Dr. Sami Zaqout Faculty of Medicine IUG
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1
2 The Nose External Nose Nasal Cavity
3 External Nose
4 Blood and Nerve Supplies of the External Nose Blood Supply of the External Nose The skin of the external nose Branches of the ophthalmic and the maxillary arteries The skin of the ala and the lower part of the septum Branches from the facial artery Nerve Supply of the External Nose The infratrochlear and external nasal branches of the ophthalmic nerve The infraorbital branch of the maxillary nerve
5 Nasal Cavity
6 Nasal Cavity
7 Choanae
8 Nasal Cavity - Floor
9 Nasal Cavity - Roof
10 Nasal Cavity - Lateral Wall
11 Nasal Cavity - Lateral Wall
12 Nasal Cavity - Medial Wall
13 Ethmoid bone
14 Ethmoid bone
15 Mucous Membrane of the Nasal Cavity The vestibule is lined with modified skin and has coarse hairs. The area above the superior concha is lined with olfactory mucous membrane. The lower part of the nasal cavity is lined with respiratory mucous membrane.
16 Function of Warm Blood and Mucus of Mucous Membrane The presence of warm blood in the venous plexuses serves to heat up the inspired air as it enters the respiratory system. The presence of mucus on the surfaces of the conchae traps foreign particles and organisms in the inspired air.
17 Nerve Supply of the Nasal Cavity.
18 Arterial Supply to the Nasal Cavity
19 Venous drainage of the nasal cavities
20 Lymphatic drainage of the nasal cavities
21 Examination of the Nasal Cavity It should be remembered that the nasal septum is rarely situated in the midline. A severely deviated septum may interfere with drainage of the nose and the paranasal sinuses.
22 Trauma to the Nose Fractures involving the nasal bones are common. Blows directed from the front may cause one or both nasal bones to be displaced downward and inward. Lateral fractures also occur in which one nasal bone is driven inward and the other outward; the nasal septum is usually involved.
23 Infection of the Nasal Cavity Organisms may spread via the nasal part of the pharynx and the auditory tube to the middle ear. It is possible for organisms to ascend to the meninges of the anterior cranial fossa, along the sheaths of the olfactory nerves through the cribriform plate, and produce meningitis.
24 Foreign Bodies in the Nose Foreign bodies in the nose are common in children. The presence of the nasal septum and the existence of the folded, shelflike conchae make impaction and retention of balloons, peas, and small toys relatively easy.
25 Nose Bleeding - Epistaxis The most common cause is nose picking. The bleeding may be arterial or venous, and most episodes occur on the anteroinferior portion of the septum and involve the septal branches of the sphenopalatine and facial vessels.
26 The Paranasal Sinuses
27 Functions of Paranasal Sinuses Act as resonators to the voice Reduce the weight of the skull
28 Maxillary Sinus The maxillary sinus is pyramidal in shape and located within the body of the maxilla behind the skin of the cheek. The roof is formed by the floor of the orbit The floor is related to the roots of the premolars and molar teeth.
29 Frontal Sinuses The two frontal sinuses are contained within the frontal bone. They are separated from each other by a bony septum. Each sinus is roughly triangular, extending upward above the medial end of the eyebrow and backward into the medial part of the roof of the orbit.
30 Sphenoidal Sinuses The two sphenoidal sinuses lie within the body of the sphenoid bone
31 Ethmoid Sinuses The ethmoidal sinuses are anterior, middle, and posterior and they are contained within the ethmoid bone, between the nose and the orbit. They are separated from the latter by a thin plate of bone so that infection can readily spread from the sinuses into the orbit.
32 Paranasal Sinuses and Their Site of Drainage Into the Nosea
33 Sinusitis
34 Sinusitis The frontal sinus is innervated by the supraorbital nerve, which also supplies the skin of the forehead and scalp as far back as the vertex. The maxillary sinus is innervated by the infraorbital nerve and, in this case, pain is referred to the upper jaw, including the teeth.
35 Examination of the Paranasal Sinuses
36 Transillumination - Radiologic examination
37
38 The Larynx Protective sphincter at the inlet of the air passages. Responsible for voice production. Lies at the level of the fourth, fifth, and sixth cervical vertebrae.
39 Larynx
40 Cartilages of the Larynx Thyroid cartilage Cricoid cartilage Arytenoid cartilages Corniculate cartilages Cuneiform cartilages Epiglottis
41 Thyroid cartilage
42 Cricoid cartilage
43 Arytenoid cartilages
44 Corniculate and cuneiform cartilages
45 Epiglottis
46 Epiglottis
47 Membranes and Ligaments of the Larynx Thyrohyoid membrane Cricotracheal ligament Quadrangular membrane Cricothyroid ligament
48 Thyrohyoid membrane + Cricotracheal ligament
49 Quadrangular membrane
50 Cricothyroid ligament.
51 Inlet + Cavity of the Larynx
52 Vestibular Fold The vestibular fold is a fixed fold on each side of the larynx. It is formed by mucous membrane covering the vestibular ligament and is vascular and pink in color.
53 Vocal Fold (Vocal Cord) The vocal fold is a mobile fold on each side of the larynx and is concerned with voice production. It is formed by mucous membrane covering the vocal ligament and is avascular and white in color.
54 Vocal Fold (Vocal Cord) The gap between the vocal folds is called the rima glottidis or glottis. The glottis is bounded in front by the vocal folds and behind by the medial surface of the arytenoid cartilages. The glottis is the narrowest part of the larynx and measures about 2.5 cm from front to back in the male adult and less in the female.
55 In children the lower part of the larynx within the cricoid cartilage is the narrowest part
56 Laryngeal Cavity - Laryngoscope
57
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