Skull and Spine Review

The widest portion of the entire skull is located between the ________.

• Glabella and bregma

• Bregma and lambda

• Greater wings of the sphenoid

• Parietal tubercles

Which aspect of the skull is most vulnerable to fracture?

• Petrous portion of temporal bone

• Squamous portion of temporal bone

• Orbital plate of frontal bone

• Squamous portion of occipital bone

Which division of the ear contains the cochlea?

• Interal

• Middle

• External

• Aditus

The midline point at the junction of the upper lip and the nasal septum is called the:

• Glabella

• Nasion

• Acanthion

• Mentum

There is a _____ difference between the IOML and OML baselines.

• 7° to 8°

• 2° to 3°

• 5°

• 10° to 12°

How much CR angle is required for the AP axial Towne projection of the skull if the IOML is perpendicular to the IR?

• 25⁰

• 30⁰

• 37⁰

• 40⁰

Which positioning error is present if the orbital plates are not superimposed on a lateral skull radiograph?

• Incorrect CR angle

• Excessive flexion

• Rotation

• Tilt

Which variation of the PA (axial) projection of the skull has been performed if the petrous ridges are at the level of the supraorbital margin?

• PA 0⁰

• PA 15⁰

• PA 25⁰

• PA 30⁰

Which of the cranial bones contains the foramen ovale, foramen spinosum and foramen rotundum?

• Frontal

• Ethmoid

• Sphenoid

• Temporal

What is the name for the most anterior junction point of the sutures of the skull?

• Bregma

• Lambda

• Asterion

• Pterion