<prompt> Which of the following blood vessels does not take pa in anastomosis in the area encircled in red of the nasal septum?Sphenopalatine aerySuperior labial aeryPosterior ethmoidal aeryGreater palatine aery  <response>: Littles area or Kiesselbachs plexus:This is the vascular area in the anteroinferior pa of nasal septum just above the vestibule. Anterior ethmoidal, sphenopalatine, greater palatine and septal branch of superior labial aeries and their corresponding veins form an anastomosis here. This is the commonest site for epistaxis. This is also the site for the origin of the bleeding polypus haemangioma of the nasal septum.Ref: Dhingra; 6th ed; Pg: 147 