Flashcards in Lab 2: Neck, withers and thorax Deck (17):
what does the omohyoideus lie between in the cranial half of the neck?
the external jugular vein and the carotid sheath
why should venipencture only occur in the cranial half of the neck?
because in the caudal part of the neck, inadvertent injection into the common carotid artery could occur.
(in the cranial part of the neck, the omohyoideus muscle separates the external jugular vein and the carotid sheath preventing accidental injection into the common carotid a.)
what is contained within the carotid sheath?
1. common carotid artery
2. vagosympathetic trunk
3. recurrent laryngeal nerve
4. tracheal lymphatic ducts
what is the origin and insertion of the sternocephalicus muscle?
origin: the manubrium of the sternum
insertion: the ramus of the mandible
What structures form Viborg's triangle?
1. the sternocephalicus tendon of insertion caudally
2. the ramus of the mandilbe cranially
3. the linguofacial vein ventrally
what is the significance of Viborg's triangle?
it is a surgical landmark for an enlarged guttural pouch - an equine-specific dilatation of the auditory tube
which 4 muscle bellies in the neck are fused together? and what are they collectively called?
the sternohyoideus and sternothyroideus muscles each have one muscle belly (one on the right side, and another on the left side).
all four of these muscle bellies are fused together and commonly referred to as the sterno/thyro/hyoideus muscle.
which two muscles and which nerve are resected in Forssell's surgical correction for crib-biting?
the omoyoideus and the sternothyrohyoideus muscles
the ventral branch of the accessory nerve
between which tracheal cartilages is a tracheotomy typically performed?
between tracheal cartilages 4 and 6
how many lobes does the thyroid gland have?
2 - one on each ventrolateral side of the trachea at the level of the first few tracheal cartilages.
describe the location of the cranial deep cervical lymph nodes
they lie on the trachea and adjacent to the thyroid gland
describe the location of the pectoral groove
it lies between the brachiocephalicus laterally and the descending pectoral muscle medially
what lies within the pectoral groove?
the cephalic vein and the deltoid branch of the superficial cervical artery
what is the clinical significance of the location of the cephalic vein and superficial cervical artery?
they lie within the pectoral groove and are pretty superficial. they could be easily cut if the animal ran into a fence.
where does the rhomboideus cervicis muscle originate?
along the funicular part of the nuchal ligament
describe the appearance and location of the laminar part of the nuchal ligament? where does it attach?
it is wide and strong yet flexible. it runs from C2 to T2 and attaches ventrally to the cervical vertebrae.