Lab 3: Neck, Withers, Thorax

Question 0

Insertion of rhomboideus thoracis muscle

Answer 0

scapular cartilage

Question 1

The superficial thoracic vein runs along the lateral edge of what muscle?

Answer 1

deep (or ascending) pectoral muscle (beneath the cutaneous trunci)

Question 2

Insertion of trapezius thoracis muscle

Answer 2

spin of scapula

Question 3

At what vertebra does the funicular part of the nuchal ligament end?

Answer 3

T3

Question 4

fx of supraspinous ligament

Answer 4

extends caudally from the funicular part of the nuchal ligament to connect the dorsal spinous processes and give rise to thoracolumbar fascia

Question 5

fx of dorsoscapular ligament

Answer 5

helps keep the scapula attached to the body

Question 6

parietal costal pleura lines what?

Answer 6

inside of the ribs

Question 7

parietal diaphragmatic pleura lines what?

Answer 7

diaphragm

Question 9

What major ligament lies beneath the rhomboideus thoracis m.?

Answer 9

dorsoscapular ligament

Question 10

which muscles suspend the thorax between the limbs like a sling?

Answer 10

serratus ventralis thoracis and serratus ventralis cervicis

Question 11

What nerves make up the brachial plexus?

Answer 11

ventral primary branches of C6-T2 (Majority is formed by branches of C7-T1)

Question 12

What kind of lobation is present in horse lungs?

Answer 12

simple lobation

Question 13

What does the L recurrent laryngeal nerve wrap around?

Answer 13

aortic arch

Question 14

In which direction are the spinous processes of the thoracic vertebrae oriented?

Answer 14

dorsally and caudally

Question 15

How do the spinous processes of adults differ from young animals?

Answer 15

They are capped by cartilage in young animals which subsequently ossifies (slow process in withers region)

Question 16

How many ribs in the horse?

Answer 16

18 (correspond to the # of thoracic vertebrae). Each rib articulates dorsally with two contiguous vertebrae

Question 17

What are “true” and “false” ribs?

Answer 17

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).

Question 18

fx of costal groove in ribs

Answer 18

caudal groove on medial surface for passage of intercostal vessels and nerve

Question 19

fx of xiphoid process and cartilage

Answer 19

point of attachment for diaphragm and linea alba

Question 20

Origin, Insertion, Action, Supply of Brachiocephalicus Cleidomastoideus m.

Answer 20

O: Clavicle
I: Mastoid process
A: Unilateral-advances limb or turns head
S: Accessory, axillary, and cervical nerves

Question 21

O/I/A/S of Brachiocephalicus cleidobrachialis m.

Answer 21

O: clavicle
I: crest of humerus
A: bilateral-flexes head and neck
S: Accessory, axillary, and cervical nerves

Question 22

O/I/A/S of sternocephalicus m.

Answer 22

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.

Question 23

O/I/A/S of Trapezius cervicis

Answer 23

O: funiculus nuchae
I: spine of scapula
A: elevate/advance scapula
S: dorsal br. of accessory n.

Question 24

O/I/A/S of Trapezius thoracis m.

Answer 24

O: supraspinous ligament
I: spine of scapula
A: elevate/retract scapula
S: dorsal br. of accessory n.

Question 25

what forms the line of pleural reflection? Why is it clinically significant?

Answer 25

where the parietal costal pleura and parietal diaphragmatic pleura meet. Represents the dividing line between the pleural and peritoneal cavities.