Nasal bone

The nasal bones are small paired oblong upper central Gross anatomy The nasal bone has two surfaces: • external surface to which the • internal, which is transversely concave, with a groove, the ethmoid sulcus, for the The four borders of the roughly quadrangular nasal bone are: • superior: joins the frontal bone at the • inferior: free edge, continues as the • lateral: articulates with the frontal process of the maxilla at the • medial: with a Attachments • musculotendinous • • Ossification The nasal bones ossify from a single center which appears early in the third month within the cartilaginous nasal capsule, which can be assessed during the 12 th-week prenatal scan for nasal bone appearance. Its absence is associated with

At the top of the nasal bones, along the nasofrontal sutures, the nasal bones meet the frontal bone of your skull. This point is referred to as the nasion. The rhinion is where the bony vault meets the cartilaginous vault, which is on the opposite side of the nasal bones (towards the tip of your nose). This is the area of your nose that has the thinnest amount of skin on your nose. SCIENCE PHOTO LIBRARY / Getty Images Function The bony vault has many important protective functions. The nasal bones form the roof, while the frontal process of the maxilla and lacrimal bone forms the sides of the nose. Where the maxilla and lacrimal bones connect, the lacrimal groove is formed. This groove is where the • Examine your nose to assess if it has remained straight (if there is a C-shaped appearance, then you likely have a deviated septum) • Examine your nose by feeling (palpating) the different parts of the nose including the nasal bones • Inspect the interior of your nose using a nasal speculum, which is a small clamp-like instrument to open up your nares for easier visualization. If you are seeing an • Your healthcare provider still may want some radiographic images. In most instances X-ray images will not provide enough useful information; a CT scan is most helpful in ruling out other facial fractures. If fracturing of the nasal bones and surrounding tissue is minimal and breathing is unaffected, then observation is typically the recommendation. If your nasal bones are more frac...

Your nose is part of your respiratory system. It allows air to enter your body, then filters debris and warms and moistens the air. Your nose gives you a sense of smell and helps shape your appearance. Many common symptoms affect your nose, such as a stuffy nose and nosebleed. Other symptoms may need treatment to keep your nose functioning well. Function What is the function of your nose? Your nose is involved in several important bodily functions: • Allows air to enter your body. • Contributes to how you look and how you sound when you speak. • Filters and cleans air to remove particles and allergens. • Provides a sense of smell. • Warms and moistens air so it can move comfortably into your respiratory system. Your nose is also a prominent aspect of your facial appearance and your sense of well-being. Anatomy What are the parts of your nose? Your nose anatomy includes: • Bone: The hard bridge at the top of your nose is made of bone. • Hair and cilia: Hair and cilia (tiny, hairlike structures) inside your nose trap dirt and particles. Then they move those particles toward your nostrils, where they can be sneezed out or wiped away. • Lateral walls (outer walls): The outer walls of your nose are made of cartilage and covered in skin. The walls form your nasal cavities and your nostrils. • Nasal cavities: Your nose has two nasal cavities, hollow spaces where air flows in and out. They are lined with mucous membranes. • Nerve cells: These cells communicate with your brain to p...

Article: • • • • • Images: • Radiographic assessment Antenatal ultrasound It is assessed on a midline sagittal view. In this section, the nasal bone is often seen as a bright echogenic line. It is best visualized at around 11 th to 14 th weeks of gestation (1 st trimester). A magnified image may assist in visualization. When the mid-sagittal view is difficult to assess, some authors suggest a coronal view of the fetal face to look for paired echogenic structures located at the upper tip of the retronasal triangle 6. Significance When the nasal bone is absent at 11 to 12 weeks, while the other ultrasound markers and serum biochemistry are normal; a follow-up scan after a week is suggested. The incidence of an absent nasal bone is related to The reported prevalence range of an absent nasal bone on ultrasound for euploid as well as the following aneuploidy states are • euploid: nasal bone absent in 0.5-3% 1 • 1-3 • 1,3 • 1,3 • 3

The nasal cavity consists of all the bones, tissues, blood vessels and nerves that make up the interior portion of the nose. The most important functions of the nasal cavity include warming and humidifying the air as you breathe and acting as a barrier for the immune system to keep harmful microbes from entering the body. roccomontoya / DigitalVision Vectors / Getty Images Anatomy The inside of the nose, including the bones, cartilage and other tissue, blood vessels and nerves, all the way back posteriorly to the nasopharynx, is called the nasal cavity. It is considered part of the upper respiratory tract due to its involvement in both inspiration and exhalation. Immunity Cilia on the cells of the tissue lining the nasal cavity combined with mucus (from the goblet cells) have a combined role in filtering the air that we breathe. Small particles and germs are trapped in the nasal cavity by the mucus and the cilia works to sweep the mucus out of the passageways. Tests When evaluating the nasal cavity and associated conditions your healthcare provider may use several tests. Sometimes the inferior portion of the nasal cavity can be visualized simply using a light. If more visualization is needed an endoscope may be used or medical imaging tests may be helpful such as a computed tomography (CT) scan.

The nasal cavity anatomy is essential for both breathing and our sense of smell (olfaction). But did you know that 80% of taste actually comes from what we smell? That is why food is almost tasteless when our nose is clogged. The nose is the most prominent part of the human face. It has internal and external parts. If you’re in show business, the appearance of the external part is certainly very important. However besides esthetics, the external nose also functions to protect the inner nose and allows the entry of air. The internal part of the nose is termed the Key facts about the anatomy of the nasal cavity External nose The external part of the nose consists of a root (superiorly), apex (inferiorly), dorsum, nares (nostrils) and the separating nasal septum. Bony component: nasal, maxillae and frontal bones Cartilaginous component: alar cartilages (major, minor), lateral processes, septal cartilage Nasal cavity Bones: nasal, maxilla, sphenod, vomer, palatine, lacrimal, ethmoid ( mnemonic: Nerdy Medical Students are often Very Pa LE) Apertures: nares, nasal conchae (superior, middle, inferior) Channels: inferior nasal meatus, middle nasal meatus, superior nasal meatus, sphenoethmoidal recess Regions: vestibule, respiratory region, olfactory region Blood supply External carotid artery and its branches: sphenopalatine, greater palatine, superior labial and lateral nasal arteries Internal carotid artery and its branches: anterior and posterior ethmoidal arteries Nerve...

• 1 Divisions • 2 Nasal Conchae • 3 Openings into the Nasal Cavity • 3.1 Clinical Relevance: Spread of Infection • 4 Gateways to the Nasal Cavity • 5 Vasculature • 5.1 Clinical Relevance: Epistaxis • 6 Innervation • 6.1 Clinical Relevance: Cribriform Plate Fracture The nose is an olfactory and respiratory organ. It consists of nasal skeleton, which houses the nasal cavity. The nasal cavity has four functions: • Warms and humidifies the inspired air. • Removes and traps pathogens and particulate matter from the inspired air. • Responsible for sense of smell. • Drains and clears the paranasal sinuses and lacrimal ducts. In this article, we shall look at the anatomy of the nasal cavity – its divisions, structure and neurovascular supply. Divisions The nasal cavity is the most superior part of the respiratory tract. It extends from the vestibule of the nose to the nasopharynx, and has three divisions: • Vestibule – the area surrounding the anterior external opening to the nasal cavity. • Respiratory region – lined by a ciliated psudeostratified epithelium, interspersed with mucus-secreting goblet cells. • Olfactory region – located at the apex of the nasal cavity. It is lined by olfactory cells with olfactory receptors. Nasal Conchae Projecting out of the lateral walls of the nasal cavity are curved shelves of bone. They are called conchae (or turbinates). The are three conchae – inferior, middle and superior. They project into the nasal cavity, creating four pathways for the ...