Assignment 7 (Equine)

Question 1

Which nerve is responsible for the motor innervation of most of the muscles that move the eye?

Answer 1

oculomotor nerve

Question 2

Sensory innervation of the globe or eyeball is via the _______ nerve.

Answer 2

opthalmic

Question 3

Which nerve is responsible for the motor innervation of all but one intrinsic muscles of the larynx?

Answer 3

recurrent laryngeal

Question 4

What are the functions of the larynx? (3)

Answer 4

1. Regulates what enters the trachea
2. Prevents ingesta from entering the respiratory tract during swallowing
3. Functions in vocalization

Question 5

What nerve goes through the thyroid foramen?

Answer 5

cranial laryngeal nerve

Question 6

What is the surgical access point to the laryngeal cavity?

Answer 6

the thyroid notch

Question 7

What is the purpose of the hyoid apparatus?

Answer 7

It suspends the larynx and tongue from the base of the skull

Question 8

What does the thyrohyoid bone articulate with?

Answer 8

the rostral cornu of the thyroid cartilage

Question 9

What does the stylohyoid bone articulate with?

Answer 9

Via a small cartilage called the tympanohyoid with the styloid process of the petrous temporal bone of the skull

Question 10

Which hyoid bone articulates with the larynx?

Answer 10

thyrohyoid

Question 11

The caudal border of the soft palate sits ______ relative to the rostral edge of the epiglottis.

Answer 11

Ventral

Question 12

The epiglottis sits ______ relative to the soft palate.

Answer 12

Dorsal

Question 13

What provides sensory innervation to the laryngeal muscosa?

Answer 13

Cranial laryngeal n. (branch of vagus n.)

Question 14

What provides motor innervation to all the intrinsic muscles of the larynx?

Answer 14

caudal laryngeal n.

Question 15

What provides motor innervation to the the cricothyroideus m.?

Answer 15

cranial laryngeal n.

Question 16

What muscle is the only dilator of the glottic cleft? Are the vocal folds abducted or adducted by this muscle?

Answer 16

Cricoarytenoideus m.

Contraction of this muscle abducts the vocal folds.

Question 17

All the intrinsic muscles of the larynx are primarily constrictors that abduct the vocal folds closing the glottic cleft. True or false?

Answer 17

False.

All instrinsic muscles of the larynx are primarily constrictors except cricoarytenoideus.

They ADDUCT the vocal folds to close the glottic cleft.

Question 18

What causes roaring in the larynx?

Answer 18

laryngeal hemoplegia

Question 19

What is temporohyoid osteoarthropthy? What bones and joints are affect?

Answer 19

arthritis of the hyoid apparatus

temporohyoid joint and stylohyoid bone affected