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Stage 1 / 1 day Stage 2 / 2-3 days Stage 3-1 / 4 days Stage 3-2 / 4-5 days Stage 4 / 6 days Stage 5a-1 / 7 days Stage 5a-2 / 8 days Stage 5b / 9 days Stage 5c / 12 days Stage 6 / 13-17 days Stage 7 / 16-19 days Stage 8 / 23 days Stage 9 / 25 days Stage 10 / 28 days Stage 11 / 29 days Stage 12 / 30 days Stage 13 / 32 days Stage 14 / 33 days Stage 15 / 36 days Stage 16 / 39 days Stage 17 / 41 days Stage 18 / 44 days Stage 19 / 45-47 days Stage 20 / 49 days Stage 21 / 49-52 days Stage 22 / 52-55 days Stage 23 / 56 days

Carnegie Stage Section

Abbreviation Key

a
artery
aa
arteries
ant
anterior
a-v
atrio-ventricular
C
Cervical
Co
Coccygeal
CN
Cranial Nerve
D
diencephalic neuromere or diencephalon
dm
dermatomyotome
inf
inferior
int
internal
L
Lumbar
lat
lateral
lt
left
M
mesencephalic neuromere or mesencephalon
med
medial
n
nerve
O
Occipital
P
prosencephalon
post
posterior
prim
primordial
R
rhombencephalon
Rh
rhombomere
rt
right
S
Sacral
T
Thoracic
v
vein
vv
veins
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C-4 / C-5 intervertebral disc, C-5 spinal nerve, C-6 spinal ganglion, anterior communicating artery, artifact fracture(s), body of hyoid (pharyngeal arch 3 cartilage), centrum of C-5 vertebra, choroid plexus, common carotid artery, cricoid cartilage, falx cerebri region, hypoglossal nerve (CN XII), infra-orbital nerve, intraretinal space (optic vesicle cavity), jugular lymph sac, lateral ventricle, levator scapulae muscle, masseter muscle, neural layer of retina, pharyngeal arch 1 cartilage (Meckel), pigmented layer of retina, sternocleidomastoid muscle, subarachnoid space, submandibular gland, sympathetic trunk, thyroid cartilage, tongue raphe
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Boyd Embryo #H983   |   Location: 75-1-1

Keywords: C-4 / C-5 intervertebral disc, C-5 spinal nerve, C-6 spinal ganglion, anterior communicating artery, artifact fracture(s), body of hyoid (pharyngeal arch 3 cartilage), centrum of C-5 vertebra, choroid plexus, common carotid artery, cricoid cartilage, falx cerebri region, hypoglossal nerve (CN XII), infra-orbital nerve, intraretinal space (optic vesicle cavity), jugular lymph sac, lateral ventricle, levator scapulae muscle, masseter muscle, neural layer of retina, pharyngeal arch 1 cartilage (Meckel), pigmented layer of retina, sternocleidomastoid muscle, subarachnoid space, submandibular gland, sympathetic trunk, thyroid cartilage, tongue raphe

Source: The Virtual Human Embryo.