chorda dorsalis
ectoderm
back
backbone
rachis
spinal column
spine
vertebral column
urochord
ape-men
backstrap
bowie knife
brassie
crysknife
epiglottis
e¤usion
fringing
green-gray
hipbone
hook-like
hunter-gatherers
keratin
kris
landing net
lymphangitis
periosteum
scourer
sharkskin
side-wheeler
striatal
strick
syllabi
tegmental
umbilicus