Question about key fingerprint

[HardKor]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Hello,

Usualy, gpg key checks are made comparing the fingerprint of the signing
key.
I don't understand how the integrity of the subkey or of the informations
like name or email is protected by this way.
Is the entire GnuPG key block (including subkeys and owner informations)
signed by the master key ?

Thanks for you help,

HardKor
5845 16EB 0589 B89A 5E6E  98DE 74F5 F875 6D34 45F9

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
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=6qWz
-----END PGP SIGNATURE-----
-------------- next part --------------
An HTML attachment was scrubbed...
URL: </pipermail/attachments/20120810/4b1c431a/attachment-0001.htm>