Lecture 13: Development of Orofacial Structures Flashcards Preview

Year 1: 05. Neuro Exam 1 > Lecture 13: Development of Orofacial Structures > Flashcards

Flashcards in Lecture 13: Development of Orofacial Structures Deck (46)
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1

What does the viscerocranium become?

What is its embryological origin?

Facial skeleton

Mesenchyme

2

What does the neurocranium become?

What is its embryological origin?

Bones that enclose the brain

Mesenchyme

3

What bones form from the cartilagenous neurocranium?

  1. Occipital Bone
  2. Body of Sphenoid Bone
  3. Ethmoid Bone
  4. Petrous and mastoid parts of Temporal Bone

 

4

What bones arise from the membranous neurocranium?

Frontal and Parietal Bones

5

What bone initially begins as part of the viscerocranium and then migrates to become part of neurocranium?

Frontal Bone

6

Male newborn patient presents with a long, narrow, wedge-shaped head.

What is the most likely diagnosis? This most likely results from premature closure of what suture?

Scaphocephaly

Sagittal suture

7

Male infant that has a high, tower-like head may have what disorder? From premature closure of what suture?

Brachycephaly

Coronal suture

8

An infant presenting with a twisted, asymmetric head may have what disorder? Due to premature closure of what suture?

Plagiocephaly

Coronal suture

9

A premature closure of the frontal (metopic) suture may result in what disorder? What bones does this affect?

Trigonocephaly

Frontal and Orbital bones

10

What is the facial primordia?

What makes up the facial primordia?

Tissue that surrounds stromodeum (primitive mouth) 

  • 2 Maxillary Prominences
  • 2 Mandibular Prominences
  • 1 Frontonasal Prominence 

11

What separates the the facial primordia from the pharyngeal pharynx?

Oropharyngeal Membane 

12

In what weeks does facial development occur?

Weeks 4-8

13

How does the mandibular prominece fold?

What can incomplete fusion result in?

  1. Oropharyngeal membrane disintegrates 
  2. Medial ends of both prominences merge 

 

Incomplete fusion can lead to chin dimple 

14

What does the maxillary prominences give rise to?

 

Upper Lip

Maxilla

Secondary Palate

15

What pharyngeal arch do the muscles of facial expression come from?

What do they invade into?

2nd Pharyngeal Arch

Invade primordial lips and cheeks to give facial expression muscles

16

What does the frontonasal prominence give rise to?

Forehead

Caudal boundary of stomodeum and nose 

17

At the end of the 4th week, what forms on the inferolateral parts of the frontal nasal prominence?

Nasal placodes

18

What is the direct embryonic origin of the philtrum?

Fusion of Median Nasal Prominence

 

19

What seapartes lateral nasal prominence from maxillary prominence?

When do they fuse?

Nasolacrimal Groove

Fuses by Week 6

20

How does the auricle develop?

Six hillocks surround Pharyngeal Arch 1 and is pushed from the neck to side of the head when the mandible develops

21

What pharyngeal arch do the muscles of mastication arise from?

1st Pharyngeal Arch

22

How do nasal cavities form?

  1. Nasal Placodes (thickened ectoderm) depress and form nasal pits (eventual nostrils)
  2. Primitve oronasal membrane is formed and disintegrates giving nasal sacs

23

What are some of the nasal cavity derivatives?

Nasal Choncahe: Superior, Middle, and Inferior

Olfactory Epithelium 

24

What is the critical period for palatogenesis?

Weeks 6-9 (finishes development at 12)

25

What gives rise to the intermaxillary segment?

Medial Nasal Prominence

26

What part of the palate does the intermaxillary segment give rise to?

Primary palate

Fusion of median nasal prominences 

27

What is the embryonic origin of the secondary palate?

Lateral palatine processes (shelves) from the maxillary prominences

28

What is the incsive fossa a remnant of?

Nasopalatine Canal

29

How does the nasal septum form?

  1. Downward growth of merged medial nasal prominences
  2. Fuses with lateral palatine processes (from maxillary)

30

What embryonic structures failed to fuse in cleft lip?

Maxillary prominences and median nasal prominences