plane of the skull is ______ degrees _____ this side being examined. | 15; toward |
| which bone in the skull contains the auditory organs and the organs of hearing? | Temporal |
| Which part of the patient's face is touching the upright bucky, or table, for a parietoachanthial projections (Waters method)? | Chin |
| The small bone situated at he base of the tongue is the: | hyoid |
| What are the bones of the orbit? | Maxilla Lacrimal Palatine Ethmoid Frontal Zygoma Sphenoid |
| Where does the central ray exit for the PA axial (Caldwell) projection of the skull? | Nasion |
| Which structure of the sphenoid supports the pons of the brain? | Clivus |
| How many bones are contained in the skull? | 22 |
| If the patient cannot flex the neck to place the orbitomeatal line perpendicular to the image receptor for an AP axial (Towne) projection, which line should be placed perpendicular? | Infraorbitomeatal Line (IOML) |
| What must be projected below the maxillary sinuses for the parietoacantial projection (Waters method) of the sinuses? | Petrous Ridges |
| The central ray angle for the PA axial (Caldwell) projection of the skull is: | 15 degrees Caudal |
| What is perpendicular to the image receptor plane for a Caldwell projection of the skull? | OML |
| Which projection of the skull requires MSP be positioned parallel and interpupillary line perpendicular to the IR plane? | Lateral |
| Which two facial bones form the room of the mouth? | Maxillae and Palatine bones |
| All of the following are cranial bones except the: sphenoid occipital maxillae frontal | maxillae |
| All of the following bones contain air sinuses except: ethmoid frontal parietal sphenoid | parietal |
| The six areas of incomplete ossification in a newborn infant are called: | fontanelles |
| What is placed perpendicular to the IR for the acanthioparietal projection (revers Waters method) of the facial bones? | MML |
| How many bones compose the bony orbit? | 7 |
| Which reference line is perpendicular to the IR for the PA and PA axial mandibular rami? | OML |
| Often a patient cannot be turned into the prone position for a PA axial projection of the skull (Caldwell method). What central ray angle would be used if the AP axial projection is used instead? | 15 degrees cephalic |
| Which bone has condyles that articulate with the atlas of the cervical spine? | Occipital |
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