FRONTAL SINUS

A brief review of frontal sinuses
-What is paranasal sinuse
-Frontal sinuse
-Vascular and neuro-vascular supply
-Functions
-Frontal sinusitis

1. PARANASAL SINUSES “a cavity lined with mucous membrane within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities”  Bones of the face and skull near the nose contain four pairs of air-filled pockets, which are called the paranasal sinuses

2. TYPES OF PARANASAL SINUSES  A maxillary sinus in each cheek.  Between six and 12 ethmoid sinuses on each side of the nose between the eyes.  A frontal sinuses on each side in the forehead.  A pair of sphenoid sinuses behind the ethmoid sinuses

3. FRONTAL SINUS

4. DEFINATION: ‘Within the frontal bone,just above the orbital margins are two hallow spaces lined with mucous membrane called frontal air sinuses or frontal sinuses’

5. LOCATION OF FRONTAL SINUSES: The frontal sinuses are located within the lamina of the frontal bone. These can be found behind the superciliary arches, between the bones of the skull and face .

6. FUNCTIONS OF FRONTAL SINUSES  Filter and humidify the air a person breathes  Lighten the weight of the head  Protect vital organs  Maximize voice quality and act as a resonator of voice.  The main function of the sinuses is to produce the mucus that drains into and moisturizes the nose. The mucus itself is important, in that it helps carry pollutants like dust, dirt and microorganisms. When the draining process is hindered, inflammations or infections can result which causes Frontal Sinusitis  Lghten the weight of skull

7. NEUROVASCULAR SUPPLY OF FRONTAL SINUSES  NERVE SUPPLY = Supraorbital nerve and supratrochlear nerve  BLOOD SUPPLY  Arterial supply = supraorbital artery and anterior ethmoidal arteries  Veinous drainage = venous plexuses of nose and supraorbital vein  LYMPHATIC DRAINAGE = Lyphatic vessel drain into submandibular nodes

8. NEUROVASCULAR SUPPLY

9. Frontal Sinusitis  This is a condition affecting the sinuses and is characterized by a swelling of the Frontal or Ethmoid Sinuses.It is usually caused due to a blockage or obstruction of the Ethmoid Sinuses.  An Ethmoid Sinus obstruction typically results in a swelling of the Frontal Sinuses and leads to impaired mucus drainage, due to its closeness to the orbit and cranial cavity, inflammation of the frontal sinus may also cause other severe complications part from Frontal Sinusitis. These include disorders like:  Epidural abscess  M eningitis  O rbital cellulitis  Subdural abscess