File:Thyng1914 plate6.jpg: Difference between revisions

Plate 6. Heart, Venous and Placental Vessels

Reconstruction to show the right atrium and ventricle of the heart; the venous system of the right side; and the left umbilical vein of a 17.8 human embryo (H. E. C. 8.39). X 11.2 diams.

• The entodermal lining of the larynx and trachea are represented as seen in ventral view in plate 6.
• Plate 6 shows some of the cranial nerves on both sides.
• The pharyngeal branch (plate 6) sends a twig to the developing stylo-pharyngeus muscle, and continues cephalad, for a short distance, along the pharynx.
• The superior laryngeal nerve (N.Ls., pi. 3; N.laryng.s., pi. 6) arises at the ganglion nodosum, slightly caudad of its middle. It is represented in plate 3 as a stump, but is shown in part in plate 6.
• The recurrent nerves are displayed in plate 6.
• At the cephaloventral border of the ganglion nodosum of the vagus, the ramus externus (R.ex., plate 3) of the accessory nerve curves laterally and dor sally around the lateral side of the internal jugular vein (plate 6) to the developing sterno-cleido-m.astoid muscle.
• Veins - plate 6 a ventral view of part of the anterior cardinal system.
• The right and left linguo-facial veins (V.ling-fac.) (Grosser '01, Lewis '09, and others) are shown the terminal parts of both are seen in plate 6.
• Immediately cephalad of the pericardial cavity there now opens into the ventral wall of each anterior cardinal a vein (V.thym.-thyr., plate 6) arising from a venous plexus of the thymic and thyreoid anlagen. For this vein the term, vena thymico-thyreoidea, does not seem inappropriate.
• Each subclavian (plate 6) joins the dorso-lateral aspect of the internal jugular vein of its own side somewhat caudal to the place of entrance of the vena thymico-thyreoidea.
• The terminations of the external jugular veins (V.jug.ex.) are distinct in plate 6.
• Lymphatics - The jugular lymph sacs (S.jug.), comparable to those discovered by Sabin ('02) are seen in plate 6.
• The vasa lymphatica superficialia (Vas.lym.sup.), arising from the cephalo-lateral portion of the left lymph sac, are seen plainly in plate 6.

Embryo 17.8 mm Links: Fig 1 | Fig 2 | Plate 1a | Plate 1b | Plate 2a | Plate 2b | Plate 3a | Plate 3b | Plate 4a | Plate 4b | Plate 5a | Plate 5b | Plate 6 | Harvard Collection | Carnegie stage 19

Reference

Thyng FW. The anatomy of a 17.8 mm human embryo. (1914) Amer. J Anat. 17: 31-112.

Cite this page: Hill, M.A. (2024, April 19) Embryology Thyng1914 plate6.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Thyng1914_plate6.jpg

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