This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Lymphatic drainage of anterior pa of nose is to? 
Select and explain. 
A. Submandibular LN, B. Parotid, C. Pretracheal LN, D. Retropharyngeal LN
A: Submandibular LN
Answer: A: Submandibular LN 
Explanation: Ans. is 'a' i.e., Submandibular LNAnetrior half of nasal cavity (including anterior pa of nasal septum) drains into submandibular nodes. Submandibular nodes These nodes lie deep to investing layer of deep cervical fascia in submandibular triangle, between the deep fascia and submandibular gland.These nodes receive afferents from centre of forehead; anterior pa of nasal cavity; frontal, maxillary and ethmoidal air sinuses; inner canthus (medial angle of eye); whole of upper lip and anterior pa of cheek with underlying gum and teeth; outer pa of lower lip with lower gums and teeth excluding incisors; anterior two third of tongue excluding the tip; floor of mouth; and angle of mouth.These nodes also receives efferents of submental nodes.Submandibular nodes drain into (efferent) upper and lower deep cervical nodes.