CVR: practice questions (week 11)

upper airway equine, lower airway canine, lower airway PA, lower airway equine, toxins

What is the opening of the sinuses into the nasal cavity called?

Nasomaxillary aperture

What major neurovascular structures are closely associated with the guttural pouch?

• Facial (7)

• Vagus (10)

• Hypoglossal (12)

• Internal carotid

• External carotid

• Maxillary artery & vein

What bone separates the GP into a medial + lateral compartment?

Cricoarytenoidales

What is the narrowest part of the equine airway?

Rima glottidis

What muscles open the rima glottis/abduct the arytenoid cartilages in the horse?

Cricoarytenoidales dorsales

What nerve innervates most of the muscles of the larynx in the horse?

Recurrent laryngeal nerve → specifically caudal laryngeal nerve (terminal branch) which is a branch of vagus nerve

-Recurrent does the Rest, Cranial does the Cricothyroid

What is the only muscle innervated by the cranial laryngeal nerve?

Cricothyroideus muscle

Why does tongue position affect laryngeal position in the horse?

The tongue, hyoid apparatus, & larynx form a tightly linked functional chain → moving one part moves the others

What is an adult horse’s normal respiratory rate?

What are the borders of the equine lung field?