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SOMI Chapter 11

Skull, Facial bones, Nasal bones, Orbits, and Sinuses

QuestionAnswer
How many cranial bones are there? 8
How many facial bones are there? 14
The cranium is divided into 2 sections, what are they? calvarium (skullcap)and the floor
What is the name of the hole in the occipital bone that the spinal cord passes through as it exits the brain? foramen magnum
What gland is housed in the sella turcica? pituitary gland
What cranial bone is the only one that articulates with all seven of the other cranial bones? sphenoid bone
How many fontanels are there in a new born baby? 6
Which 2 facial bones do not appear as a set? vomer and mandible
What is the only movable facial bone? mandible
At what age does the mandible become one solid bone? approximately age one
What are the only 2 movable joints in the skull? temporomandibular joints
Which sinuses where originally known as the antrum of Highmore? maxillary sinuses
Which sinuses rarely become aerated before age six? frontal sinuses
How many bones make up the orbits? 7
How many positioning lines originate from the external acoustic meatus? 6
What is the difference in degree between OML and the IOML? 7-8 degrees
What are the 2 most common positioning errors in headwork? rotation and tilt
What lines are used for positioning a Skull series Towne method? OML or IOML
What direction and degree of angulation is used for a Towne using the OML? IOML? 30 degrees caudad for OML and 37 degrees caudad for IOML
Where do you center for a skull series Towne projection? center at MSP 2 1/2 inches above the glabella
Where do you center the CR on a lateral skull projection? 2 inches superior to EAM
What line is perpendicular to the IR for a PA Caldwell projection of the skull? OML
What is the CR angle for and how is directed for a PA Caldwell of the skull? 15 degrees caudad and centered to exit at the nasion
What line is perpendicular for the PA projection of the skull? OML
Describe the CR for a PA projection of the skull. perpendicular to IR and exiting at the glabella
Where is the CR directed for a lateral facial bone projection? center to zygoma (prominence of cheek) which is midway between the outer canthus and EAM
What positioning line is perpendicular to the IR for a Waters projection of the facial bones? MML
Where is the CR directed to exit on a Waters view of the facial bones? acanthion
What line is perpendicular to the IR for a Caldwell projection of the facial bones? OML
How much and where is the CR angled on a Caldwell projection of the facial bones? 15 degrees caudad, to exit at the nasion
What positioning line is perpendicular to the IR when performing a modified Waters projection of the facial bones? LML
Where is the CR directed to exit on a Waters view of the facial bones? acanthion
What line is perpendicular to the IR for a Caldwell projection of the facial bones? OML
How much and where is the CR angled on a Caldwell projection of the facial bones? 15 degrees caudad, to exit at the nasion
What positioning line is perpendicular to the IR when performing a modified Waters projection of the facial bones? LML
Which positioning line is perpendicular to the IR during a lateral nasal bone projection? IPL
Where is the CR directed for a lateral nasal bone projection? 1/2 inferior to nasion
What are the 3 projections used for a sinus series? Lateral of affected side, PA (Caldwell method), Parietoacanthial (Waters method)
What is the most important thing you need for sinus projections? horizontal beam
Created by: xraydude
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