Elastic cartilage also contains a perichondrium, which covers the cartilage. Elastic cartilage or yellow cartilage is a type of cartilage present in the outer ear, Eustachian tube and epiglottis. Which of these cell types is not part of elastic cartilage? Elastic cartilage is histologically similar to hyaline cartilage but contains many yellow elastic fibers lying in a solid matrix. It contains elastic fiber networks and collagen type II fibers. The function of elastic cartilage, in this case, is therefore to spring back into a closed form upon the relaxation of this muscle, as such a narrow but important feature must be stable enough to retain its shape, and must be elastic enough to change it. The outer layer houses fibroblasts, which differentiate into chondrocytes as they progress towards the inner layer. The elastic fibers within the ECM of elastic cartilage are this tissue’s defining characteristic. Its main function is the equalization of middle ear pressure to the ambient atmospheric pressure. Where is its location? A clear distinction can be felt in the ear lobes, which have no cartilage, in comparison to the cartilaginous pinnae. In Outer Ear Elastic cartilage is one of three types of cartilage found in the human body. 8 Terms. The image below shows an epiglottis at rest. Elastic cartilage is the most flexible cartilage because it contains more elastin fibers. In humans it makes up the external ear, the auditory tube of the middle ear, and the epiglottis. In order to prevent food from entering the air passages of the human larynx and trachea, a thin, leaf-shaped flap of tissue, the epiglottis, closes the opening into the larynx during swallowing. Which attribute does elastic cartilage have? Cartilage: The three types of cartilage There are three types of cartilage: Hyaline - most common, found in the ribs, nose, larynx, trachea. Another important purpose of cartilage is to cover the surfaces of joints, allowing bones to slide over one another, thus reducing friction and preventing damage; it also acts as a shock absorber. The chains of glycosaminoglycan (GAG) that are part of the Aggrecan structure attract water and produce the lubricating and shock-absorbing qualities of cartilage. Elastic cartilage function is two-fold: to change cartilage shape in response to tension, compression, and bending before returning to an at-rest state, and to provide a strong but flexible structure. The effect of an imbalance in middle ear and atmospheric pressure is most readily experienced during the take-off and landing of an airplane. The outer ear is relatively unprotected and sticks out from the skull. I used to publish this type of article in regular basis in this site. Cartilage: elastic description. Elastic Cartilage can be found in the framework of the external ear and parts of the larynx. Approximately what percentage of elastic cartilage is cellular? The upper flap of the epiglottis covers the entrance to the esophagus, which lays posterior to the trachea. Chondrocytes within the cartilage only make up to 2% of total tissue volume. The other two types of cartilage – hyaline and fibrous – are white in appearance. Hope, you have got the basic idea about cartilage histology along with hyaline cartilage histology, hyaline cartilage function, cartilage function, cartilage ppt, elastic cartilage histology, fibrocartilage histology, costal cartilage histology and others. This is the type of cartilage found in your ear. It is found in the epiglottis (part of the larynx), the pinnae (the external ear flaps of many mammals). If the outer ear was fleshy, the folds of the pinna which modify sound waves before funneling them through to the middle ear would not keep their form and work less efficiently. Fibro- is found in invertebral discs, joint capsules, ligaments. This type of cartilage is typically found in their auricle of the ear and the epiglottis. Elastic cartilage function is two-fold: to change cartilage shape in response to tension, compression, and bending before returning to an at-rest state, and to provide a strong but flexible structure. Elastic cartilage, sometimes referred to as yellow fibrocartilage, is a type of cartilage that provides both strength and elasticity to certain parts of the body, such as the ears. Elastic cartilage looks very similar to hyaline cartilage under a microscope, and special stains must be used to show the otherwise invisible elastic fibers that give this particular cartilage type its name. Collagen fibers are found in all types of cartilage, unlike elastic fibers, and are found in high quantities. The chondrocytes lie between the fibres. Elastic cartilage in the epiglottis is important as it maintains the form of this valve-like appendage and always springs back into the at-rest position, allowing for the body’s most important process – breathing. My voice turned hoarse after the game, but when I woke up in the morning, it was completely gone. The main function of elastic cartilage is to provide strength and elasticity to a structure while maintaining the shape. Chondrocyte in lacuna and matrix- white ball eye and sometimes…. This allows the cartilage to spring back into the original position (into a relaxed state). This osmotic effect produces a flexible but firm gel. Whenever locomotion is discussed, the default anatomical components that are addressed are usually bones, muscles, and ligaments.However, there are other supporting structures that contribute to the tenacity of the musculoskeletal system that is crucial for optimum functionality. The elastic cartilage of the larynx helps move the vocal cords so we can make sounds. Costal cartilages that connect the ventral ends of the ribs to the sternum increases elasticity of the chest wall maintains the shape of a structure while allowing great flexib…. These chondrocytes are surrounded by the extracellular matrix crisscrossed by a darker, fibrous network of collagen and elastin fibers. Collagen fibers are also found within the perichondrium; the outer layer is more collagen-rich. When you have inflamed vocal cords, though, even the cartilage can't help you get a word out. Chondrocytes and ECM are contained within an outer layer known as a perichondrium. The perichondrium is made up of two differently functioning layers: the inner layer contains chondroblasts (chondrocytes which are not yet fixed within the extracellular matrix, and which continue to produce the components of this thick gel-like substance). Elastic cartilage, which is yellow in appearance, is more pliable than the other two forms because it contains elastic fibres in addition to collagen. Elastic or yellow fibers are composed of elastin proteins which co-polymerize with another protein type – fibrillin – forming fiber-like elastic chains. Functions of Elastic Cartilage- Change of Shape and Size- The ear lobe often gets pinched during sleep under pressure. The ECM of elastic cartilage contains elastin, fibrillin, glycoproteins, collagen types II, IX, X and XI, and (predominantly) the proteoglycan Aggrecan. The aneural and avascular properties of cartilage mean that it is unlikely that one is woken up if the ear is folded when being slept on. On either side of the cartilage are the paler perichondrial layers. There is no type I collagen in elastic cartilage. These fibers give elastic cartilage great flexibility so that it is able to withstand repeated bending. Fun Fact! These components are produced by the chondroblasts at the inner edges of the perichondrium, and are located in an environment that is gel-like. Elastic cartilage function is two-fold: to change cartilage shape in response to tension, compression, and bending before returning to an at-rest state, and to provide a strong but flexible structure. ; Elastic - is found in the external ear, epiglottis and larynx. Biologydictionary.net, April 26, 2019. https://biologydictionary.net/elastic-cartilage/. Support - Elastic cartilage also strengthens and supports these structures. Preventing rubbing of bones against each other is one of the main cartilage functions. It is usually recognizable by its dull yellow color. Like hyaline, elastic cartilage also has single or multiple chondrocytes housed within spaces called lacunae. Forms the epiglottis : covers the opening of trachea when swallowing. I had laryngitis after yelling during a ballgame the previous night. The Extracellular Matrix of Elastic Cartilage, Ability to spring back into an original position, and to provide a shock-absorbent, low friction environment, Ability to convert chondroblasts into fibroblasts. To form yellow fibers, elastin proteins co-polymerize with: 5. Elastic cartilage is also found in the corniculate and cuneiform cartilages of the larynx, where the joints they create allow for the movement of the vocal chords and play a role in voice quality and pitch. Elastin fibers stain dark purple/black with Verhoeff's stain. These fibers form bundles that appear dark under a microscope. Swallowing during take-off or landing often causes the ears to ‘pop’. The extracellular matrix of all types of cartilage binds with water (osmotic effect) due to the action of Aggrecan, the predominant proteoglycan of cartilage. Function #1. The shape returns to normal shape when pressure is removed. This action prevents saliva and food from entering the airway, where choking and aspiration pneumonia may be the result. The above image, multiplied in size by 100, clearly shows one, two, and very rarely three chondrocytes within a single lacuna inside the elastic cartilage. The other prominent anatomical sites composed of elastic cartilage are the epiglottis, Eustachian tube, and corniculate and cuneiform cartilages of the larynx. The chondrocytes lie between the fibres. Hence, this cartilage can be found in the ear, epiglottis, and larynx. When swallowing, the flap of the epiglottis moves forward, closing the entrance to the airway and revealing that of the esophagus. Other articles where Elastic cartilage is discussed: cartilage: Elastic cartilage, which is yellow in appearance, is more pliable than the other two forms because it contains elastic fibres in addition to collagen. Is a precursor of bone. similar to hyaline cartilage, but more elastic fibers in matrix. Elastic cartilage, also known as yellow cartilage, is made up of networks of elastic and collagen fibers of which the principal proteins are elastin. At rest, the epiglottis is upright. Its role is to give shape and support to these areas. The white vocal chords of the larynx can be seen at the edges of the dark hole of the trachea. 2. They give elastic cartilage great flexibility so it can withstand repeated bending. These fibers give elastic cartilage great flexibility so that it is able to withstand repeated bending. Elastic cartilage locations are varied. It is more flexible than hyaline cartilage. Cartilage is a resilient and smooth elastic tissue, a rubber-like padding that covers and protects the ends of long bones at the joints and nerves, and is a structural component of the rib cage, the ear, the nose, the bronchial tubes, the intervertebral discs, and many other body components. 3. The extracellular matrix of elastic cartilage contains higher levels of type II collagen. Chondrocytes lie between the fibers. Hyaline Cartilage. Function #2. Elastic Cartilage. elastic cartilage n. A yellowish flexible cartilage in which the matrix is infiltrated by a network of elastic fibers; it occurs primarily in the external ear, eustachian tube, and some cartilages of the larynx and … Its role is to give shape and support to these areas. Within the outer ear , it provides the skeletal basis of the pinna, as well as the lateral region of … Elastic cartilage is the most flexible, which means it contains the most chondrocytes. In this case, elastic cartilage has a protective and structural function. High levels of yellow (elastic) fibers in matrix ; most flexible cartilage. “Elastic Cartilage.”, Biologydictionary.net Editors. Function: The main purpose of cartilage is to provide a framework on which bone deposition may begin. Should a person swallow, the epiglottis is pulled back and covers the opening into the larynx which lies in front of the opening into the esophagus. Elastic cartilage is sometimes confusingly referred to as fibroelastic cartilage (this is confusing because there is another type of cartilage called fibrocartilage). Elastic . When relaxed, these chains are disorganized. Know more about its structure and work, along with the a variety of cartilage connective tissue we now have in the body. Cartilage – Introduction, Structure, Formation And Types Of Cartilage 8 months ago Drishti Sharma Introduction Cartilage is a connective tissue found in various parts of the adult skeleton including… A form of connective tissue, elastic cartilage is also recognized by its ability to snap back into an original form – or resting form – due to the addition of elastin fibers to the extracellular matrix. The collagen fibers similarly form a network which provides strength and a structural framework for other molecules within the ECM. Its matrix has many elastic fibers in addition to type II collagen. Elastic cartilage is histologically similar to hyaline cartilage but Allows Vibration- The cartilage of larynx (voice box) vibrates during speech and singing. “Elastic Cartilage.” Biology Dictionary. This effect can also be achieved through nose blowing or yawning, as during these actions the Eustachian tube opens and allows air to enter into the middle ear, reducing the difference between middle ear and atmospheric pressures. During this move and accompanying differentiation, fibroblasts stop secreting type I collagen and hyaluronic acid and start to secrete type II collagen and chondroitin sulfate as they change into chondroblasts. Elastic fibers; Description: This cartilage is similar to hyaline cartilage, but it contains many more elastic fibers [3]. 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