This document provides information on the sinuses, including the maxillary, ethmoid, sphenoid, and frontal sinuses. For each sinus, it summarizes the boundaries, relations, openings, arterial supply, venous drainage, nerve supply, and lymphatic drainage in bullet point form.

1. S NAME BOUNDARIES RELATIONS OPENING ARTERIAL VENOUS NERVE LYMPHATIC
r OF OSTIUM SUPPLY
. SUPPLY DRAINAGE DRAINAGE
n
o
1 Maxillary -Pyramadil in shape POSTERIORLY: -2-4mm in Facial Facial vein MAXILLARY Submandibular
Pterygopalatine& diameter BRANCHES:
-APEX: In zygomatic Infratemporal Maxillary Pterygoid
process of maxilla fossa -Post. part plexus -Infraorbital
of Infraorbital
-BASE: in Lateral ANTERIORLY: infundibulu -Superior
Greater alveolar(Ant
wall of nose Cheek m in the palatine . Post.
ROOF: Floor of middle
ROOF& ANT. Middle)
orbit meatus
WALL: Indented
FLOOR: Alveolar by the passage of
process of maxilla infraorbital
nerve.
2 Ethmoidal -Lies in the Supraorbital Supraorbital Submandibular
. sinus ethmiodal
labyrinth Ant.ethmoidal Ant.ethmoid Retropharyngeal
al
LATERAL WALL: Post.Ethmoida
Lamina l Post.Ethmoi
papyracea(Paper- dal
Sphenopalatin
thin plate)-Medial e artery Lateral post.
wall of orbit nasal
MEDIAL WALL: Orbital
Lateral nasal wall twigs from
ROOF: Orbital part pterygopala
tine
of frontal bone
ganglion
Ant.ethm Infundibulu Submandibular
oidal m in the
sinus middle Retropharyngeal
meatus

2. Middle Project in a Middle
convexity in the meatus
Ethmoidal lateral nasal wall
sinus beneath the middle
nasal concha as
”ETHMOIDAL
BULLA”
Posterior Superior
Ethmoidal Meatus
sinus
3 Sphenoid -Lies in the body of SUPERIORLY: Sphenoeth Post.ethmoida Post. Retropharyngeal
. al sinus sphenoid Pituitary fossa& moidal l artery ethmoidal
Mid. Cranial recess nerve
fossa
INFERIORLY:
Nasopharynx
LATERALLY:
Cavernous
sinus& Int.
carotid artery
POSTERIORLY:
Post.cranial
fossa& PONS
4 Frontal -Only sinus not SUPERIORLY: Frontonasa Supraorbital Sup. Supraorbital Submandibular
. sinus present at birth Ant.cranial fossa l recess Ophthalmic nerve
Ant. vein
-Excavations INFERIORLY: ethmoidal
between outer&
inner tables of skull Orbital cavity
-Lie in sq. part &
orbital part of
frontal bone
REFRENCE: Last’s Anatomy