somite

Embryonic body block

A somite is one of the paired blocks of tissue that form along the developing spine in vertebrate embryos.

These segments give rise to the vertebrae, ribs, skeletal muscles, and dermis.

The term appears mainly in embryology and developmental biology: The human embryo develops about 42 somites during the first few weeks of gestation.

development

differentiation

Recognizing meaningful differences

proliferationRapid increase in quantity
maturationProcess of becoming complete
formationCreation or arrangement

condensation · budding · patterning · specification · determination · sequential · periodic · oscillation · Hox genes · signaling

embryology

gastrulation

Embryo forms primary layers

organogenesisEmbryonic tissue becoming structures
notochordEmbryonic axial support structure
neural tubeEmbryonic nervous system precursor

morphogenesis · segmentation · ectoderm · endoderm · induction · body plan

anatomy

dermatome

Nerve's cutaneous territory

epithelialSurface-lining tissue type
axialAlong a rotation line
vertebraeInterlocking bones of spine

ribs · dermis · skeletal muscle · trunk · bilateral

invertebrate

annelid

Segmented worm phylum member

arthropodJointed-limb invertebrate phylum
segmentationDivision into sections
polychaeteSegmented marine annelid

earthworm · leech · body segments · serial homology · coelom · septum

prenatal

embryo

Organism before birth

fetusGestating offspring
zygoteFirst embryonic cell
blastocystEarly developmental stage before implantation

gestation · placenta · amnion · chorion · uterine · implantation · trimester · prenatal · intrauterine · organogenesis

Opposites

embryonic tissue organization

somitenotochord

Embryonic axial support structure

germ layer derivation

somiteectoderm

Embryo's outer cell layer

endoderm · neural tube

Family

chromosome, somatic, soma, psychosomatic, mesoderm, somatotype

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