Internal Organ
noun, の adjective
Inside internal organs are your internal organs, though you'd think the second kanji would give a hint to that without the 内.
ないぞう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
ご近所さんのガレージで鹿の内臓を取り出すんです。
They take the internal organs out of deer in my neighbor’s garage.