AN
ASSIGNMENT
ON
' PARANASAL AIR SINUS '
UNDER THE GUIDANCE OF:
DR. SWAPAN KUMAR HALDAR (PROF & H.O.D)
DR. ARINDAM PAL (LECTURER)
DEPT.- HUMAN ANATOMY.
PARANASAL SINUSES
DISSECTION
, Remove the thin medial walls of the ethmoidal air cells, and look for the continuity
with the mucous membrane of the nose. Remove the medial wall of maxillary air
sinus extending anteriorly from opening of nasolacrimal duct till the greater palatine
canal posteriorly. Now maxillary air sinus can be seen. Remove part of the roof of
maxillary air sinus so that the maxillary nerve and pterygopalatine ganglion are
identifiable in the pterygopalatine fossa. Trace the infraorbital nerve in infraorbital
canal in floor of orbit. Try to locate the sinuous course of anterior superior alveolar
nerve into the upper incisor teeth.
FEATURES
Paranasal sinuses are air filled spaces present within some bones around the nasal
cavities. The sinuses, are frontal, maxillary, sphenoidal and ethmoidal. All of them
open into the nasal cavity through its lateral wall. The function of the sinuses is to
make the skull lighter and add resonance to the voice. In infections of the sinuses or
sinusitis, the voice is altered. The sinuses are rudimentary, or even absent at birth.
They enlarge rapidly during the ages of 6 to 7 years, i.e. time of eruption of
permanent teeth and then after puberty. From birth to adult life, the growth of the
sinuses is due to enlargement of the bones; in old age it is due to due to surrounding
cancellous bones. The anatomy of individual sinuses is important as they are
frequently infanted.
FRONTAL SINUS
1. The frontal sinus lies in the frontal bone deep to the superciliary arch. It extends
upwards above the medial end of the eyebrow, and backwards into the medial part
of the roof of the orbit.
2. It opens into the middle meatus of nose at the anterior end of the hiatus
semilunaris either through the. Infundibulum or through the frontonasal duct.
3. The right and left sinuses are usually unequal in size; and rarely one or both may
be absent. Their average height, width and anteroposterior depth are each about 2.5
cm. The sinuses are better developed in males than in females.
4. They are rudimentary or absent at birth. They are well developed between 7 and 8
years of age, but reach full size only after puberty.
5. Arterial supply: Supraorbital artery.
Venous drainage: Into the supraorbital and superior ophthalmic veins.
Lymphatic drainage: To submandibular nodes.
Nerve supply: Supraorbital nerve.
ASSIGNMENT
ON
' PARANASAL AIR SINUS '
UNDER THE GUIDANCE OF:
DR. SWAPAN KUMAR HALDAR (PROF & H.O.D)
DR. ARINDAM PAL (LECTURER)
DEPT.- HUMAN ANATOMY.
PARANASAL SINUSES
DISSECTION
, Remove the thin medial walls of the ethmoidal air cells, and look for the continuity
with the mucous membrane of the nose. Remove the medial wall of maxillary air
sinus extending anteriorly from opening of nasolacrimal duct till the greater palatine
canal posteriorly. Now maxillary air sinus can be seen. Remove part of the roof of
maxillary air sinus so that the maxillary nerve and pterygopalatine ganglion are
identifiable in the pterygopalatine fossa. Trace the infraorbital nerve in infraorbital
canal in floor of orbit. Try to locate the sinuous course of anterior superior alveolar
nerve into the upper incisor teeth.
FEATURES
Paranasal sinuses are air filled spaces present within some bones around the nasal
cavities. The sinuses, are frontal, maxillary, sphenoidal and ethmoidal. All of them
open into the nasal cavity through its lateral wall. The function of the sinuses is to
make the skull lighter and add resonance to the voice. In infections of the sinuses or
sinusitis, the voice is altered. The sinuses are rudimentary, or even absent at birth.
They enlarge rapidly during the ages of 6 to 7 years, i.e. time of eruption of
permanent teeth and then after puberty. From birth to adult life, the growth of the
sinuses is due to enlargement of the bones; in old age it is due to due to surrounding
cancellous bones. The anatomy of individual sinuses is important as they are
frequently infanted.
FRONTAL SINUS
1. The frontal sinus lies in the frontal bone deep to the superciliary arch. It extends
upwards above the medial end of the eyebrow, and backwards into the medial part
of the roof of the orbit.
2. It opens into the middle meatus of nose at the anterior end of the hiatus
semilunaris either through the. Infundibulum or through the frontonasal duct.
3. The right and left sinuses are usually unequal in size; and rarely one or both may
be absent. Their average height, width and anteroposterior depth are each about 2.5
cm. The sinuses are better developed in males than in females.
4. They are rudimentary or absent at birth. They are well developed between 7 and 8
years of age, but reach full size only after puberty.
5. Arterial supply: Supraorbital artery.
Venous drainage: Into the supraorbital and superior ophthalmic veins.
Lymphatic drainage: To submandibular nodes.
Nerve supply: Supraorbital nerve.
