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Plate 14

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Illustrating Dr. Milnes Marshall's Paper on the " Morphology of the Vertebrate Olfactory Organ."

Each figure has been drawn from a single section by the aid of a Hartnack camera. The numbers attached indicate, in diameters, the magnifying power employed in each case. The majority of the figures are of a semi-diagrammatical nature, the mesoblast being in nearly all cases omitted for the sake of clearness; the outlines are, however, strictly accurate in all cases. Figures 21, 22, 27, and 28 are drawn from sections kindly lent me for the purpose by Mr. Balfour ; the rest are from specimens of my own preparation.

Alphabetical List of References

ah Alimentary canal. aV . Anterior prolongation of alimentary canal. aor. Dorsal aorta. a. r. Anterior root of a spinal nerve. mtcl. Auditory vesicle. b. a. Branchial artery. br. 1. First branchial arch. br. 2. Second branchial arch. c. h. cerebral hemisphere. f. b. forebrain, g. gill. h. 2. Second head-cavity. h . b. Hiudbrain. hi/. Hyoid arch. inf. Infundibulum, I. c. Lachrymal cleft. m. b. Midbrain. Mn. Mandibular arch. m. p. Muscle plate. 3f.v. Maxillary arch. u. Notochord. o. c. Optic cup or eye. olf. Olfactory pit. ol. V. Olfactory vesicle or lobe. r. i. Inferior rectus muscle. r. s. Superior rectus muscle. Sch. Schneiderian folds. sp. Spinal cord. tr. Trabecula3 cranii. v. c. Visceral cleft. I. Olfactory nerve. II. Optic nerve. III. Third or oculomotor nerve. V. Trigeminal nerve. V a. Opiithalmic branch of the trigeminal nerve, or ramus ophthalmicus profundus. V 3. Inferior maxillary branch of the trigeminal nerve. VII. Facial nerve. VII a. Ophthalmic branch of the facial nerve, or ramus ophthalmicus superficialis. VIII. Auditory nerve. IX. Glossopharyngeal nerve. X. Vagus or pneumogastric nerve.


Fig. 19. — Transverse section through the forebrain of a dogfish embryo of stage M, showing olfactory pits and nerves, with absence of olfactory lobes. Chromic and osmic acids, x 27 diam.

Fig. 20. — Transverse section through the same region as in the preceding figure, but in a dogfish embryo at the commencement of stage o : shows olfactory pits with Schneiderian folds, olfactory nerve, and commencing olfactory lobe. Chromic and osmic acids, x 27 diam.

Fig. 21. — Transverse section through the forepart of the head of a dogfish embryo at a stage intermediate between o and r, showing the forebrain, the olfactory pits, and on the left side the olfactory nerve and olfactory lobe. X 17 diam.

Fig. 22. — Transverse section through the forepart of the head of a dogfish embryo of stage Q, showing the cerebral hemispheres, olfactory lobes, olfactory nerves, and olfactory pits with their Schneiderian folds, x 9 diam.

Figs. 23 — 26. — Sections through a dogfish embryo of stage n, showing the resemblances between the gills and the Schneiderian folds. Chromic and osmic acids.

Fig. 23. — Longitudinal and horizontal section through the head, showing fore- and hinclbrain, third and trigeminal nerves, eyes and olfactory pits. X 20 diam.

Fig, 24. — Transverse section through forepart of body, showing spinal cord, with anterior and posterior roots of a spinal nerve, vagus nerve, cardiac and dorsal aorta, branchial arteries, pharynx and gills. X 20 diam.

Fig. 25. — The right olfactory organ fi-om the same section as fig. 23 more highly magnified, showing the characters of the Schneiderian folds. X 90 diam.

Fig. 26. — The left gill from fig. 2i more highly magnified, showing histological characters of the gill folds, x 90 diam.

Figs. 27 and 28. — Sections from a dogfish embryo about stage o, showing resemblance between gills and Schneiderian folds at a rather later period. X 90 diam.

Fig. 27. — Through Schneiderian folds.

Fig. 28.— Through gill.

Fig. 29. — Transverse section through the anterior extremity of the head of a trout embryo on the twenty-seventh day after fertilisation of the ova, showing forebrain, olfactory pits, and on the left side the olfactory nerve. Picric acid. X 56 diam.

Fig. 30. — Longitudinal and vertical section through the head of a trout embryo on the thirtieth day, showing mid- and hindbrains, roots of visceral arches and clefts, and the olfactory pit. Picric acid, x 56 diam.

Fig. 31. — Transverse section through the anterior extremity of the head of a salmon embryo about the time of hatching, showing olfactory pits, trabecular plate, and anterior prolongations of the buccal cavity. Chromic and osmic acids. X 27 diam.

Fiig. 32. — Transverse section through the forepart of the head of a salmon embryo about a week after hatching, showing forebrain, eyes, olfactory pits, and paired-anterior diverticula of the buccal cavity. Picric acid. X 27 diam.

Fig. 33. — Transverse section through the forepart of the head of a salmon embryo two days after hatching, showing forebrain, and on the left side tlie eye, on the right the olfactory nerve and organ. Chromic and osmic acids, X 35 diam.

Figs, 34 and 35, — Longitudinal and vertical sections through the head of a salmon embryo of the same age as that in the preceding figure. Chromic and osmic acids. X 27 diam.

Fig. 34. — Section taken close to median line, showing root of olfactory nerve, optic nerves, infundibulum, and anterior prolongation of buccal cavity.

Fig. 35. — More superficial section, showing olfactory pit, eye, pharynx with its branchial arches, and the anterior prolongation of the buccal cavity.

Fig. 36. — Longitudinal and vertical section through the forepart of the cerebral hemisphere, the olfactory lobe and olfactory nerve of a twelve-day chick embryo. Picric acid, x 17 diam.

Figs. 37, 39 — Transverse sections through same region as preceding figure in a twelve-day chick embryo. Picric acid, x 17 diam.

Fig, 37. — Through the olfactory nerve.

Fig, 38, — Through the olfactory lobe.

Fig. 39. — Through the anterior part of the cerebral hemisphere.

Alphabetical List of References
ah. Alimentary canal. aV. Anterior prolongation of alimentary canal. ao.r Dorsal aorta. a. r. Anterior root of a spinal nerve. mtcl. Auditory vesicle. b. a. Branchial artery. br. 1. First branchial arch. br. 2. Second branchial arch. c. h. cerebral hemisphere. f. b. forebrain, g. gill. h. 2. Second head-cavity. h . b. Hindbrain. hy. Hyoid arch. inf. Infundibulum, I. c. Lachrymal cleft. m. b. Midbrain. Mn. Mandibular arch. m. p. Muscle plate. M.v. Maxillary arch. n. Notochord. o. c. Optic cup or eye. olf. Olfactory pit. ol. V. Olfactory vesicle or lobe. r. i. Inferior rectus muscle. r. s. Superior rectus muscle. Sch. Schneiderian folds. sp. Spinal cord. tr. Trabecula3 cranii. v. c. Visceral cleft. I. Olfactory nerve. II. Optic nerve. III. Third or oculomotor nerve. V. Trigeminal nerve. V a. Opiithalmic branch of the trigeminal nerve, or ramus ophthalmicus profundus. V 3. Inferior maxillary branch of the trigeminal nerve. VII. Facial nerve. VII a. Ophthalmic branch of the facial nerve, or ramus ophthalmicus superficialis. VIII. Auditory nerve. IX. Glossopharyngeal nerve. X. Vagus or pneumogastric nerve.
Historic Disclaimer - information about historic embryology pages 
Mark Hill.jpg
Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Vertebrate Olfactory Organ: Plate 13 | Plate 14 | Fig. 01 | Fig. 02 | Fig. 19 | Fig. 20 | 1879 Paper



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