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Thieme: Ear, Nose, and Throat Diseases 116 2 Nose, Nasal Sinuses, and Face Applied Anatomy and Physiology in typical fractures of the nasal bones, but it may also be fractured in injuries to the central part of the face. The cartilaginous inferior portion is less at risk, ■ Basic Anatomy at least in mild blunt trauma, because of its elastic structure, but it is endangered in stab wounds, ■ External Nose lacerations, and gunshot injuries. The shape, posi- The supporting structure of the nose consists of tion, and properties of the bone and cartilage of the bone, cartilage, and connective tissue. Figure 2.1 nose have a considerable influence on the shape shows the most important elements. The bony and esthetic harmony of the face (see p. 212)and superior part of the nasal pyramid is often broken on the function of the nasal cavity. Fig. 2.1 The nasal skeleton. 1, Glabella; 2, nasal bone; 3, lateral nasal cartilage; 4, cartilaginous nasal septum; 5, alar cartilage with lateral (a) and medial crus (b); 6, nasal valve between the cranial alar and caudal lateral cartilages. R, Rhinion. The bony portion of the nose is completely rigid. The flexible cartilaginous por- tion begins at the rhinion. The distal caudal lateral cartilages can move like the wings of a butterfly, whereas the alar cartilages move more like the wings of a bird. The nasal sep- tum is the center of stability. aus: Behrbohm u. a., Ear, Nose, and Throat Diseases (ISBN 9783136712030) © 2009 Georg Thieme Verlag KG Applied Anatomy and Physiology 117 The following blood vessels in the external nose lower lateral or alar cartilage, the medial crus of which are of practical importance: extends into the columella and the lateral crus of which ● Facial artery and its branches. supports the external wall of the vestibule (Figs. 2.1, 2.3a, ● Dorsal nasal artery, arising from the ophthalmic b). The alar cartilage determines the shape of the nasal tip artery. and the nasal apertures. Correcting this area is often an important part of rhinoplasty. Profuse hemorrhage can arise from these vessels when the central part of the face is injured. The angular vein is also clinically important. 9 Thrombophlebitis arising from a furuncle of the upper lip or the nose can spread via the ophthalmic vein to the cavernous sinus, causing a cavernous sinus thrombosis (see p. 189 and Fig. 2.2). The external nose derives its sensory nerve sup- 8 ply from the first and second branches of the tri- geminal nerve (see Fig. 2.15a, b). The muscles de- 10 rive their motor nerve supply from the facial nerve. 11a 1 11b ■ Nasal Cavity The interior of the nose is divided by the nasal septum into two cavities, which are usually unequal 6 7 2 in size. Each side may be divided into the nasal 3 vestibule and the nasal cavity proper (Fig. 2.3a, b). The nasal vestibule is covered by epidermis con- taining hairs (vibrissae)and sebaceous glands. The 5 4 latter are the site of origin of a nasal furuncle, which can thus only develop in the nasal cavity in the vestibule. Fig. 2.2 Important vascular relationships in the face. 1, Site for ligation of the angular vein; 2, facial artery; 3, facial vein; The medial wall of the nasal vestibule encloses the sup- 4, common carotid artery; 5, internal jugular vein; 6, pter- porting structure of the anterior part of the cartilaginous ygoid plexus; 7, sigmoid sinus; 8, inferior sagittal sinus; septum and the membranous septum—i. e., the columella. 9, superior sagittal sinus; 10, cavernous sinus; 11a, superior The roof of the vestibule is formed by the bird wing–shaped petrosal sinus; 11b, inferior petrosal sinus. Fig. 2.3a, b a Section through the anterior nose, showing the 10 vestibule and the limen nasi. The dashed line in b shows the sec- 1 tional plane of a. The limen nasi is 1 9 located at the junction of the pink and red areas. 3 2 b Medial nasal wall. 1, Bony nasal 4 2 bridge; 2, nasal septum; 3 3, upper lateral nasal cartilage; 5 4, nasal cavity; 5, alar cartilage; 5 6, nasal vestibule; 7, nasal ala; 8, nasal columella with medial crus of the cartilaginous ala; 9, filaments of the olfactory nerve; 10, olfactory bulb; 11, palatine bone; 12, perpendic- a 7 8 6 b 11 12 13 14 ular plate of the ethmoid; 13, vomer; 14, pharyngeal eusta- chian tube ostium. aus: Behrbohm u. a., Ear, Nose, and Throat Diseases (ISBN 9783136712030) © 2009 Georg Thieme Verlag KG 118 2 Nose, Nasal Sinuses, and Face Fig. 2.4 Lateral nasal wall. I, 6 7 5 8 Superior meatus; II, middle meatus; III, inferior meatus. 1, Nasal vestibule; 2, opening of the nasolacrimal duct; 3, origin of the inferior turbinate; 4, semilunar hiatus; 5, insertion of the middle turbinate; I 6, sphenoid sinus; 7, insertion of f the superior turbinate; 8, frontal e sinus. a, Drainage of the antral c b cavity; b, drainage of the frontal 4 II sinus; c, drainage of the anterior d ethmoid cells; d, drainage of the posterior ethmoid cells; 3 a III e, drainage of the sphenoid sinus; f, area of infundibulum 2 (dotted area). 1 The internal nasal valve or limen nasi is a very ● Opening of the nasolacrimal duct into the infe- important structure from the physiologic point of rior meatus view. It lies at the junction of the vestibule and the nasal cavity. It is formed by a prominence of the The superior, middle, and inferior meatus are lo- anterior edge of the upper lateral or triangular car- cated inferior to the three turbinates (Fig. 2.4); the tilage on the lateral wall of the nose (Fig. 2.3a). The paranasal sinuses and the nasolacrimal duct open internal nasal valve is normally the narrowest point into them. These openings are of diagnostic and in the entire cross-section of the nasal cavity, mak- therapeutic importance. ing it an important factor in nasal respiration (see p. ● The inferior meatus, located between the floor of 135). the nose and the insertion of the lower turbinate, The nasal cavity extends from the internal nasal lacks a sinus ostium, but contains the opening of valve to the choana. The structure of the floor and the nasolacrimal duct ≈ 3 cm posterior to the roof of the nose, the medial wall, and the nasal external nasal opening and 3 mm posterior to septum is shown in Fig. 2.3a, b. the head of the inferior turbinate (Fig. 2.4). The outline of the lateral wall of the nasal cavity ● The middle meatus, between the inferior and is more complex than that of the medial wall. It middle turbinate, is of clinical importance be- contains several structures that are important in cause the frontal recess, the anterior ethmoid the functioning of the nose and nasal cavity (Fig. cells, and the maxillary antrum open into it 2.4): (Fig. 2.4). ● Three nasal turbinates (superior, middle, and ● The superior meatus, between the middle and inferior) superior turbinate, contains the opening for the ● Drainage of the paranasal sinuses (frontal sinus posterior ethmoid cells. The sphenoid ostium is and maxillary sinus through the hiatus semilu- located on the anterior wall of the sphenoid si- naris in the middle meatus, located between the nus, at the level of the superior meatus (Fig. 2.4). inferior and middle turbinate; the sphenoid si- nus has an ostium of its own in the sphenoeth- moidal recess) aus: Behrbohm u. a., Ear, Nose, and Throat Diseases (ISBN 9783136712030) © 2009 Georg Thieme Verlag KG Applied Anatomy and Physiology 119 Fig. 2.5a–daFrontal section 5 through the nasal cavity. The nasal mucosa is constricted on 2 the left side and normal on the right. b Respiratory mucosa. 1, Middle 1 6 turbinate; 2, antrum with os- 7 tium; 3, nasal septum; 4, inferior turbinate; 5, layer of mucus; 3 8 6, respiratory epithelium with 4 cilia; 7, goblet cells; 8, mucosal glands. c Sagittal section through the nose with the septum reflected a b superiorly. 1, Olfactory region; 2, middle turbinate; 3, inferior turbinate. d1, Scent molecules dock onto 1 receptors; 2, bipolar nerve cells; 3 3, olfactory bulb with 4, glo- 1 5 4 merulus (microcenter) and 5, mitral cells. 2 3 2 1 c d Fig. 2.6a, b a 1, Scent mole- cules, 2, scent receptors. Each olfactory cell bears only a single type of receptor. There are 350 types of receptor in humans. A receptor can recognize up to 1 100 structurally similar mole- cules in a scent category. b Scent molecules only fit one 1 specific receptor. They trigger a 2 biochemical reaction and a sub- 2 sequent electrical signal, which is transmitted to the olfactory center in the brain. a b The nasal cavity is lined by two types of epithelium: respira- the nasal cavity. The epithelium is columnar-ciliated with tory and olfactory (Figs. 2.5a–d, 2.6a, b). Respiratory epithe- goblet cells and a layer of mixed glands, a fairly well demar- lium coats the entire airway and its projections and exten- cated lymphoid cell zone and well developed venous caver- sions (e. g., the paranasal sinuses and the middle ear), from nous spaces in the turbinates and around the ostia (Fig. the nasal introitus to the bronchi. It shows morphologic 2.5a). variation in different parts of the respiratory tract. Figure The olfactory mucosa, innervated by fibers of the olfac- 2.5c, d shows the structure of the respiratory epithelium of tory nerve, covers the area of the olfactory cleft, the cribri- aus: Behrbohm u.
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