The Development of the Vertebral Column

ISBN-13: 9783540137306 / Angielski / Miękka / 1984 / 124 str.

Abraham J. Verbout

Opis

3. 11 Stage XI (ca. 10. 5-12. 5 mm) 48 3. 11. 1 Axial Relations 48 3. 11. 2 Lateral Relations 49 3. 11. 3 Summary . . . . 52 3. 12 Stage XII (ca. 13-16 mm) 53 3. 12. 1 Axial Relations 53 3. 12. 2 Lateral Relations 56 3. 12. 3 Summary 59 4 Discussion . . . . . 60 4. 1 Introduction 60 4. 2 Early Differentiation of the Somite Mesoderm 60 4. 2. 1 Dermatome . . . . 60 4. 2. 2 Myotome . . . . . . . . . . 61 4. 2. 3 Somitic Mesenchyme . . . . . 61 4. 3 Development of the Axial Mesenchyme 63 4. 4 Development of the Somitic Mesenchyme 66 4. 4. 1 Segmentation Process in the Somitic Mesenchyme 66 4. 4. 2 Differentiation of the Somitic Mesenchyme into the Mesenchymatous Primordium of the Axial Skeleton 70 4. 4. 2. 1 Metameric Condensations: Arcual and Costal Processes 70 4. 4. 2. 2 Axial Somitic Mesenchyme (Transverse Commissure) 73 4. 4. 2. 3 Perichordal Tube . . . . . . . . . . . . . . 74 4. 4. 2. 4 Linkage Between Lateral and Axial Segmentation 78 4. 4. 2. 5 Origin of the Mesenchymal Vertebral Bodies . . . 81 4. 4. 2. 6 Blastema of Vertebral Processes and its Relationship with the Blastemic Vertebral Body . . . . . . . . . . . . 83 4. 4. 3 Differentiation of the Somitic Mesenchyme in Relation to the Development of the Peripheral Spinal Nervous System 85 4. 5 Differentiation into Cartilaginous Axial Skeleton . . . . . . 89 . 4. 6 Differentiation of Myotomes; Morphology of the Developing Myotome . . . . . . . . . . . . . . . . . . . . . . . . 92 4. 7 The Notochord . . . . . . . . . . . . . . . . . . . . . 94 Some Remarks on the "Neugliederung" Concept with Special At- 4.

Spis treści

1 Introduction and Review of the Literature.- 2 Material and Methods.- 3 Findings.- 3.1 Stage I (ca. 3 mm).- 3.1.1 Summary.- 3.2 Stage II (ca. 3.5 mm).- 3.2.1 Axial Relations.- 3.2.2 Lateral Relations.- 3.2.3 Summary.- 3.3 Stage III (ca. 4 mm).- 3.3.1 Axial Relations.- 3.3.2 Lateral Relations.- 3.3.3 Summary.- 3.4 Stage IV (ca. 4.5 mm).- 3.4.1 Axial Relations.- 3.4.2 Lateral Relations.- 3.4.3 Summary.- 3.5 Stage V (ca. 5 mm).- 3.5.1 Axial Relations.- 3.5.2 Lateral Relations.- 3.5.3 Summary.- 3.6 Stage VI (ca. 5.5 mm).- 3.6.1 Axial Relations.- 3.6.2 Lateral Relations.- 3.6.3 Summary.- 3.7 Stage VII (ca. 6 mm).- 3.7.1 Axial Relations.- 3.7.2 Lateral Relations.- 3.7.3 Summary.- 3.8 Stage VIII (ca. 6.5–7 mm).- 3.8.1 Axial Relations.- 3.8.2 Lateral Relations.- 3.8.3 Summary.- 3.9 Stage IX (ca. 7.5–8.5 mm).- 3.9.1 Axial Relations.- 3.9.2 Lateral Relations.- 3.9.3 Summary.- 3.10 Stage X (ca. 9–10 mm).- 3.10.1 Axial Relations.- 3.10.2 Lateral Relations.- 3.10.3 Summary.- 3.11 Stage XI (ca. 10.5–12.5 mm).- 3.11.1 Axial Relations.- 3.11.2 Lateral Relations.- 3.11.3 Summary.- 3.12 Stage XII (ca. 13–16 mm).- 3.12.1 Axial Relations.- 3.12.2 Lateral Relations.- 3.12.3 Summary.- 4 Discussion.- 4.1 Introduction.- 4.2 Early Differentiation of the Somite Mesoderm.- 4.2.1 Dermatome.- 4.2.2 Myotome.- 4.2.3 Somitic Mesenchyme.- 4.3 Development of the Axial Mesenchyme.- 4.4 Development of the Somitic Mesenchyme.- 4.4.1 Segmentation Process in the Somitic Mesenchyme.- 4.4.2 Differentiation of the Somitic Mesenchyme into the Mesenchymatous Primordium of the Axial Skeleton.- 4.4.2.1 Metameric Condensations: Arcual and Costal Processes.- 4.4.2.2 Axial Somitic Mesenchyme (Transverse Commissure).- 4.4.2.3 Perichordal Tube.- 4.4.2.4 Linkage Between Lateral and Axial Segmentation.- 4.4.2.5 Origin of the Mesenchymal Vertebral Bodies.- 4.4.2.6 Blastema of Vertebral Processes and its Relationship with the Blastemic Vertebral Body.- 4.4.3 Differentiation of the Somitic Mesenchyme in Relation to the Development of the Peripheral Spinal Nervous System.- 4.5 Differentiation into Cartilaginous Axial Skeleton.- 4.6 Differentiation of Myotomes; Morphology of the Developing Myotome.- 4.7 The Notochord.- 4.8 Some Remarks on the “Neugliederung” Concept with Special Attention to Autotomy.- 5 Summary and Conclusions.- References.- Author Index.