Median Osseocartilenous portion b/w the two nasal halves of nasal cavity.
Forms a mucus membrane covered medial wall of both nasal cavities.
Because of world functions on dominance, so does our nasal septum.
There is rarely strictly median septum. Deviation occurs due to over growth of one of the side thus deflecting the septum towards recessive/lesser grown side.
It’s a Tri Component Structure
1) Vomer
2) perpendicular plate of ethmoid bone
3) marginal contribution by
a) frontal bone-nasal spine
b) sphenoid bone-rostrum
c) nasal, palatine & maxillary nasal crests
1) septal
2) septal process of inferior nasal cartilage
Fibro fatty tissue covered by skin
4 Borders : superior, inferior, anterior, posterior
2 Surfaces : Right and Left
Anterior:
⇒SUPERIOR- Anterior and posterior ethmoidal artery
⇒INFERIOR- Superior labial branch of Labial artery
Posterior:
⇒SUPERIOR- Sphenopalatine artery (main artery)
⇒INFERIOR- Greater Palatine artery
Venous plexus is formed in the lower part of nasal septum/ Littles area which drains into:
Anteriorly: Facial Vein
Posteriorly: Pterygoid venous plexus through sphenopalatine vein
Kiesselbach’s Plexus also called Little’s Area ⇒ this is the most common site of epistaxis/nasal bleeding ⇒ Present in the Antero inferior part
Formed by the anastomoses of:
- Septal ramus of superior labial artery, (branch of Facial artery)
- Branch of sphenopalatine artery,
- Greater palatine artery,
- Anterior ethmoidal artery
LYMPHATICS
Ant – sub-mandibular nodes
Post – retropharyngeal & deep cervical nodes
NERVE SUPPLY
1) General Sensory arising from Trigeminal Nerve
Ant : Sup : Internal Nasal br.of Ant.Ethmoidal Nerve
Inf : Anterior Superior Alveolar Nerve
Post : Sup : Medial PosteroSuperior Nasal branch of Pterygopalatine Ganglion
Inf : Nasopalataine branch of Pterygopalatine Ganglion
2) Special Sensory Nerve/Olfactory Nerve/Oh God That Smells So Good Nerve confined to Upper/Olfactory Area
—Contributed by Dharmin Doshi and Prajwal Shetty