Forelimb Lecture #2

Question 1

What is the action of the trapezius? Innervation?

Answer 1

Action: elevates shoulder, cervical part retracts leg, thoracic part protracts leg

Innervation: cranial nerve XI (spinal accessory nerve)

Question 2

What is the action of the brachiocephalicus? Innervation?

Answer 2

Protraction or move neck laterally

cranial nerve XI (spinal accessory nerve) and axillary

Question 3

What is the action of the omotransversarius? Innervation?

Answer 3

Protraction

cranial nerve XI (spinal accessory nerve) and cervical

Question 4

What is the action of the latissimus dorsi? Innervation?

Answer 4

Retraction and flexion of the shoulder

Thoracodorsal

Question 5

What is the action of the Pectoralis? Innervation?

Answer 5

Superficial (adduct and extend shoulder), deep/profundus (adduct and flex shoulder)

Pectoral and lateral thoracic

Question 6

What is the action of the rhomboideus? Innervation?

Answer 6

Retraction

spinal nerves

Question 7

What is the action of the thoracic serratus ventralis? Innervation?

Answer 7

Bears weight, protracts, raise thorax, shift weight

Long thoracic

Question 8

What is the action of the cervical serratus ventralis? Innervation?

Answer 8

Bears weight, retracts, raise thorax, shift weight

Long thoracic

Question 9

What is the action of the subclavius? Innervation?

Answer 9

Retracts

Pectoral

Question 10

what muscles protract the leg? (5)

Answer 10

brachiocephalicus, omotransversarius, superficial pectoralis, thoracic trapezius, post-scapular/thoracic serratus ventralis

Question 11

What muscles retract the leg? (5)

Answer 11

Rhomboideus, cervical trapezius, cervical serratus ventralis, latissimus dorsi, pectoralis

Question 12

What nerves are involved in the brachial plexus? and where are they going

Answer 12

Axillary (to deltoid),
Suprascapular (supraspinatus), thoracodorsal (latissimus dorsi),
long thoracic, (serratus ventralis)
subscapular (subscapular muscle)
musculocutaneous (biceps)
radial (to carpal and digital extensor), ulnar and medial (to carpal and digital flexor)

Question 13

Which nerves of the brachial plexus are local vs continue down the leg?

Answer 13

Local: long thoracic, suprascapular, axillary, thoracodorsal, subscapular, lateral thoracic

Continue: radial, ulnar, median, musculocutaneous

Question 14

What muscles make up the triangle around the superficial cervical lymphnode?

Answer 14

Brachiocephalicus, omotransversarius, cervical trapezius