VUSCULTURE OF THE LARYNX

Question 1

The laryngeal arteries, branches of the superior and inferior thyroid arteries, supply the larynx

Answer 1

true

Question 2

arteries

Answer 2

The superior laryngeal artery accompanies the internal branch of the superior laryngeal nerve through the
thyrohyoid membrane and branches to supply the internal surface of the larynx.

• The cricothyroid artery, a small branch of the superior thyroid artery, supplies the cricothyroid muscle

• The inferior laryngeal artery, a branch of the inferior thyroid artery, accompanies the inferior laryngeal nerve
(terminal part of the recurrent laryngeal nerve) and supplies the mucous membrane and muscles in the inferior
part of the larynx

Question 3

veins

Answer 3

The laryngeal veins accompany the laryngeal
arteries.

• The superior laryngeal vein usually joins the
superior thyroid vein and through it drains into the
IJV

• The inferior laryngeal vein joins the inferior
thyroid vein or the venous plexus of veins on the
the anterior aspect of the trachea, which empties into
the left brachiocephalic vein.

Question 4

lymphatics

Answer 4

The laryngeal lymphatic vessels superior to the
vocal folds accompany the superior laryngeal
artery through the thyrohyoid membrane and
drain into the superior deep cervical lymph
nodes.

• The lymphatic vessels inferior to the vocal folds
drain into the pretracheal or paratracheal lymph
nodes, which drain into the inferior deep
cervical lymph nodes

Question 5

The nerves of the larynx are the superior and inferior laryngeal branches of the Vagus nerves (CN X)

Answer 5

true

Question 6

The superior laryngeal nerve arises from the inferior vagal ganglion at the superior end of the carotid triangle

Answer 6

o The nerve divides into two terminal branches within the carotid sheath: the internal laryngeal nerve
(sensory and autonomic) and the external laryngeal nerve (motor).
o The internal laryngeal nerve, the larger of the terminal branches supplies sensory fibres to the laryngeal
mucous membrane of the laryngeal vestibule and middle laryngeal cavity, including the superior surface of
the vocal folds.
o The external laryngeal nerve, the smaller terminal branch of the superior laryngeal nerve, supplies the
inferior pharyngeal constrictor and continues to supply the cricothyroid muscle.

Question 7

The inferior laryngeal nerve, the continuation of the recurrent laryngeal nerve (a branch of the Vagus nerve),
enters the larynx and divides into anterior and posterior branches

Answer 7

o The anterior branch supplies the lateral crico-arytenoid, thyro-arytenoid, vocalis, aryepiglottic, and thyroepiglottic muscles.
o The posterior branch supplies the posterior crico-arytenoid and transverse and oblique arytenoid muscles