Pelvic girdleor bony cavities

Pelvic girdle/bony cavities:

It is formed by two os-coxae(illium+ischium+pubis)or hip bones,sacrum and first few caudal vertebrae.

Ossa-coxarum=os-coxae+os-coxae.

Pelvic inlet: It is formed-

*Dorsally by cranial border of sacrum

*Laterally by shaft of Ilium

*Ventrally cranial border of pubic bone.

Thoracic inlet:Is formed-

*Dorsally by first thoracic vertebra

*Laterally by first pair of ribs

*Ventrally by manubrium of sternum

Thorasic case/bony thorax:is formed-

*Dorsally by series of thorasic vertebra

*Laterally by 13 pairs of ribs

*Ventrally by sternum