The atrial septum divides the right from the left atrium. The atria are smaller, less muscular chambers of the heart that sit atop the powerful ventricles.
Atriotomy is surgical incision of an upper heart chamber.
Septal
Cricothyroidotomy is the medical term meaning surgical incision into the cricoid.
encephelotomy
Sphenoidotomy is the medical term meaning surgical incision into the sphenoid bone or sinus.
Adenotomy is surgical incision into a gland.
Thymotomy is surgical incision of the thymus.Thymotomy.
Labyrinthotomy is surgical incision of the labyrinth.
Vagotomy is the medical term meaning surgical incision of the vagus nerve.
The medical term for incision of a membrane is "fenestration."
Cerebrotomy is surgical incision into the cerebrum.
Onychotomy is surgical incision of the fingernail or toenail.
Sinusotomy (sigh-nuhs-OT-oh-mee) is the medical term meaning surgical incision into a sinus. This procedure is used in the treatment of chronic sinusitis.