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AN79.1 - Describe the development of somites and intra-embryonic coelom
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Somites develop primarily from which part of intra-embryonic mesoderm?
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Paraxial mesoderm
Intermediate mesoderm
Lateral plate mesoderm
Axial mesoderm
Somites are located on either side of the:
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Notochord and neural tube
Yolk sac
Amniotic cavity
Primitive streak only
Somites begin to appear at approximately:
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Day 10
Day 14
Day 20
Day 35
Somites develop progressively in which direction?
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Caudocranial
Craniocaudal
Lateral to medial
Medial to lateral
The three major components of a typical somite are:
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Sclerotome, myotome and dermatome
Endoderm, mesoderm and ectoderm
Neural tube, neural crest and notochord
Somatopleure, splanchnopleure and coelom
The sclerotome of a somite primarily contributes to the:
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Vertebrae and ribs
Skeletal muscles
Dermis
Peripheral nerves
The myotome of a somite primarily gives rise to:
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Skeletal muscle
Vertebral bodies
Dermis
Peritoneum
The dermatome of a somite mainly contributes to the:
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Dermis of the skin
Vertebral column
Skeletal muscles
Pleural cavity
Which somite component surrounds the notochord and neural tube during vertebral development?
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Sclerotome
Myotome
Dermatome
Lateral plate
The nucleus pulposus of the intervertebral disc is derived from the:
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Notochord
Sclerotome
Myotome
Dermatome
The intra-embryonic coelom develops within the:
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Lateral plate mesoderm
Paraxial mesoderm
Intermediate mesoderm
Notochord
The intra-embryonic coelom is formed initially by:
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Fusion of small spaces within lateral plate mesoderm
Fusion of somites
Splitting of the neural tube
Degeneration of the notochord
Formation of the intra-embryonic coelom divides the lateral plate mesoderm into:
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Somatic and splanchnic mesoderm
Paraxial and intermediate mesoderm
Ectoderm and endoderm
Sclerotome and myotome
The somatic mesoderm lies adjacent to the:
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Ectoderm
Endoderm
Notochord
Neural tube
The splanchnic mesoderm lies adjacent to the:
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Endoderm
Ectoderm
Neural tube
Surface of the amnion
Somatic mesoderm together with ectoderm forms the:
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Somatopleure
Splanchnopleure
Neural crest
Sclerotome
Splanchnic mesoderm together with endoderm forms the:
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Splanchnopleure
Somatopleure
Dermatome
Neural tube
The intra-embryonic coelom initially has approximately which shape?
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Horseshoe-shaped
Circular
Straight cylindrical
Triangular
The cranial transverse portion of the intra-embryonic coelom contributes mainly to the:
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Pericardial cavity
Peritoneal cavity
Vertebral canal
Neural canal
The intra-embryonic coelom ultimately contributes to which three major body cavities?
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Pericardial, pleural and peritoneal cavities
Cranial, vertebral and pelvic cavities
Oral, nasal and thoracic cavities
Amniotic, chorionic and yolk-sac cavities
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