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.
what arachnid is beneficial
Describe the events which lead to the formation of (a) identical twins, (b) fraternal twins in detail
Define Enrichment Media - Culture Media? It contains selective ingredients in the medium, which shifts the growth in a mixed microbial population to a particular group of micro
Long ago, there lived an Australopithecus girl by the name of Lucy. She died 3.2 million years ago. There are a few molecules of Lucy’s carbon in YOU! Starting from the gaseous C
Question 1 Write a short note on the following- Plasmids Retrotransposons Hfr Conjugation Generalized transduction Question 2 With the help of a neat diagra
I stored a few of my things from April to September this year. When I wanted to unpack the boxes, I found hundreds of round, small, black things. They look like they might be snail
Digestion in the Stomach To understand the digestion mechanism in the stomach, it is important to know about the anatomy of the stomach. Look up Unit 6, in the Applied Physio
Laws Governing Ocular Movements Hering's Law of Equal Innervation states that equal and simultaneous innervation flows from the brain to yoke muscles in all binocular movement
Types of Glials Cells and their Functions In the nervous tissue, besides the nerve cells there is one other cell type -the neuroglia which is present in large numbers and occu
Q. What is the cell cycle? The Cell cycle, or mitotic cycle, is the time period that begins when the cell is finishes and created when it is divided by mitosis creating two dau
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd