embryo 2

Question 1

components of the Pharyngeal app. give rise to structures of the:

Answer 1

face, mouth, pharynx, larynx, and neck

Question 2

origin of the mesenchyme of the face and pharynx:

Answer 2

• neural crest cells
• paraxial mesoderm (striated muscle, dermis, endothelium of BVs, vertebrae)
• paraxial mesoderm of occipital somites to the tongue

Question 3

at the end of week 4, there are ____ pairs of pharyngeal arches visible

Answer 3

four

Question 4

where pouches and clefts come together with little or no mesoderm between them

Answer 4

membranes

Question 5

pharynx derived structures include:

Answer 5

face, palate, tongue, thyroid gland, pharynx, larynx, and external/middle ear components

Question 6

each arch has an ____, ____, ___, and ____ component

Answer 6

nerve; artery; cartilage; muscle

Question 7

mandibular process (from 1st arch) contains ____; dorsal portions of this break off to form ____ and ____

Answer 7

Meckel’s cartilage; malleus; incus

Question 8

perichondrium from the middle portion of meckel’s cartilage persists as:

Answer 8

sphenomandibular ligament and anterior ligament of malleus

Question 9

mm derived from 1st pharyngeal arch

Answer 9

• mm of mastication (masseter, temporalis, medial/lateral pterygoids)
• mylohyoid m.
• anterior belly of digastric
• tensor tympani/tensor veli palatini mm.

Question 10

2nd arch mm

Answer 10

• mm of facial expression
• post belly of digastric
• stapedius m.
• stylohyoid m.