Extrinsic Muscles-Suprahyoid
Has 2 bellies linked by a tendon. It assists with elevating the Hyoid. Origin is the medial surface of the Mastoid process of the temporal bone. Insertion is the lower border of the mandible. It is tethered to the hyoid by connective tissue. Action is aiding in the elevation of the hyoid
What is the Digastric Muscle?
Thin muscle that appears to be a continuation of the sternohyoid muscle. Origin: oblique line of the thyroid cartilage. Insertion: inferior side of the body and greater horn of the hyoid bone. Action: pulls hyoid and thyroid cartilage closer together.
What is the Thyrohyoid muscle?
Sometimes divided into the muscularis and vocalis muscles. Contributes to the vocal folds. Origin: Anteriorly from the inner surface of the Thyroid. Insertion: Vocal and Muscular processes of the arytenoids. Action: May increase or decrease fundamental frequency in conjunction with other intrinsic muscles
What is the Thyroarytenoid Muscle?
Another name for the supraglottic cavity. It is superior to the FVF.
What is the Laryngeal Vestible?
This is the horseshoe-shaped "floating" bone of the Larynx. It suspends the thyroid
What is the hyoid bone?
Thin muscle forming the "floor" of the oral cavity. Origin is the mylohyoid line of the internal surface of the mandible. 2 insertions: Posterior fibers to the hyoid bone, Anterior fibers are linked with fibers on the opposite side through the median raphe. Action pulls hyoid superiorly
What is the Mylohyoid Muscle?
Thin muscle on the anterior surface of the neck. Origin: posterior surface of the manubrium and medial border of the clavicle. Insertion: Inferior border of the body of the hyoid bone. Action: depresses the hyoid bone
What is the Sternohyoid Muscle?
Fan-shaped muscle between cricoid and thyroid cartilages. Has 2 divisions: pars oblique and pars recta. Origin: Cricoid Arch. Insertion: Inferior border of the lamina and inferior cornu of the thyroid cartilage. Brings the thyroid and cricoid closer; pulls the thyroid forward lengthening and thinning the VF thus increasing tension and pitch.
What is the Cricothyroid Muscle?
These are the 5 layers of the TVF.
What are the epithelium, superficial layer, intermediate layer, and deep layer, and thyroarytenoid muscle?
This synovial joint is responsible for "bending the thyroid over the cricoid and the anteroposterior gliding to the thyroid to lengthen and shorten the TVF.
What is the Cricothyroid Joint?
Narrow cylindrical muscle. Origin Inferior mental spine (genial tubercle) of the internal surface of the mandible. Insertion is the anterior surface of the body of the hyoid. Action: pulls hyoid anteriorly.
What is the Geniohyoid muscle?
Thin narrow muscle with 2 bellies: Superior and Inferior that are joined by a central tendon that is connected by fascia to the clavicle. Origin: Superior border of the scapula. Insertion: Inferior border of the body of the hyoid. Action: Depress the hyoid bone.
What is the Omohyoid Muscle?
Fan-shaped muscle on the posterior surface of the cricoid. Origin: Quaderate Lamina of the cricoid. Insertion: Posterior surface of the muscular process of the arytenoid cartilages. Action Laterally rotates the arytenoids and opens the glottis. It is an ABductor muscle.
What is the Posterior Cricoarytenoid Muscle?
This layer is also called Reinke's Space. Swelling in this area is usually caused by smoking and is called Reinke's edema
What is the Superficial Layer?
These ligaments and membranes link the structures of the larynx together.
What are the Extrinsic Ligaments and Membranes?
(Thyrohyoid Ligament, Hyoepiglottic Ligament, Cricotracheal Membrane)
Long thin muscle running parallel to the Digastric"s posterior belly. Origin is the Styloid process of the temporal bone. Insertion is the body of the hyoid bone near the greater horn. Action- elevates and retracts the hyoid bone.
What is the stylohyoid?
Long thin muscle on the anterior surface of the neck. Origin: posterior surface of the manubrium and the first costal cartilage. Insertion Oblique line of the thyroid cartilage. Action: lowers the thyroid cartilage.
What is the Sternothyroid Muscle?
Located deep to the thyroid cartilage. Origin: Superior surface of the anterolateral border of the cricoid arch. Insertion: Anterior surface of the muscular process of the arytenoid. Action: Medially rotates the arytenoids and closes the glottis. It is an adductor muscle.
What is the Lateral Cricoarytenoid Muscle?
These 3 layers comprise the Lamina Propria.
What are the Superficial, Intermediate, and Deep Layers?
These Ligaments and Membranes Link and support the laryngeal cartilage.
What are the Intrinsic Ligaments and Membranes?
(Quadrangular Membrane and Lateral Cricothyroid Ligament or Membrane)
These are the 4 muscles that combined elevate, retract, and protract the hyoid bone.
What are the Digastric, Mylohyoid, Geniohyoid, and Stylohyoid Muscles?
These are also called the "Strap" Muscles. They are 4 paired muscles that connect the hyoid bone to the sternum, clavicle, and scapula. Important in vocalization, swallowing, and mastication.
What are the infrahyoid muscles: Thyrohyoid, Omohyoid, Sternohyoid, and Sternothyroid Muscles?
Not paired. Muscle fibers are oriented in the oblique and transverse directions. Oblique fibers form an X. Located superficial to the transverse fibers. Origin: Oblique-between the base and the muscular process of 1 arytenoid; Transverse-lateral border of arytenoid between the muscular process and the apex. Insertion: O-Apex of the opposite arytenoid. T- Lateral border of arytenoid. Action: Slides Arytenoids closed and closes glottis (adductor muscle)
What is the Interarytenoid Muscle?
These 2 layers combined make up the Vocal Ligament.
What are the Intermediate and Deep Layers of the Lamina Propria?
These are the 7 cartilages of the Larynx.
Thyroid, Cricoid, Arytenoid, Corniculate, Cuneiform, Triticeal, and Epiglottis Cartilages?