Because of the particularities of its skeletal the skeletal muscular system has adaptive ones.The trunk musculature shrinks and disappears. meanwhile many new muscules which exist only in chelonia come into existenec such as m. testo-coracoideus

m. testo-scapula coracoideus

m. (esto-superctrvico-cutaneus. m. testo-cervicalis

m. testo-iliacus

m. testo-caudalis etc. Some former muscules also attach to the carapace

plastron in order to withdraw much quikly the head

neck

fore-hind-limbs and tail into the shell when it is disturbed. M. masseter and m. temporalis are strong. Two pairs of m. coraco-hyoicieus

a pair of m. pubo-caudalis instead of m. ilio-caudalis and a pair of long and thin muscules originating from the vertebral colum and attaching to the ventral of cloaca are obserred. The appendicular muscles and tail muscules are very strong.