Rectus fascia is obtained from the rectus abdominis muscle. This is encountered when harvesting rib grafts and is extracted from the same incision.
Temporalis fascia is obtained from the temporalis muscle. This is harvested from an incision one inch above the right ear.
The harvest of either of these tissues causes mild and temporary discomfort with movement of the muscle (activation of abdominal muscles [rectus] and chewing [temporalis]). It does not cause any permanent dysfunction of these muscles and these tissues regenerate.