1-anatomy Of Nose 4o1364

OTOLARYNGOLOGY DEPARTMENT OF OTORHINOLARYNGOLOGY OF LIAONING MEDICAL COLLEGE

CHEN DONG

Good morning everybody

Rhinology

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 Anterior naris (nostril) Nasal apex

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 fracture Nasal bone fractures are prevalent in sport, particularly in collision and 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 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 . 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. Nasolacrimal

duct opens in the anterior

part of inferior meatus. The

anterior group of sinuses

(frontal,marxillary and anterior ethmoidal sinuses) open to the infundibulum in middle meatus. Posterior

ethmoidal sinuses open into

superior meatus. 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 one 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’.



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