TOPIC 12

Question 1

What to do first?

Answer 1

Start on the lateral aspect of dogs thorax, running along chestwall

Question 2

N.Thoracicus lateralis

Answer 2

Runs in the space between the M.Latissimus dorsi and M.pectorales profundus

Branches of the C8 and Th1 from the plexus (caudal part of plexus)
Innervates: The abdominal part of the cutaneus muscle. + Some branches that intermingle with intercostal nerves

Sensory and Motornerve

Question 3

N.Thoracicus longus

Answer 3

Runs over the M.serratus ventralis = innervation of the thoracic part if this muscle.
Cervical part of seratus ventralis muscle is supplied by cervical spinal nerves
Motor nerve

• Look for m.serratus ventralis pars thoracicus
• Dissect with the aim of reflecting the forlimb.
• Transect the m.latissimus dorsi around the last rib.
• Reflect cranialy, as you do this: Try to abduct the scapula away from the body.
• The mm. serratus ventralis will be tight, holding the scapula to the chest.
• The nerve runs over the muscle belly!

Question 4

N.thoracodorsalis

Answer 4

Runs with A.thoracodorsalis 
Branches from C8, (C6&C7)
Arise from the last cervical spinal nerve
Runs caudaly 
Crosses the teres major muscle
Supplies m.latissimus dorsi.
Branches out on the medial surface of the brodest muscle of the back - innervates
Motor nerve

• Reflect large portion of m.latissimus dorsi cranialy
• Follow the muscle belly towards its point of insertion (Tuberositas teres major)
• On this flat muscles medial side, you will se a nerve running

Question 5

Nn. Pectoralis cranialis et caudalis

Answer 5

Cranial: Derive from ventral branches C6-C8 spinal nerve
Caudal: Derive from ventral branches of C8,T1andT2

Look between superficial and deep pectoral muscles. Who is more cranialy and caudaly?

Question 6

Thoracic Girdle = PRECARDIAC section

Answer 6

Tr.vagus sympatheticus
Vagus nerve
Tr. sympatheticus
Ansa subclavia
Ggl Stellate mediastinum
Phrenic nerve