Third 50 A Flashcards
Name the 4 infrahyoid muscles.
- Omohyoid (scapula to hyoid).
- Sternohyoid (sternum to hyoid).
- Sternothyroid (sternum to thyroid).
- Thyrohyoid (thyroid to hyoid).
What is the function of the intrinsic muscles of the larynx?
They control the shape of the rima glottidis, and the length and tension of the vocal folds.
What intrinsic laryngeal muscle is not innervated by the recurrent laryngeal nerve?
Cricothyroid
What is the function of the cricothyroid muscles?
Stretches and tenses the vocal cords. Important for the creation of speech.
What is the function of the thyroarytenoid muscles?
Relaxes the vocal ligament, allowing for a softer voice.
What is the function of the posterior cricoarytenoid muscles?
Abduction of the vocal cords; the only muscles capable of widening the rima glottidis.
What is the function of the lateral cricoarytenoid muscles?
Adduction of the vocal folds; narrow the rima glottidis.
What is the function of the transverse arytenoids muscles?
Adduction of the arytenoid cartilages, narrows the laryngeal inlet.
What nerve passes through the parotid gland?
The facial nerve - Cn 7.
Where does the pharynx extend from and to?
The base of the skull to the cricoid cartilage (C6).
What is the function of the pharyngeal constrictor muscles?
They contract sequentially to propel food into the oesophagus.
What is the origin of the superior constrictor?
Pterigoid plate and pterygomandibular raphe.
What is the origin of the middle constrictor?
Hyoid bone
Origin of the inferior constrictor?
Thyroid and cricoid cartilages
What is the function of the longitudinal pharyngeal muscles?
They shorten and widen the pharynx. They also elevate the pharynx during swallowing.