Embryology, etc. Flashcards Preview

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Flashcards in Embryology, etc. Deck (87)
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30

Slight enlargement of ectodermal and endodermal cells at the cranial end?

Prochordal plate

31

Differentiation of 3 germ layers from which all tissues and organs develop?

Gastrulation

32

Mesoderm arise from what cells?

Mesenchymal cells of the epiblast

33

Mesoderm develops in ____ week?

3rd week

34

Embryonic origin of enamel?

Ectoderm

35

Embryonic origin of the teeth except for enamel?

Mesoderm

36

Mesenchymal cells arising from the primitive node which extends cranially to the prochordal plate?

Notochord

37

Functions of the notochord? (2)

  • Patterning
  • Structural support

38

It acts as the main axial skeletal element of the early embryo.

Notochord

39

Process of formation of neural plate and neural tube at the end of 3rd week?

Neurulation

40

Thickening of the ectoderm cranial to the primitive node?

Neural plate

41

Primordium of the CNS?

Neural tube

42

Cells found between the neural tube and ectoderm?

Neural crest cells

43

It makes up most of the connective tissues of the head?

Neural crest cells

44

Occurs when there is problem with migration of the neural crest cells?

Treacher Collins Syndrome

45

Symptoms of treacher collins syndrome? (4)

  • Downward slanting eyes
  • Small lower jaw
  • Malformed or absent ears
  • Prominent nose

46

Masses of mesoderm that lie on either side of the neural tube?

Somites

47

Primary brain vesicles? (3)

  • Prosencephalon
  • Mesencephalon
  • Rhombencephalon

48

Folding of the embryo starts in the _____ week?

4th week

49

Primitive mouth of the embryo?

Stomodeum

50

Combined ectoderm and endoderm with no intervening mesoderm?

Bucco/oropharyngeal membrane

51

It temporarily separates the stomodeum from the foregut?

Buccopharyngeal membrane

52

Invagination of the stomodeal ectoderm which develops to form the anterior lobe of the hypophysis?

Rathke's pouch

53

1st pharyngeal arch is also called?

Mandibular arch

54

Arch forming the facial muscles, vessels and hyoid bone?

2nd pharyngeal arch or hyoid arch

55

It become the future external acoustic meatus?

1st branchial/pharyngeal cleft

56

Structures that develop from the 1st pharyngeal pouch? (3)

  • Middle ear
  • Eardrum
  • Eustachian tube

57

Structure that develop from the 2nd pharyngeal pouch?

Palatine tonsils

58

Structures that develop from the 3rd pharyngeal pouch? (2)

  • Inferior parathyroid gland
  • Thymus gland

59

Structure that develop from the 4th pharyngeal pouch?

Superior parathyroid gland