Vedangas.

 There are six angas of the Vedas they are Siksha, Vyakarana,chandas, Jyotisha, Nirukta and Kalpa.

Siksha explains the proper pronunciation of the Vedas.

Vyakarana explains the grammar of the vedic words.

chandas explains the meters of the various Riks.

jyotisha helps in deciding the proper time for the performance of the various rituals.

Nirukta gives the meanings of the difficult works in  the vedas.

Kalpa describes the proper method of performing the various rituals mentioned in the Vedas.

The ones connected with the text of the vedas are 

Siksha, Vyakarana, and Chandas.

The ones connected with the meaning of the vedas are 

Jyotisha, Nirukta and Kalpa.