Summary
The embryonic development of the laboratory house shrew (Suncus murinus) was observed during the period from 13 to 29 pairs of somites and was compared with that of other mammalian species. This period ranged from 10 to 12 days after fertilization. Embryos were allocated to stages 11A–C and 12A–C according to somitic count. These embryos were characterized by the following features. 1. The curvature of the body became gradually enhanced, changing from a parenthesis-like to a bracket-like shape. 2. The swelling of the future hindlimb bud appeared at stage 11 A, while the forelimb bud became apparent at stage 12 A. The latter developed rapidly and had exceeded the former in size by the end of stage 12C. 3. The timing of closure of the cephalic neuropores varied, but the order of closure is constant. The prosencephalic neuropore closed later. The caudal neuropore still existed even at the end of stage 12C. 4. In all of the cranial nerve ganglia except for the auditory one, crest-derived cells seemed to contribute to the initial formation, while placodal cells seemed to be involved later. A different pattern of primordial formation was observed between trigeminal/facial and glossopharyngeal/vagal ganglia. 5. By the end of stage 12C, the eye cup and nasal pit began to form, and the endolymphatic appendage also appeared. 6. In the heart, the sinus valves were well developed, and the atrium and ventricle were being divided by the developing interatrial septum I and interventricular septum, respectively. 7. The thyroid primordium was temporarily everted and projected into the pharynx. The internal structure of this protruding thyroid resembled “tuberculum thyroideum” observed in the human embryo.
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Abbreviations
- AA1-4 :
-
1st, 2nd, 3rd, and 4th aortic arches
- AC :
-
axial condensation
- Acc :
-
accessory nerve
- AlC :
-
alimentary canal
- AT :
-
arterial trunk
- At :
-
atrium
- CE :
-
cardiac eminence
- Clo :
-
cloaca
- ClM :
-
cloacal membrane
- CN :
-
caudal neuropore
- Co :
-
intraembryonic coelom
- DA :
-
dorsal aorta
- Di :
-
diencephalon
- DMg :
-
dorsal mesogastrium
- DP :
-
dorsal pancreas
- DR :
-
dorsal pharyngeal ridge
- EP1-2 :
-
1st and 2nd epipharyngeal placodes
- FB :
-
forelimb bud
- G5 :
-
7–10, trigeminal, facial, auditory, glossopharyngeal, and vagal ganglion primordia
- Gb :
-
gall bladder
- HB :
-
hindlimb bud
- HbS :
-
swelling of future hindlimb bud
- HC :
-
hepatic cord
- HD :
-
hepatic diverticulum
- lAA6 :
-
left 6th aortic arch
- lLB :
-
left lung bud
- LP :
-
lens placode
- lVt :
-
left ventricle
- Ma :
-
maxillary process
- MnT :
-
mesonephric tubule
- Mn :
-
mandibular process
- NaP :
-
nasal placode
- ND :
-
nephric duct
- NF :
-
neural fold
- Nc :
-
notochord
- NP :
-
neural plate
- NT :
-
neural tube
- NV :
-
nephric vesicle
- OB :
-
omental bursa
- OpV :
-
optic vesicle
- OV :
-
otic vesicle
- PA1-4 :
-
1st, 2nd, 3rd, and 4th pharyngeal arches
- PAF :
-
interatrial foramen I
- PBr :
-
primary bronchi
- Ph :
-
pharynx
- PP3 :
-
3rd pharyngeal pouch
- rAA6 :
-
right 6th aortic arch
- RCV :
-
rostral cardinal vein
- RD :
-
respiratory diverticulum
- ReP :
-
retinal plate
- rLB :
-
right lung bud
- RP :
-
Rathke's pouch
- rVt :
-
right ventricle
- So :
-
somite
- Sm :
-
stomach
- SV :
-
sinus venosus
- Tel :
-
telencephalon
- Th :
-
thyroid primordium
- Thm :
-
thymus
- VP :
-
ventral pancreas
- Vt :
-
ventricle
- VV :
-
vitelline vein
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Yasui, K. Embryonic development of the house shrew (Suncus murinus). Anat Embryol 187, 45–65 (1993). https://doi.org/10.1007/BF00208196
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DOI: https://doi.org/10.1007/BF00208196