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Occasionally an infected sinus will erode through its bony box into the cranium leading to a brain abscess. a rapid surfacing from depth, an ethmoidal sinus may rupture leading to facial subcutaneous emphysema.
Its multiple perforations allow entry of the olfactory nerve fibres into the nose.
With facial or head trauma the cribiform plate may fracture allowing leakage of cerebrospinal fluid into the nose (CSF rhinorrhea).
It is easily identified by its most prominent protuberance, the "Adam's Apple".
The thyroid cartilage acts as both an attachment for and protection to the vocal cords.
FIGURE 6: CARTILAGES OF THE LARYNX Epiglottis Hyoid Bone Thyrohyoid Ligament Thyroid Cartilage Arytenoid Cartilage Cricothyroid Ligament Cricothyroid Membrane Cricoid Cartilage First Tracheal Ring ___________________________________________________________________________ OBHG Education Subcommittee 9 Take a moment to palpate your own neck while referring to Figure 7 and reading the discussion which follows.
FIGURE 7: LATERAL ASPECT OF THE LARYNX Tongue Vallecula Epiglottis Thyrohyoid Ligament Hyoid Bone Thyroid Cartilage Attachment of Epiglottis Arytenoid Cartilage Vocal Ligament Cricothyroid Ligament Cricotracheal Ligament Cricoid Cartilage First Tracheal Ring Immediately below your chin you will find a horseshoe-shaped, mobile bone of 4-5 mm in width which moves superiorly when you swallow. Immediately below the hyoid bone is the thyroid cartilage.
This assessment cannot be done well without knowledge of the basic anatomy and function of the respiratory system.
The structure of the respiratory tract is closely correlated with its function.
The part behind the nose is the nasal pharynx (nasopharynx), behind the mouth is the oral pharynx (oropharynx) and behind the larynx is the laryngeal pharynx (laryngopharynx). Often air will leak out of the larynx leading to subcutaneous emphysema.
FIGURE 4: LATERAL ASPECT OF THE PHARYNX ___________________________________________________________________________ OBHG Education Subcommittee 7 When looking through the mouth into the oral pharynx one can see the soft palate, uvula and tonsils. The larynx extends from the hyoid bone to the lower border of the cricoid cartilage.