The frontal sinuses are air-filled pockets located within the frontal bone of the skull. They are positioned behind the superciliary arches and between the skull and face bones. The frontal sinuses function to lighten the skull, humidify air, and protect underlying structures. Frontal sinusitis is inflammation of the frontal sinuses which can occur when mucus drainage is obstructed, leading to infection or swelling. Complications of frontal sinusitis include epidural abscess, meningitis, orbital cellulitis, or subdural abscess due to the sinuses' proximity to the brain and eyes.

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’

6. 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.

11. 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

12. 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

13. NEUROVASCULAR SUPPLY

14. 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
 Meningitis
 Orbital cellulitis
 Subdural abscess