Lab 3: Neck, Withers, Thorax Flashcards
Insertion of rhomboideus thoracis muscle
scapular cartilage
The superficial thoracic vein runs along the lateral edge of what muscle?
deep (or ascending) pectoral muscle (beneath the cutaneous trunci)
Insertion of trapezius thoracis muscle
spin of scapula
At what vertebra does the funicular part of the nuchal ligament end?
T3
fx of supraspinous ligament
extends caudally from the funicular part of the nuchal ligament to connect the dorsal spinous processes and give rise to thoracolumbar fascia
fx of dorsoscapular ligament
helps keep the scapula attached to the body
parietal costal pleura lines what?
inside of the ribs
parietal diaphragmatic pleura lines what?
diaphragm
What major ligament lies beneath the rhomboideus thoracis m.?
dorsoscapular ligament
which muscles suspend the thorax between the limbs like a sling?
serratus ventralis thoracis and serratus ventralis cervicis
What nerves make up the brachial plexus?
ventral primary branches of C6-T2 (Majority is formed by branches of C7-T1)
What kind of lobation is present in horse lungs?
simple lobation
What does the L recurrent laryngeal nerve wrap around?
aortic arch
In which direction are the spinous processes of the thoracic vertebrae oriented?
dorsally and caudally
How do the spinous processes of adults differ from young animals?
They are capped by cartilage in young animals which subsequently ossifies (slow process in withers region)
How many ribs in the horse?
18 (correspond to the # of thoracic vertebrae). Each rib articulates dorsally with two contiguous vertebrae
What are “true” and “false” ribs?
True, aka sternal ribs articulate with the sternum by means of their costal cartilages (ribs 1-8). False, aka asternal ribs do not (ribs 9-18).
fx of costal groove in ribs
caudal groove on medial surface for passage of intercostal vessels and nerve
fx of xiphoid process and cartilage
point of attachment for diaphragm and linea alba
Origin, Insertion, Action, Supply of Brachiocephalicus Cleidomastoideus m.
O: Clavicle
I: Mastoid process
A: Unilateral-advances limb or turns head
S: Accessory, axillary, and cervical nerves
O/I/A/S of Brachiocephalicus cleidobrachialis m.
O: clavicle
I: crest of humerus
A: bilateral-flexes head and neck
S: Accessory, axillary, and cervical nerves
O/I/A/S of sternocephalicus m.
O: manubrium of sternum
I: ramus of mandible
A: unilateral-turns head and neck, bilateral-flexes head and neck
S: ventral br. of accessory n.
O/I/A/S of Trapezius cervicis
O: funiculus nuchae
I: spine of scapula
A: elevate/advance scapula
S: dorsal br. of accessory n.
O/I/A/S of Trapezius thoracis m.
O: supraspinous ligament
I: spine of scapula
A: elevate/retract scapula
S: dorsal br. of accessory n.
what forms the line of pleural reflection? Why is it clinically significant?
where the parietal costal pleura and parietal diaphragmatic pleura meet. Represents the dividing line between the pleural and peritoneal cavities.
