Osteology exam 2 Flashcards Preview

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Flashcards in Osteology exam 2 Deck (93)
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1

Mandible body (corpus or horizontal ramus)

Thick bony part that anchors teeth

2

Mental foramen

On lateral corpus surface. Transmits mental vessels and nerve.

3

Oblique line

Weak eminence that passes from root of ramus to area at rear of mental foramen.

4

Extramotor sulcus

Gutter between root of anterior edge of ramus and lateral alveolar margin of last molar. Gives rise to buccinator muscle of cheek.

5

Mylohyoid line

Crosses medial surface of corpus, begining near alveolar margin at last molar position and diminishing as it runs anteroinferiorly. Attachment site for mylohyoid muscle which elevates tongue.

6

Submandibular fossa

Hollow beneath alveolar portion that runs along medial corpus. Inferior to mylohyoid line. Submandibular gland rests here.

7

Sublingual fossa

Hollowing beneath alveolar region, superior to mylohyoid line in premolar region. Sublingual gland rests here.

8

Mandibular torus

Variably developed thickening of alveolar margin.

9

Mandibular symphisis

Midline surfaces of unfused halves.

10

Mental spines

Lie near inferior margin of inner surface of anterior corpus. Anchor genioglossal and geniohyoid muscles.

11

Digastric fossae

Pair of roughened depressions on posteroinferior aspect of corpus adjacent to midline. Attachment sites for digastric muscles.

12

Mental protuberance (eminence)

Bony chin at base of corpus. Separated from alveolar margins of incisors by pronounced incurvation.

13

Ramus

Thinner than corpus. Articulates with cranial base.

14

Mandibular condyle

On posterosuperior corner of ramus. Articulates with TMJ.

15

Condylar neck

Justt anteroinferior to condyle. Head of lateral pterygoid muscle attaches to anteromedial surface of neck just below articular surface of confdyle in pterygoid fovea.

16

Coronoid processes

Thin and triangular. Recieve insertion of temporalis muscle.

17

Mandibular notch (incursura)

Notch between condyle and coronoid process.

18

Angle (gonial angle)

Rounded posteroinferior corner of mandible.

19

Masseteric tuberosity

Raised, roughened area at lateral edge of gonial angle where masseter muscle attaches.

20

Masseteric fossa

Hollowing on lateral surface of gonial angle.

21

Endocoronoid ridge (buttress)

Vertical ridge extending inferiorly from coronoid tip on inner (medial) aspect of ramus.

22

Mandibular foramen

Enters bone obliquely, centred in medial surface of ramus. Alveolar vessels and inferior alveolar nerve enter bone here.

23

Lingula

Sharp projection at edge of mandibular foramen. Attachment point for sphenomandibular ligament.

24

Mylohyoid groove

Crosses medial surface of ramus, running anteroinferiorly from edge of mandibular foramen. Lodges mylohyoid vessels and nerve.

25

Pterygoid tuberosities

Interrupt medial surface of gonial angle posteroinferior to mylohyoid groove. Mark insertion of medial pterygoid muscle, an elevator of the mandible.

26

Body of sphenoid

Midline. Most substantial part. Anterior surface forms superoposterior wall of nasal cavity and articulates with cribriform plate and perpendicular plate of ethmoid. Posteriorly articulates with occipital at sphenooccipital suture. Anteroinferiorly articulates with vomer.

27

Optic canals

Either side of body of sphenoid. Optic never and opthalmic artery pass through.

28

Sella turcica

Saddle-shaped depression on endocranial surface of sphenoid. Located endocranially,posterior and inferior to optic canals.

29

Hypophyseal (pituitary) fossa

Deepest depression of sella. Hold pituitary gland.

30

Dorsum sellae

Square plate of bone that forms posterior boundary of sella turcica.