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