Lecture 6: Embryology of Pharyngeal Apparatus Flashcards Preview

Year 1: 05. Neuro Exam 1 > Lecture 6: Embryology of Pharyngeal Apparatus > Flashcards

Flashcards in Lecture 6: Embryology of Pharyngeal Apparatus Deck (54)
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1

What does a pharyngeal apparatus consist of?

  • Pharyngeal Arches
  • Pharyngeal Pouches (internal structure - endoderm)
  • Pharyngeal Grooves/Clefts (ectoderm) 

2

What is the embryological origin of phayngreal arches?

Neural Crest Cells

3

What pharyngeal arch do the primordial jaws arise from?

1st Pharyngeal Arch

Neural Crest Cell 

4

What germ layer(s) contribue to the core of a pharyngeal arch?

What germ layer(s) externally cover the pharyngeal arch?

Core: Mesoderm and Mesenchyme (migratory NCC)
Cover: Ectoderm and Endoderm

5

What is the function of pharyngeal arches?

  1. Support lateral walls of primordial pharynx 
  2. Give rise to prominences of tissue that contribue to craniofacial development

6

What germ layer plays an essential role in regulation the development of arches?

Pharyngeal Endoderm

7

What germ layer gives rise to facial muscles?

Paraxial Mesoderm 

8

What germ layer gives rise to endothelium?

Lateral Plate Mesoderm 

9

What germ layer gives rise to extraocular muscles?

Prechordal Plate Mesoderm 

10

What structures will a typical pharyngeal arch contain?

  • Cartilagenous Rod: skeletal elements
  • Muscular Component: Paraxial and Prechordal derived
  • Cranial Nerves: sensory and/or motor components
  • Artery: from truncus arteriosus

11

What pharyngeal arch does Meckel's cartilage arise from?

Pharyngeal Arch 1

12

What does the dorsal part of Meckel's cartilage form?

What germ layer do these structures arise from?

Malleus and Incus bones

Neural Crest Cells

13

What does the perichondrium of Meckel's cartilage form?

Anterior ligament of Malleus bone

Sphenomandibular Ligament

14

What does the ventral side of Meckel's cartilage give rise to?

Primordium of mandible (transient structure)

Proper mandible will form laterally to it while Meckel's cartilage disintegrates

15

What is the cartilage of Pharyngeal Arch 2?

Riechert's cartilage

16

What does the dorsal part of Riechert's cartilage form?

Stapes

Styloid Process of the Temporal Bone

17

What arises from the ventral end of Riechert's cartilage?

Lesser cornu/horn of Hyoid bone

18

What arises from the perichondrium of the Riechert's cartilage?

Stylohyoid L.

19

What does the 3rd Pharnygeal cartilage give rise to?

Greater horn/cornu of hyoid bone

 

20

What does the hypopharyngeal eminence give rise to?

What PAs does it arise from?

Body of hyoid bone

Arises from Pharyngeal Arches 3 and 4: floor of embryonic pharanyx 

21

What pharyngeal arches do the laryngeal cartilages come from?

Pharyngeal Arches 4 and 6 

22

What pharyngeal arches do the epiglottis come from?

Pharyngeal Arch 4

23

Where does the aoritc arch system arise from?

Aortic Sac

24

What muscles does the 1st pharyngeal arch give rise to?

What is it innervated by?

Muscles of Mastication (4)

Cranial Nerve V3

25

What muscles do the 2nd pharygneal arch give rise to?

What is it innervated by?

  • Stapedius 
  • Muscles of Facial Expression

Cranial Nerve VII 

26

What muscle does the 3rd Pharyngeal Arch give rise to?

What is it innervated by?

Stylopharyngeus Muscle

Cranial Nerve IX 

27

What muscles do the 4th pharygneal arch give rise to?

What is it innervated by?

  • Cricothyroid M.
  • Levator veli palatini M.
  • Pharyngeal constrictor ms.

Cranial Nerve X 

28

What muscles do the 6th pharygneal arch give rise to?

What is it innervated by?

Intrinsic Muscles of Larynx 

Cranial Nerve X

29

What is the embryological origin of the External Acoustic Meatus?

1st Pharyngeal Groove

Ectoderm

30

What grooves lie in the cervical sinus?

Grooves 2-4