Lect. 23 - Skeletal system Development II Flashcards Preview

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Flashcards in Lect. 23 - Skeletal system Development II Deck (11)
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1
Q

Viscerocranium

A

(Refers to pharyngeal arches); surrounds oral cavity and pharynx; cartilagenous portion - forms pharyngeal arch I and II; membranous portion forms - temporal, zygomatic, maxillary, nasal, lacrimal, alanine, vomer, pterygoid plates, mandible, tympanic ring

2
Q

Components of the pharyngeal arches

A

Pharyngeal arch I: mechel’s cartilage, malleus, incus

Pharyngeal Arch II: Reichert’s cartilage, stapes, styloid

3
Q

What is the origin of the mesenchyme that forms the Viscerocranium?

A

Mostly from neural crest

4
Q

4 components of each pharyngeal arch?

A

Skeletal element, muscles, branch of specific cranial nerve, artery

5
Q

Basiooccipital portion of chondrocranium is derived from?

A

Parachordal cartilages and occipital sclerotomes

6
Q

What is the cause of the elongation of primary ossification centers?

A

Shh

7
Q

Fontanelle

A

Intersection of more than 2 bones

8
Q

Fusion of suture pathway

A

Noggin is expressed in all sutures; FGF-2 blocks Noggin; Noggin blocks BMP which leads to closure of sutures

9
Q

What results in the neurocranium arising?

A

Inductive interactions of surrounding mesenchyme - characterized by transient appearance of type II collagen and cartilage-specific proteoglycan

10
Q

Neurocranium

A

Part of the skull that surrounds the brain; has cartilaginous portion and membranous portion; base formed from chondrocranium - origin of occipital, sphenoid, ethmoid, and parts of temporal; membranous part - origin of occipital, parietal so, frontals, part of temporals

11
Q

Membranous portion of the viscerocranium forms what?

A

Part of temporal, zygomatic, maxillary, nasal, lacrimal, alanine, vomer, pterygoid plates, mandible, tympanic ring