Anatomy of the Nose

External Nose- Bony

External Nose- Cartilaginous

Dangerous area of the face Dangerous area of the nasal cavity

Nasal cavity Medial wall (Septum) Lateral wall Roof Floor Respiratory Olfactory Vestibule Anterior nares (nostrils) Posterior nares (choanae)

Vestibule

Nasal septum Bony Cartilaginous Membranous Perpendicular plate of ethmoid Perpendicular plate of Vomer Nasal crest of maxilla Nasal crest of palatine bone Rostrum of sphenoid Cartilaginous Quadrilateral cartilage Membranous Forms the columella

Lateral wall of nasal cavity

Ostio-meatal Complex (OMC)

Mucosa Respiratory area Olfactory area Vestibule Pseudo stratified ciliated columnar epithelium Mucous glands and goblet cells Olfactory area Vestibule Skin Turbinates: Vasular with submucosal sinusoids (Cavernous tissue)

Blood supply

                                                          

Little’s area Caudal part of the nasal septum which has a rich submucosal arterial network: Septal branches of Anterior ethmoidal Sphenopalatine Greater palatine Superior labial Prone for drying effect of inspired air and to microtrauma due to picking of the nose Commonest cause and site of epistaxis in children DD: Bleeding from retrocolumellar vein

Sphenopalatine artery is considered as THE artery of epistaxis

Nerve supply Maxillary N Anterior ethmoidal N Olfactory Sphenopalatine Lesser and greater palatine Anterior ethmoidal N Olfactory Autonomic- Vidian N

Lymphatic drainage Anterior part Posterior part Submandibular lymph nodes Posterior part Retropharyngeal lymph nodes Jugulo-digastric lymph nodes

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