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Fig. 6. Facial-acoustic Complex Human Embryo 7 mm

Sagittal section of a 7 mm. human embryo (B. 17), showing the relations of the facial-acoustic complex.

In Fig. 6 the ventral or motor division of the facial nerve can be seen cut obliquely at the ventral edge of the geniculate ganglion. In this embryo the dorsal root or pars intermedius is fully as large as the ventral or motor root; but the proportion is gradually reversed as one looks through older stages, due to the more rapid growth of the ventral root. The pars intermedius is in this sense a more prominent structure in fetal life than in the adult, indicating that phylogenetically it has played a more important role in lower forms than in man. With the development of the connective tissue the geniculate ganglion becomes inclosed in a sheath, and is walled off from the motor root, against which it continues to lie, as may be seen in Fig. 8.


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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)
Mall 1906 Links: Fig 1. 14mm Embryo | Fig 2. 30mm Embryo | Fig 3. Semicircular canal | Fig 4. Membranous Labyrinth | Fig 5. Acoustic nerve complex | Fig 6. Facial-acoustic Complex | Fig 7. Facial Nerve Pig Embryo 20 cm | Fig 8. Geniculate Ganglion | Plate 1. Human Embryo 4 to 20 mm | Plate 2. Human Embryo 30 mm | Membranous Labyrinth and Nerves

Reference

Streeter GL. On the development of the membranous labyrinth and the acoustic and facial nerves in the human embryo. (1906) Amer. J Anat. 6:139-165.


Cite this page: Hill, M.A. (2024, February 21) Embryology Streeter1906 fig06.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter1906_fig06.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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