|
|
| (45 intermediate revisions by the same user not shown) |
| Line 1: |
Line 1: |
| == Stage 13 GIT 3D Model ==
| | --[[User:S8600021|Mark Hill]] 07:53, 26 September 2011 (EST) Deleted content from this page as duplication of Gastrointestinal tract [[Gastrointestinal_Tract_-_Carnegie_Stage_13|stage 13]] and [[Gastrointestinal_Tract_-_Carnegie_Stage_22|stage 22]] section images, available from [[Template:Gastrointestinal Tract Links|gastrointestinal links]] pages. |
| The individual serial slices have also been incorporated into a 3D model of this embryo [../Movies/GIT3dmodel.htm Gastrointestinal Tract].
| |
| | |
| == Stage 13/14 Embryo ==
| |
| [../wwwpig/pigb/B1L.htm B1,B2]: Pharynx. Crest in ventral floor of pharynx formed by fusion of 3rd pharyngeal arches = hypopharyngeal eminence (precursor of root of tongue). Rathke's pouch = rudimentary adenohypophysis. | |
| | |
| [../wwwpig/pigb/B3L.htm B3]: Rudimentary thyroid ventral to aortic sac (also seen in B2, ventral to the hypopharyngeal eminence).
| |
| | |
| [../wwwpig/pigb/B4L.htm B4]: Caudal pharynx compressed dorsoventrally. | |
| | |
| [../wwwpig/pigb/B7L.htm B7]: Glottis drawn off from pharyngeal foregut. Nasal placodes. Pulmonary arteries. | |
| | |
| [../wwwpig/pigc/C1L.htm C1,C2]: Commencement of trachea and oesophagus with dense mesenchyme. R. nasal pit.
| |
| | |
| [../wwwpig/pigc/C3L.htm C3,C4]: Common cardinal vein in the posterior wall of the intraembryonic coelom - the pleuropericardial folds which contribute later to the formation of the pleura and pericardium. L. nasal pit. In C4, junction of R common cardinal vein with dorsal wall of sinus venosus. | |
| | |
| [../wwwpig/pigc/C5L.htm C5]: Smaller oesophagus, expanding trachea. Note ventral anchoring of attachment site is at the most cranial extension of the septum transversum. Note also that this attachment now divides the intraembryonic coelom around the trachea into two canals, the L and R pleuro (pericardio-peritoneal) canals. (Canals are lined by coelomic mesothelium and are continuous with whole I-E coelom - they will be referred to hereafter simply as coelomic canals). Note the pleuroperitoneal fold on the medial side of the R common cardinal vein - this fold will form part of the diaphragm.
| |
| | |
| [../wwwpig/pigc/C5L.htm C5,C6]: Lateral extension of pulmonary mesenchyme is moulded to shape of coelomic canals. Oesophagus lumen obliterated (common site of oesophageal atresia and/or tracheo-oesophageal fistula). Prominent R pleuroperitoneal fold. | |
| | |
| [../wwwpig/pigc/C7L.htm C7]: Note dorsal extent of coelomic canals. Oesophagus lumen reappears caudal to bifurcation. Distinct R (smaller on L) pleuroperitoneal fold below the common cardinal vein.
| |
| | |
| [../wwwpig/pigd/D1L.htm Dl]: Oesophagus/stomach junction. Coelomic canals.
| |
| | |
| [../wwwpig/pigd/D2L.htm D2]: Ovoid stomach with developing space of the lesser sac on R. Dorsal and ventral attachments of the mesenchyme are now known as dorsal and ventral mesogastria. Coelomic canals. | |
| | |
| [../wwwpig/pigd/D3L.htm D3]: Rotation of stomach (seen from above) to R side. Note change in outline of coelomic canals due to presence of liver. Lesser sac. Note thick mesothelium lining the coelom along Ledge of stomach, the primordium of the spleen and greater omentum along greater curvature. Liver embedded in septum transversum (ventral border of septum transversum contributes to diaphragm). | |
| | |
| [../wwwpig/pigg/G7L.htm G7]: Caudal pharynx (extending laterally, ventral to dorsal aorta - cf B4). Stomach, mesentery.
| |
| | |
| [../wwwpig/pigg/G6L.htm G6]: Narrow oesophagus. Tracheal bifurcation dorsal to sinus venosus.
| |
