Lecture 20 - Ungulate URT 1 Flashcards

1
Q

nostrils

A

entrance to the nasal cavity

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2
Q

philtrum

A

medial deviation ventral to nose

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3
Q

choanae

A

transition from the nasal cavity into the nasopharynx

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4
Q

what nasal structure is unique to the horse? what is the function?

A

nasal diverticulum; acts as a “scoop” to draw air in during exercise by expanding the opening

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5
Q

where does the nasolacrimal duct open in horses and donkeys

A

horse = floor of vestibule
donkey = dorsolateral vestibule wall

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6
Q

atheroma

A

epidermal inclusion cyst of the diverticulum

“golf ball”

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7
Q

the conchae function to

A

warm and cleanse-inspired air

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8
Q

what is the largest pathway for a nasogastric tube?

A

ventral nasal meatus

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9
Q

what is the function of paranasal sinuses

A
  1. protection (“crumple zone”)
  2. immunity
  3. reduce weight of head
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10
Q

describe the sinuses in the horse

A
  1. frontal + dorsal conchal = conchofrontal sinus
  2. maxillary divided into rostral and caudal components
  3. sphenopalatine
  4. ventral, middle, ethmoidal conchal
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11
Q

T/F: as the horse ages, teeth mature and recede from maxillary sinus space

A

TRUE

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12
Q

T/F: all sinuses drain to the ventral sinus

A

FALSE - drain to rostral or caudal maxillary sinus

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13
Q

what has a large communication with the caudal maxillary sinus

A

conchofrontal sinus

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14
Q

what is the pathway in the paranasal sinus for horses

A
  1. conchofrontal
  2. frontomaxillary
  3. rostral and caudal maxillary
  4. nasomaxillary
  5. nasal cavity
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15
Q

where is the conchofrontal trephination site

A

5cm from the midline on the line of the medial canthus

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16
Q

where is the caudal maxillary sinus trephination

A

2cm rostral from the rim of the orbit and 2cm ventral to the line of the medial canthus

17
Q

what are the 3 reasons we trephine

A
  1. inspect
  2. biopsy
  3. treat
18
Q

what are the clinical applications of paranasal sinuses

A

performing a standing sinusotomy to appreciate the space

19
Q

describe the ox paranasal sinuses

A
  1. frontal - divided into caudal (containing post-orbital, nuchal, and cornual diverticula) and rostral
  2. maxillary w/ lacrimal bulla
  3. palatine
  4. sphenoid
20
Q

where does sinus drainage end in the ox?

A

nasal cavity

21
Q

what occurs when horn tipping is done too short

A

leaves cornual diverticulum open for infection

22
Q

what is the function of the guttural pouch

A

cool blood going to the brain and regulate intracranial pressure

23
Q

why divides the guttural pouch

A

stylohyoid bone

24
Q

what is found in the guttural pouch

A
  • CN 9-12
  • sympathetic trunk and cranial cervical ganglion
  • internal carotid, external carotid, and maxillary a.
  • retropharyngeal ln
25
how do strangles impact the guttural pouch
infects and results in lymphadenomegaly which may compress the upper airway ln abscess, rupture, and drain into guttural pouch
26
T/F: diseases affecting the guttural pouch will result in clinical signs consistent with affected structures in the area
TRUE
27
what are the reasons for severe epistaxis in equines
1. compromised artery (guttural pouch mycosis) 2. torn muscles (ruptured capitis mm.)