関連ワード:
what is the trachea made out of what is the spinal cord made out of what is the larynx made out of what is the windpipe made out of what is bronchi made out of what cartilage is the trachea made out of what tissue is the trachea made out of what is the larynx made up of what tissue is the trachea made up of what cartilage is the trachea made up of
