Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Pharynx:
Pharynx is a funnel shaped tube about 13cm long that starts at the internal nares and extends to the level of the cricoid cartilage. It lies posterior to the nasal and oral cavities, superior to larynx and just anterior to the cervical vertebrae. Its walls are composed of skeletal muscles and lined by mucous membrane. Three parts of pharynx are nasopharynx, oropharynx and laryngopharynx. The nasopharynx is posterior to nasal cavity. The two internal nares, to eustachian tubes and the oropharynx are the openings of nasopharynx. Oropharynx lies posterior to oral cavity, extends from the soft palate inferiorly to the level of hyoid bone, lined with non-keratinized stratified squamous epithelium. Two pairs of tonsil are found in oropharynx. Laryngopharyx begins at the layer of hyoid bone, lined by non-keratinized stratified squamous epithelium, opens into oesophagus posteriorly and the larynx anteriorly. Pharynx serves as a passage way for air, food and drink, and provides resonating chamber for speech sounds.
Larynx:
Larynx or voice box is a short passage way that connects the laryngopharynx with trachea. It lies in the midline of the neck anterior to oesophagus and corresponds with the levels of cervical 4 to 6 vertebrae. Its wall is composed of nine pieces of cartilage-3 single-thyroid, epiglottis and cricoid and 3 in pairs- arytenoid, cuneiform and comiculate cartilages. Arytenoid influencerhe positions and tensions of vocal folds. Thyroid cartilage, two fused plates of hyaline cartilage to form the anterior wall of the larynx giving a triangular shape. Epiglottis is large, leaf shaped having a stem which is attached to the anterior rim of the thyroid cartilage and hyoid bone and a broad superior 'leaf' portion unattached and free to move up and down. During swallowing epiglottis moves down and forms a lid over glottis closing the entrance to larynx to prevent the entry of food or drink. When small particles of food, drink or dust enter the larynx a cough reflex occurs to expel the material.
Arytenoid cartilages are two small structures situated on the upper surface of the expanded signet portion of the cricoids cartilage. They give attachment to the posterior ends of the true vocal cords. The true vocal cords are fibro elastic bands extending from the posterior aspects of the thyroid cartilage in front to the arytenoids cartilage behind. The false vocal cords are two loose folds of mucous membrane situated above the true cords. Larynx is lined by mucous membrane which, except over the vocal cords, is covered with ciliated columnar epithelium.
Q. How are animals divided according to their kind of digestive process? At a distance from sponges that do not have a digestive cavity where extracellular digestion takes plac
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
A container is filled to a depth of 20.0 cm with water. On top of the water floats a 30.0-cm-thick layer of oil with specific gravity 0.700. What is the absolute pressure at the bo
A leaf is detached from a tree and tested with iodine. The leaf turns dark blue. (a) What does this result tell you? (b) Why is this result not sufficient e
Microorganisms and Plants can synthesize all of the 20 standard amino acids. Mammals, furthermore, cannot synthesize all 20 and must obtain some of them in their diet. Those amin
Carbohydrate characteristic chemical features include: Select one: a. the potential to form multiple hydrogen bonds. b. the existence of one or more asymmetric centers.
Who is the founder of theory survival of the fittest ?
It is defined as the total amount of heat produced, when unit mass/volume of the fuel has been burnt completely and the products have been cooled to room temperature (~ 15 0 C).
Q. Pathology of mitral regurgitation? During left ventricular systole as the pressure rises in left ventricle, blood is pumped simultaneously both into aorta and left atrium. T
Draw decanol, plamitic acid (C16:0 fatty acid) and the resulting wax ester generated by a dehydration reaction between both molecules.
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd