Radiology and anatomy

Question 1

What is meant by:

Summation effect

Tangential effect

Answer 1

Summation effect is the result of superimposed tissue addding additional radioopacity or subracting from it if the superimposed structure is radiolucent (ie. air filled structure).

Tangential effect is where two dimentional details are diminished when they are perpendicular to the xray beam and are emphasized when they are parallel to the ray bearm.

Question 2

Name the two unpaired bones of the facial bones

Answer 2

Vomer

Hyoid

Question 3

What bones do the larimal bone articulate with?

Answer 3

Frontal bone

Maxilla

Palatine bone

Zygomatic bone

Ethmoid bone

Question 4

What lines the internal surface of the nasal bone?

Answer 4

Mucous membrane

Question 5

What bones does the nasal bone articulate with?

Answer 5

Frontal bone

Maxilla bone

Incisive bone

Question 6

Where does the infraorbital canal begin?

Answer 6

At the maxillary foramen

Question 7

Describe the location of the vomer bone.

What bones does the vomer articulate with?

Answer 7

The vomer bone is a single bone that extends from the base of the cranium to the upper surface of the hard palate. It forms the caudoventral part of the nasal septum.

The vomer articulates with the sphenoid bone, ethmoid bone, palatine bones, maxilla and incisive bones.

Question 8

What bones do the zygomatic bone articulate with?

Question 9

What does the zygomatic bone articulate with?

Answer 9

The zygomatic bone forms the zygomatic arch (rostral part) together with the zygomatic process of the temporal bone and maxilla.

It articulates with the maxilla, lacrimal a nd temporal bones.

Question 10

What bones does the incisive bone articulate with?

Answer 10

It articulates with the maxilla, vomer and nasal bone.

Question 11

What bone(s) is/are the palatine fissures in?

Answer 11

The incisive bone

Question 12

What does the vertical ramus of the mandible articulate with?

Answer 12

The temporal bone

Question 13

What is the interincisive canal?

Answer 13

The interincisive canal (canalis interincisivus) is a minute groove on the medial surface of each incisive bone which lines up with the contralateral groove to form the interincisive canal in the interincisive suture – and is for blood vessels.

Question 15

Label:

5.

6.

7.

12.

13.

14..

15.

20.

Answer 15

5. Alveolar margin, interdental (margo interalveolaris)
6. Alveolar margin, labial (margo alveolaris)
7. Alveolar margin, palatal (margo alveolaris
8. Incisive canal (canalis incisivus) (varies in size and position and may be absent)
9. Interdental alveolar septum (septa interalveolaria)
10. Interincisive suture (sutura interincisiva)
11. Nasal process of the incisive bone (processus nasalis, os incisivum)
12. Vomer

DuPont, Gregg A.; DuPont, Gregg A.; DeBowes, Linda J.; DeBowes, Linda J.. Atlas of Dental Radiography in Dogs and Cats - E-Book (p. 9). Elsevier Health Sciences. Kindle Edition.