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ANAT UNIT 1 FINAL

SEGMENTAL DEVELOPMENT (OF THE SPINE & SPINAL CORD)

QuestionAnswer
During gastruation the mesoderm becomes further differentiated into these three layers: PARAXIAM MESODERM, INTERMEDIATE MESODERM, AND LATERAL PLATE MESODERM
Around Day 20, the paraxial mesoderm begins to be organized into segments called: SOMITES
Each somite becomes organized into two separate segments. The segment located ventromedially is called a: SCLEROTOME
Each somite becomes organized into two separate segments. The segment located dorsolaterally is called a: DERMOMYOTOME
The sclerotome will form the bones of the: AXIAL SKELETON
The dermomyotome will form: SKIN AND MUSCLES
The axial skeleton is formed from these cells of the scelertome: MESENCHYMAL
Once the sclerotomes fuse in the midline they split into cranial and caudal portions and then begin a process of resegmentation. How does this happen? THE CAUDAL HALF OF ONE SCLEROTOME FUSES WITH THE CRANIAL HALF OF THE NEXT MOST CAUDAL SCLEROTOME
Failure of the vertebral arch to fuse properly is called: SPINA BIFIDA OCCULTA
Separation of the neural arch from the body is called: SPONDYLOLISTHESIS
Each dermomyotome portion of a somite differentiates into this medial part: MYOTOME
Each dermomyotome portion of a somite differentiates into this lateral part: DERMOTOME
The myotome divides into these two partes: EPIMERE AND HYPOMERE
Muscles develop from the myotome or the dermomyotome? MYOTOME
The deep back muscles develop from the epimere or the hypomere of the myotome? EPIMERE
The lateral and anterior trunk muscles develop from the epimere or the hypomere? HYOPMERE
What two signaling molecules are active in establishing the boundaries between adjacent somites? RETINOIC ACID AND FIBROBLAST GROWTH FACTOR
The notochord and ventral neural tube express these two signaling molecules that cause the ventromedial part of the somite to form the sclerotome: SONIC HEDGEHOG AND NOGGIN
The dermomyotome will differentiate into three portions: dorsomedial, middle, and ventrolateral. The dorsomedial portion will become: EXPAXIAL MUSCLES
The dermomyotome will differentiate into three portions: dorsomedial, middle, and ventrolateral. The middle portion will become: DERMIS OF THE BACK AND TRUNK
The dermomyotome will differentiate into three portions: dorsomedial, middle, and ventrolateral. The ventrolateral portion will become: HYPAXIAL (BODY WALL) AND LIMB MUSCLES
Failure of the neural arch to form that captures some of the meninges surrounding the spinal cord is a: SPINA BIFIDA MENINGOCELE
Created by: AnatomyByDocRoxy
 

 



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