<prompt> All of the following are true about neck dissection except:Central compament neck dissection involves removal of level VI LNsSupraomohyoid neck dissection involves removal of level I-III LNsType II MRND preserves both spinal accessory nerve and sternocleidomastoid muscleLateral neck dissection: removal of level II-V lymph nodes internal jugular vein  <response>: Neck dissection Comprehensive neck dissection Selective neck dissection Radical neck dissectionRND: Removal of lymph nodes I-V spinal accessory nerveSAN Internal jugular veinIJV sternocleidomastoid muscleSCM Extended radical neck dissectionERND: Radical neck dissection removal of one or more groups of lymph nodes, non-lymphatic structures or both Bilateral radical neck dissection Modified radical neck dissectionMRND: Removal of level I-V lymph nodes with Mnemonic: SIS - Type I: Preserves only SAN - Type II: preserves both SAN and IJV - Type III: preserves SAN ,IJV, SCM Functional neck dissection Supramohyoid neck Dissection: Removal of level I-III LNs. Extended supraomohyoid neck dissection: Removal of level I-IV LNs Posterolateral Neck dissection: Removal of level II-V LNs Suboccipital LNs retro auricular LNs. - Lateral neck dissection: Removal of level II-V LNs Internal jugular vein. - Central compament neck dissection: Removal of level VI LNs 