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Flashcards in Pharyngeal Arches Deck (39)
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1

most congenital anomalies in head and neck originate during transformation of the pharyngeal apparatus into its adult derivatives

pharyngeal arches

2

pharyngeal arches develop in the _____ (#) week as ____________ that migrate into the future head and neck regions

4th week, neural crest cells

3

Appear as surface elevations to the developing pharynx

primordium of the jaws (the first pair of pharyngeal arches)

4

by the end of the 4th week, how many well-defined pairs of pharyngeal arches are visible externally

four

5

rudimentary and not visible on the surface of the embryo

5th and 6th arches

6

arches are separated from each other by prominent fissures called

pharyngeal grooves (clefts)

7

the first pharyngeal arch (mandibular arch) develops into two prominences:

maxillary and mandibular prominences

8

gives rise to the maxilla, zygomatic bone, ad squamous part of the temporal bone

maxillary prominence of the first pharyngeal arch

9

forms the mandible

mandibular prominence of the 1st pharyngeal arch

10

makes a major contribution to the formation of the hyoid bone

second pharyngeal arch (hyoid arch)

11

appears as a slight depression of the surface ectoderm, its separated by the oropharyngeal membrane

stomodeum (primordial mouth)

12

the stomodeum is separated from the cavity of the primordial pharynx by a bilaminar membrane

oropharyngeal membrane

13

ruptures at 26 days, bringing the primordial pharynx and foregut into communication with the external environment

oropharyngeal membrane

14

Initially, each pharyngeal arch consists of a core of ________ and is covered externally by _______ and internally by ________

mesenchyme (embryonic CT), ectoderm, endoderm

15

the original mesenchyme is derived from mesoderm in what week

third week

16

during the 4th week, most of the mesenchyme is derived from __________ that migrate into the pharyngeal arches

neural crest cells

17

a typical pharyngeal arch contains:

aortic arch, cartilaginous rod, muscular component, and a nerve

18

an artery that arise from the truncus arteriosus of the primordial heart

aortic arch

19

forms the skeleton of the arch

cartilaginous rod

20

forms muscles in the head and neck

muscular component of pharyngeal arches

21

supplies the mucosa and muscles derived from the arch

nerve of pharyngeal arches

22

nerve deriving from the first arch (mandibular)

mandibular nerve/ V3 of trigeminal nerve (CN V)

23

muscles of the first arch (mandibular)

muscles of mastication, myohyoid and ant. belly of digastric, tensor tympani, and tensor veli palatini

24

skeletal structure of first arch

malleus and incus

25

ligaments deriving from the first arch (mandibular)

anterior ligament of malleus and sphenomandibular ligament

26

nerve deriving from the second arch (hyoid)

fascial nerve (CN VII)

27

muscles deriving from the second arch (hyoid)

muscles of fascial expressions, stapedius m., stylohyoid m., post. belly of digastric

28

skeletal structures deriving from the second arch (hyoid)

stapes, styloid process, lesser horn and upper part of body of hyoid bone

29

ligaments deriving from second arch (hyoid)

stylohyoid ligament

30

nerve deriving from the 3rd arch

glossopharyngeal (CN IX)