OTOLARYNGOLOGY DEPARTMENT OF OTORHINOLARYNGOLOGY OF LIAONING MEDICAL COLLEGE
- Slides: 46
OTOLARYNGOLOGY DEPARTMENT OF OTORHINOLARYNGOLOGY OF LIAONING MEDICAL COLLEGE CHEN DONG
Good morning everybody
Rhinolog y
Anatomy of Nose • External nose • Nasal cavity • paranasal sinuses
The external nose • The external nose is triangular-shaped projection in the center of the face, consists of osteocartilaginous framework covered by muscles and skin.
The external nose Landmark Root of nose Nasal dorsum Nasal bridge Nasolabial fold Alae nasi Nasal apex Anterior naris (nostril) columella
The external nose Framework(cartilaginous)
The external nose Framework(bony) frontal processes of the maxilla. Nasal bone pyriform aperture
BONE AND CARTILAGE OF NOSE
Nasal bone fractures are prevalent in sport, particularly in collision and contact sports.
DANGER TRIANGLE OF THE FACE Due to the special nature of the blood supply to the human nose and surrounding area, it is possible for retrograde infections from the nasal area to spread to the brain. For this reason, the area from the corners of the mouth to the region between the eyes, including the nose and maxilla, is known to doctors as the danger triangle of the face.
Vein of external nose Cavernous sinus Superior & inferior ophthalmic v. Facial v.
cavernous sinus
Nasal cavity • Nasal vestibule is the anterior and inferior part of nasal cavity. It is lined by skin and contains sebaceous glands, hair follicles and hair(vibrissae) easy to infection. • Nasal cavity proper Furuncle of nasal vestibule
Nasal cavity proper • The roof. Anterior sloping part of the roof is formed by nasal bones; Posterior sloping part by the body of sphenoid bone; and the middle horizontal part, by the cribriform plate of ethmoid.
Nasal cavity proper • The floor of the nose is formed by the palatal process of the maxilla and the horizontal process of the palate bones.
Nasal cavity proper • Medial wall. Nasal septum. vomer
STRCTURE OF NASAL SEPTUM
Septum deviation Result in- • Nasal obstruction • Nasal bleeding • Headache • Anosmia • Sinusitis • External deformity
Nasal cavity proper • Laterior wall. The lateral wall is marked by three scroll-like bone projections called turbinates or conchae. Below and lateral to each turbinate is the corresponding meatus.
Laterior wall of nasal cavity
Nasal cavity proper Laterior wall. l. Nasolacrimal duct opens in the anterior part of inferior meatus. l. The anterior group of sinuses (frontal, marxillary and anterior ethmoidal sinuses) open to the infundibulum in middle meatus. l. Posterior ethmoidal sinuses open into superior meatus. l. The openning of sphenoid sinus situate is phenoethmoidal recess lies above the superior turbinate.
Posterior naris (choanae) Nasal septum Inferior turbinate
Inferior turbinate
middle turbinate
rhinosinusitis
Ostiomeatal complex The ostiomeatal complex is the sinus "hot spot, " one of the most important anatomical regions with regard to sinus health and disease. That comprises maxillary sinus ostia, anterior ethmoid cells and their ostia, ethmoid infundibulum, hiatus semilunaris, and middle meatus.
Nasal cavities: Microanatomy Mucosal lining • Respiratory epithelium – – columnar goblet cells mucus blanket cilia • Olfactory epithelium – Small area near roof ciliated pseudostratified columnar epithelium
Nerve innervation of the nose • Olfactory nerves (cranial nerve I) • Trigeminal nerve (cranial nerve V) • Parasympathetics • Sympathetics
Blood supply of nasal cavity anterior ethmoidal a. posterior ethmoidal a. sphenopalatine a. iternal maxillary a. great palatine a.
Little plexus
paranasal sinuses The sinuses are air-filled bony cavities located in the face and skull adjacent to the nose.
paranasal sinuses • • Maxillary sinus Ethmoid sinus Frontal sinus Sphenoid sinus
Maxillary sinus The maxillary sinus is the largest one, present in the maxilla bone either side of nose and below the eyes. The sinus drains into the nasal cavity through its ostium that is situated in the middle meatus.
maxillary bone
maxillary bone
Ethmoid sinus This sinus comprises a group of air cells, which form one of the most complex structures in the body. Hence the sinus is rightly named the ethmoid ‘labyrinth’.
n ethmoid bone
Frontal sinus The frontal sinuses are situated beneath the bone of the forehead and just in front of the bone overlying the brain. And drains through the frontal recess to the middle meatus.
Sphenoid sinus The sphenoid sinuses are deep within the skull behind the ethmoid sinuses. The sinus opens in the upper part of anterior wall and drains into the sphenoethmoidal recess.
Sphenoid bone
sphenoid
sphenoid
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