Respiratory System - Carnegie Stage 13

From Embryology

Introduction

Stage14 respiratory tract.jpg Stage13-GIT-icon.jpg

Respiratory

The individual serial slices have also been incorporated into a 3D model of this embryo.
  • Stage 13 - Week 4, 26 - 30 days, 3 - 5 mm, Somite Number 21 - 29

The table below shows a thumbnail view of each section and a brief description of related respiratory components.


Respiratory Links: respiratory | Science Lecture | Lecture Movie | Med Lecture | Stage 13 | Stage 22 | Upper Respiratory Tract | diaphragm | Histology | Postnatal | respiratory abnormalities | Respiratory Quiz | Respiratory terms | Category:Respiratory
Historic Embryology  
1902 The Nasal Cavities and Olfactory Structures | 1906 Lung | 1912 Upper Respiratory Tract | 1912 Respiratory | 1914 Phrenic Nerve | 1918 Respiratory images | 1921 Respiratory | 1922 Chick Pulmonary Vessels | 1934 Right Fetal Lung | 1936 Early Human Lung | 1937 Terminal Air Passages | 1938 Human Histology
| Carnegie stage 13
Stage 13 - Respiratory
Section Name Description
Stage 13 image 057.jpg

Stage 13 image 058.jpg

B1L


B2L

Pharynx.

Crest in ventral floor of pharynx formed by fusion of 3rd pharyngeal arches = hypopharyngeal eminence (precursor of root of tongue).

Rathke's pouch forming the rudimentary adenohypophysis (anterior pituitary).

Stage 13 image 059.jpg B3L Rudimentary thyroid ventral to aortic sac (also seen in B2, ventral to the hypopharyngeal eminence).
Stage 13 image 060.jpg B4L Caudal pharynx compressed dorsoventrally.
Stage 13 image 063.jpg B7L Glottis drawn off from pharyngeal foregut.

Nasal placodes. Pulmonary arteries.

Stage 13 image 064.jpg

Stage 13 image 065.jpg

C1L


C2L

Commencement of trachea and oesophagus with dense mesenchyme.

Right nasal pit.

Stage 13 image 066.jpg

Stage 13 image 067.jpg

C3L


C4L

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.

In C4, junction of right common cardinal vein with dorsal wall of sinus venosus.

Left nasal pit.

Stage 13 image 068.jpg C5L 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.

Stage 13 image 068.jpg

Stage 13 image 069.jpg

C5L


C6L

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.
Stage 13 image 070.jpg C7L Note dorsal extent of coelomic canals.

Oesophagus lumen reappears caudal to bifurcation.

Distinct R (smaller on L) pleuroperitoneal fold below the common cardinal vein.

Stage 13 image 071.jpg D1L Oesophagus/stomach junction. Coelomic canals.
Stage 13 image 072.jpg D2L 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.

Stage 13 image 098.jpg G7L Caudal pharynx (extending laterally, ventral to dorsal aorta - cf B4). Stomach, mesentery
Stage 13 image 097.jpg G6L Narrow oesophagus. Tracheal bifurcation dorsal to sinus venosus.

All Sections

Stage 13 (serial labeled images)
Stage 13 image 050.jpg Stage 13 image 051.jpg Stage 13 image 052.jpg Stage 13 image 053.jpg Stage 13 image 054.jpg Stage 13 image 055.jpg Stage 13 image 056.jpg
A1L A2L A3L A4L A5L A6L A7L
Stage 13 image 057.jpg Stage 13 image 058.jpg Stage 13 image 059.jpg Stage 13 image 060.jpg Stage 13 image 061.jpg Stage 13 image 062.jpg Stage 13 image 063.jpg
B1L B2L B3L B4L B5L B6L B7L
Stage 13 image 064.jpg Stage 13 image 065.jpg Stage 13 image 066.jpg Stage 13 image 067.jpg Stage 13 image 068.jpg Stage 13 image 069.jpg Stage 13 image 070.jpg
C1L C2L C3L C4L C5L C6L C7L
Stage 13 image 071.jpg Stage 13 image 072.jpg Stage 13 image 073.jpg Stage 13 image 074.jpg Stage 13 image 075.jpg Stage 13 image 076.jpg Stage 13 image 077.jpg
D1L D2L D3L D4L D5L D6L D7L
Stage 13 image 078.jpg Stage 13 image 079.jpg Stage 13 image 080.jpg Stage 13 image 081.jpg Stage 13 image 082.jpg Stage 13 image 083.jpg Stage 13 image 084.jpg
E1L E2L E3L E4L E5L E6L E7L
Stage 13 image 085.jpg Stage 13 image 086.jpg Stage 13 image 087.jpg Stage 13 image 088.jpg Stage 13 image 089.jpg Stage 13 image 090.jpg Stage 13 image 091.jpg
F1L F2L F3L F4L F5L F6L F7L
Stage 13 image 092.jpg Stage 13 image 093.jpg Stage 13 image 094.jpg Stage 13 image 095.jpg Stage 13 image 096.jpg Stage 13 image 097.jpg Stage 13 image 098.jpg
G1L G2L G3L G4L G5L G6L G7L

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Cite this page: Hill, M.A. (2018, December 13) Embryology Respiratory System - Carnegie Stage 13. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Respiratory_System_-_Carnegie_Stage_13

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© Dr Mark Hill 2018, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G