Manual of Human Embryology II - Figures

Figures

XIV. The Development of the Nervous System

I. Histogenesis of Nervous Tissue

I. Histogenesis of Nervous Tissue

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  Fig. 1. Three early stages in the development of the wall of the neural tube,

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  Fig. 2. Wall of the neurfl tube in a human embryo about two weeks old, showing its syncytial character.

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  Fig. 3. Diagram showing the differentiation of the cells of the wall of the neural tube

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  Fig. 4. Development of neuroglia framework.

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  Fig. 5. Combined drawings, after Golgi and Benda methods, of the spinal cord of fetal pig, 20 cm. long

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  Fig. 6. Section of spinal cord of suckling pig of two weeks

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  Fig. 7. Neuroglia fibres in adult human spinal cord, showing their relation to 'the protoplasm of the neuroglia cell and its processes.

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  Fig. 8. Diagram showing distribution of neuroblasts in human embryo of four weeks.

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  Fig. 9. Cluster of neuroblasts from nucleus of origin of n. oculomotorius, showing characteristic shape and grouping of cells.

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  Fig. 10. Section through floor of mid-brain of human embryo one month old.

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  Fig. 11. Isolated ganglion-cells, from embryonic spinal cord of frog, and growing in clotted lymph.

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  Fig. 12. Three views, taken at intervals of Ik and 8i hours, of the same living nerve-fibres growing from a mass of spinal-cord tissue (frog embryo) out into clotted lymph.

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  Fig. 13. Transverse .sections through dorsal region of human embryos showing three stages in the development of the ganglion crest and the anlage of the spinal ganglia.

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  Fig. 14. Section through spinal ganglion of human embryo 18 mm. long, about 6 weeks old .

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  Fig. 15. Section through cervical spinal ganglion of human fetus 8.5 cm. long, about 3 months old, showing large ganglion-cells with eccentric nuclei.

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  Fig. 16. Section through sixth cervical ganglion of human fetus 10.5 cm. long, about 4 months old.

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  Fig. 17. Isolated cells teased from spinal ganglia of embryo pigs 20-40 mm. long, showing the variation in the form of the early ganglion-cells

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  Fig. 18. Teased preparations from spinal ganglia of pig, showing development of sheath and capsule cells.

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  Fig. 19. Isolated fibres showing development of medullary sheath.

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  Fig. 20. Isolated fibres of the sciatic nerve of sheep fetus 15 cm. long, treated with osmic acid and showing development of the nerve-sheath.

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  Fig. 21. Section through hind-brain of new-born child, showing myelinization of fifth, sixth, seventh, and eighth cranial nerves and associated fibre tracts

II. Development of the Central Nervous System

II. Development of the Central Nervous System

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  Fig. 30. Profile views of the brains of human embryos as seen during the third (A), fourth (B), and eighth (C) weeks

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  Fig. 32. Reconstruction showing the cranial nerves in a 10 mm human embryo

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  Fig. 44. Reconstruction showing cephalic portion of the rhombencephalon and adjoining midbrain at end of second month (human embryo 30 mm long (Mall collection. No. 86).

XVII. The Development of the Digestive Tract and of the Organs of Respiration

XVII. The Development of the Digestive Tract and of the Organs of Respiration

The Early Development of the Entodermal Tract and the Formation of its Subdivisions

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The Development of the Pharynx and of the Organs of Respiration

The Development of the Pharynx and of the Organs of Respiration

I. General Morphology of the Pharyngeal Pouches

I. General Morphology of the Pharyngeal Pouches

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  Fig. 314. Pharynx of the embryo Klb (Kromer-Pfannenstiel ; Normentafel, No. 3; 5-6 primitive segments, length, determined from the number of sections, 1.38 mm.)

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  Fig. 315. Pharynx of the embryo Rob. Meyer No. 335 (9-10 pairs of primitive segments, length, determined from the number of sections, 1.70 mm.)

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  Fig. 316. Pharynx of the embryo Hah in the collection of the First Anatomical Institute, Vienna (about 15 pairs of primitive segments, length about 3 mm.)

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  Fig. 317. Pharynx of the embryo Rob. Meyer No. 300 (Normentafel Xo. 7, 23 pairs of primitive segments, 2.5 mm. vertex-breech length) seen from the ventral surface.

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  Fig. 318.The model shown in Fig. 317 from the lateral surface.

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  Fig. 319. Pharyngeal pouches of the embryo Hah of the First Anatomical Institute, Vienna (5.2 mm., about the same stage as No. 16 of the Normentafel).

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  Fig. 320. Pharyngeal region of the embryo BR (Normentafel No. 42, 9.75 mm. vertex-breech measurement), from the ventral surface.

II. The Differentiation of the Pharyngeal Pouches - the Second Pharyngeal Pouch and the Tonsils

II. The Differentiation of the Pharyngeal Pouches - the Second Pharyngeal Pouch and the Tonsils

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  Fig. 321. Branchial derivatives of an embryo of 11.7 mm. (nape-length), somewhat simplified.

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  Fig. 322. Dorsal view of the left half of the pharynx of an embryo of 21 mm. (nape-length).

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  Fig. 323. Pharynx of an embryo of 24.4 mm. (nape-length), from the left side, somewhat simplified.

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  Fig. 324. Schema of the branchiogenic derivatives in man, adapted from the schemata of Groschuff and Kohn.

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  Figs. 325 and 326.Two sections through the embryo BR (compare Fig. 320).

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  Figs. 327 and 328. Two sections through the embryo BR (compare Fig. 320).

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  Fig. 329. The branchiogenic organs of an embryo of 26 mm., somewhat simplified. (After Verdun, 1898.)

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  Fig. 330. Section through the laryngeal region of the embryo Nat2 of the First Anatomical Institute, Vienna (19.75 mm. vertex-breech length).

III. The Third to the Fifth Pharyngeal Pouches - the Branchiogenic Organs

III. The Third to the Fifth Pharyngeal Pouches - the Branchiogenic Organs

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