comment_forms in core/modules/comment/comment.module
Implements hook_forms().
comment_node_page_additions in core/modules/comment/comment.module
Builds the comment-related elements for node detail pages.
comment_preprocess_node in core/modules/comment/comment.module
Prepares variables for comment.tpl.php
comment_reply in core/modules/comment/comment.pages.inc
Form constructor for the comment reply form.
node.tpl.php in core/themes/bartik/templates/node.tpl.php
Bartik's theme implementation to display a node.
node.tpl.php in core/modules/node/templates/node.tpl.php
Default theme implementation to display a node.