Equine Neck and Thorax - Comparative Anatomy

Question 1

What is the vertebral formula for equine species?

Answer 1

C7
T18
L6
S5
Cd15-25

Question 2

What ligament of the equine neck is unique to the equine species?

Answer 2

dorsoscapular ligament

Question 2

What is unique about the inververtebral discs of the equine species?

Answer 2

less distinct boundaries between anulus fibrosus and nucleus pulposus

Question 2

What forms the withers of the horse?

Answer 2

spinous processes of T2-T9 - exceptionally long

Question 3

Where can synovial joints form in the equine vertebral column?

Answer 3

inconsistent between L4-L6
constant between L5 and L6-sacrum

Question 4

What part of the brachiocephalicus muscle is present in the horse?

Answer 4

cleiodmastoideus

Question 5

What part of the sternocephalicus muscle is present in the horse?

Answer 5

sternomandibularis

Question 6

What part of the splenus muscle is present in the horse?

Answer 6

cervicis and capitis

Question 7

Describe the cervical thymus of the horse

Answer 7

poorly developed

Question 8

Does the horse have an internal jugular vein?

Answer 8

NO

Question 9

Describe the fibrous skeleton of the equine heart

Answer 9

present but less developed than that of the ruminant

Question 10

Describe the long axis of the equine heart

Answer 10

nearly verticle
between the 2nd-6th ICS

Question 11

Which coronary artery is dominant in the equine heart?

Answer 11

right coronary artery

Question 12

Describe the subclavian artery in the horse

Answer 12

comes off of the brachiocephalic trunk

Question 13

Does the horse have both a right and left azygous vein?

Answer 13

NO
right azygous vein only

Question 14

Describe the muscular coat of the equine esophagus

Answer 14

straited up to the base of the heart
smooth muscle thereafter

Question 15

Describe the lymph nodes in the equine neck

Answer 15

intercostal
cranial mediastinal
middle mediastinal
pulmonary
caudal mediastinal - poorly developed/absent in the horse