Regions of Larynx Flashcards
What regions of the Larynx are innervated by the INTERNAL branch of SUPERIOR Laryngeal n. (branch of CN X)?
- Inlet
- Vestibule
- Ventricle and Saccule
What structures/Spaces are present in the Laryngeal Inlet?
- Mucosa over the Epiglottis
- Aryepiglottic Fold
- Mucosa of Interarytenoid Notch
What structures/Spaces are present in the Vestibule of the Larynx?
- Mucosa over the Quadrangular membrane
2. Vestibular Fold
What structures/Space are present in the Ventricle and Saccule of the Larynx?
- Mucosa Lining the Ventricle Sacculus
What structures/Spaces are present in the Infraglottic space?
- Mucosa over the conus elasticus (BELOW the TRUE vocal folds)
What innervates the infraglottic space?
CN X via INFERIOR laryngeal n.
What is the Origin and Insertion of the Cricothyroid muscle?
Origin:
Anterior and Lateral Aspects of the Arch of the Cricoid Cartilage
Insertion:
Inferior Margin and Inferior horn of thryoid cartilage
What is the Origin and Insertion of the Posterior Cricoarytenoid?
Origin:
Posterior Surface of Lamina of Cricoid Cartilage
Insertion:
Muscular Process of Arytenoid Cartilage
What is the Origin and Insertion of the Lateral Crico-arytenoid muscle?
Origin:
Superior Border of Arch of Cricoid Cartilage
Insertion:
Muscular Process of Arytenoid Cartilage
What is the Origin and Insertion of the Thyroarytenoid muscle?
Origin:
Posterior surface of thyroid cartilage at midline angle
Insertion:
Anterolateral Border and vocal process of arytenoid cartilage
What is the Origin and Insertion of the Transverse and Oblique Artenoid Muscles?
Origin:
One Arytenoid Cartilage
Insertion:
Opposite arytenoid cartilage
What is the Origin and Insertion of the Vocalis Muscle?
Origin:
Vocal Process of Arytenoid Cartilage
Insertion:
Vocal Ligaments
What is the innervation of the Cricothyroid muscle?
EXTERNAL branch of SUPERIOR Laryngeal n.
What muscles of the Larynx are innervated by the Inferior Laryngeal N.?
- Posterior Cricoartenoid
- Lateral Cricoarytenoid
- Thryoartenoid
- Transverse and Oblique arytenoid
- Vocalis
What is the action and innervation of the vocalis muscle?
- Fine Tunes Tension of Vocal Ligament
- Affects PITCH of the voice
*Innervation = Inferior laryngeal n.
What is the action and innervation of the Transverse and obilque arytenoid m.?
- Closes intercartilaginous portion of rima glottidis
- IMPORTANT FOR COUGHING
*Innervation = Inferior Laryngeal n.
What is the action and innervation of the Thyroartenoid m.?
- Relaxes Vocal Fold
- LOWERS pitch of the voice
*Innervation = Inferior Laryngeal n.
What is the action and innervation of the Lateral Cricoarytenoid?
- ADducts vocal Fold
- CLOSES airway partially or completely depending upon the action of other muscles
*Innervation = Inferior Laryngeal n.
What is the action and innervation of the Posterior Cricoarytenoid?
- ABducts vocal Fold
- OPENS airway more to facilitate breathing
*Innervation = Inferiro Laryngeal n.
What is the action and innervation of the Cricothyroid Muscle?
- Stretches Vocal Fold
- RAISES Pitch of the voice
*Innervation = EXternal branch of SUPERIOR Laryngeal n.
What is the relationship between the action of the Cricothyroid and Thyroarytenoid Muscle?
*Opposing Effects on the Voice
- Cricothyroid: RAISES the pitch of the voice
- Thyroarytenoid: LOWERs the pitch of the voice
What is the relationship between the action of the Lateral and Posterior Cricoarytenoid Muscles?
- Opposing Effects on AIRWAY
Posterior Cricoarytenoid:
- ABducts Vocal fold to OPEN Airway
Lateral Arytenoid:
- ADducts Vocal Fold to CLOSE Airway (partially of completely)
What muscle is important when your are coughing?
- Transverse and Oblique Arytenoid
