PPT 5: Embryological Development Flashcards Preview

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Flashcards in PPT 5: Embryological Development Deck (18)
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Neurocranium (Vault, Cranial Base) or Viscerocranium?
A. Nasal, Mandible bones
B. Hyoid, middle ear bones
C. Ethmoid, petrous temporal bones
D. Parietal, frontal bones

A. Viscero
B. Viscero
C. Neuro - cranial base
D. Neuro - vault


Endochondrial or Intramembranous ossification?
A. Vault bones
B. Cranial base bones
C. Cartilaginous bones: ossicles, hyoid
D. Face bones

A. Intramembranous
B. Endochondrial
C. Endochondrial
D. Intramembranous


Longitudinal or lateral growth?
A. Spheno-occipital joint
B. Temporal and sphenoid bones
C. Ends in mid teens
E. Involves synchodrosis joint

A. Longitudinal growth
B. Lateral growth.
C. Longitudinal growth. S-E and S-O joints close.
D. Both


What is the cranial base angle and how does it affect the shape of the face?

Angle between occiput and sphenoid.
Large angle = overbite
Small angle = underbite


What types of cells converge in the pharyngeal arches? What types of tissues do these cells produce?

Mesenchyme and neural crest cells converge to form pharyngeal arches. These cells form bones, cartilage, skin, arteries, and nerves of the face.


Name the Pharyngeal Arch: 1 (mandibular), 2 (hyoid), 3, 4
A. Glossopharyngeal CN IX
B. Trigeminal CN V
C. Vagus CN X
D. Facial CN VII

A. 3
B. 1
C. 4
D. 2


Name the Pharyngeal Arch: 1 (mandibular), 2 (hyoid), 3, 4
A. Mandible, maxilla
B. Hyoid
C. Larynx
D. Styloid process

A. 1
B. 2 and 3
C. 4
D. 2


Name the Pharyngeal Arch: 1 (mandibular), 2 (hyoid), 3, 4
A. Stapes
B. Malleus, Incus
C. Zygoma
D. Squamous Temporal

A. 2
B. 1
C. 1
D. 1


What does the pharyngeal groove become? What does pouch 1 become?

Groove = External acoustic meatus (ear canal)
Pouch 1 = Tympanic cavity, Eustacian/auditory tube


Which pharyngeal pouch? 1, 2, 3, or 4?
A. Parathyroid and C cells of thyroid
B. Thymus and parathyroid
C. Palatine tonsil
D. Structures migrate down into neck from

A. 4
B. 3
C. 2
D. 3 and 4


Cleft lip is caused by incomplete or complete failure of fusion of _______.

Maxillary and medial nasal prominences


What two failures of fusion can result in a cleft palate?

(1) the palatine processes (shelves) fail to fuse at midline
(2) the fusion between primary and secondary palates does not occur


T or F? Skull bones and cartilage are formed from:
A. Neural crest cells
B. Local mesoderm somites
C. Lateral plate mesoderm
D. Outer epithelial layers

A, B, and D are true


T or F?
The eventual shape of the skull is determined by the development of the vault bones in relation to intermembranous growth centers.

False. It is determined by the soft tissues (brain, connective tissues, and muscles)


What is a synchodrosis joint?

It is a temporary form of joint where the cartilage is converted into bone before adult life (epiphyseal growth plate) (from Wikipedia)


Name the Pharyngeal Arch: 1 (mandibular), 2 (hyoid), 3, 4
A. Tensors tympani and palati m
B. Facial expression, posterior diagastric m
C. All facial development comes from this arch
D. Masticators, anterior diagastric m

A. 1
B. 2
C. 1
D. 1


Name the Pharyngeal Arch: 1 (mandibular), 2 (hyoid), 3, 4
A. Stapedius m
B. Muscles of pharynx and larynx
C. Stylohyoid m
D. Stylopharyngeus m

A. 2
B. 4
C. 2
D. 3


Thyroid descends from base of tongue through _______ and ________, anterior of hyoid bone and larynx.

Foramen cecum and thyroglossal duct