intraoral anatomy mandibular

Question 1

in infants, it is radiolucent line through the midline of the jaw between the images of the forming deciduous central incisors

Answer 1

symphysis
(adults shouldn’t see separation)

Question 2

they are bony protuberances located on the lingual surface of the mandible slightly above the inferior border and in the midline

Answer 2

genial tubercles

Question 3

foramen on lingual surface of midline of mandible in the region of the genial tubercles

often 2 or even more

Answer 3

lingual foramen

Question 4

on periapical radiographs of mandibular central incisors, this may occasionally be seen as two radiopaque lines sweeping bilaterally forward and upward toward the midline

Answer 4

mental ridge

Question 5

mental fossa is a depression on the labial aspect of the mandible extending laterally from the midline and above the mental ridge
-seen as radiolucent area ill-defined borders in the region of incisor roots

Answer 5

mental fossa

(makes bone very thin)
(can appear somewhat radiolucent if very thin)

Question 6

usually the anterior limit of the inferior dental canal

Answer 6

metnal foramen

Question 7

radiographic image of the mandibular canal is a dark linear shadow with thin radiopaque superior and inferior borders

Answer 7

mandibular canal

Question 8

top border of mandibular canal:

bottom border of mandibular canal:

Answer 8

superior cortex (cortical border)

inferior cortex (cortical border)

Question 9

carry a neurovascular bundle and appear as radiolucent lines of fairly uniform width

Answer 9

nutrient canals

(everywhere in mand)
(see a lot of them with periodontal disease)

Question 10

radiopaque cortical borders, descend from mand first molar

seen as vertical radiolucent structures

Answer 10

nutrients canals

Question 11

slightly irregular crest of bone on the lingual surface of the mand body

Answer 11

internal oblique ridge aka mylohyoid ridge

Question 12

this runs at the level of the molar apices and above the mandibular canal

Answer 12

mylohyoid ridge

Question 13

depression of the bone on the lingual surface of the mandibular body, immediately below the internal oblique ridge in the molar area

Answer 13

submandibular gland fossa

Question 14

radiolucent region with ill-defined borders and sparse trabecular bone lying inferiorly to the mandibular molars

Answer 14

submandibular gland fossa

Question 15

continuation of the anterior border of the mandibular ramus

Answer 15

external oblique ridge

Question 16

seen as a radiopaque line near the alveolar crest in the mandibular third molar region

Answer 16

external oblique ridge

Question 17

seen on periapical projections as a characteristically dense, broad radiopaque band of bone

Answer 17

inferior border of the mandible

Question 18

triangular radiopacity, with its apex directed superiorly and anteriorly, superimposed on the region of the third molar

Answer 18

coronoid process

(seen in maxillary xrays)

Question 19

bony outgrowths on the lingual surface of the mandible
-often bilateral and symmetrical

Answer 19

mandibular tori