Blood Vessels of the Thoracic Limb

Question 1

Arteries Supplying the Thoracic Limb

(4)

Answer 1

Subclavian a.

Axillary a.

• External continuation of subclavian a.

Brachial a.

• Name changes from axillary a. at proximal humerus

Median a.

Question 2

Axillary a.

Answer 2

• Main artery to the thoracic limb
• Name of the axillary a. changes to “brachial a.” at the proximal humerus (end of teres major)

Branches:

• External thoracic a.
• Lateral thoracic a.
• Suprascapular a.
• Subscapular a. (2 branches off this)
  
  • Thoracodorsal a. (Latissimus dorsi m.)
  • Caudal circumflex humeral a. (deltoideus m.)

Question 3

Branches of the Subscapular a. (2)

Answer 3

• Thoracodorsal a. & v.
  
  • Supplies Latissimus dorsi m.
• Caudal circumflex humeral a. & v.
  
  • Supplies Deltoideus m.

Question 4

Cardiovascular System

Answer 4

• Heart (center)
• Blood Vessels
• Lymphatic Vessels

Question 5

Arteries

Answer 5

• Carry O2 rich blood from the heart to organs/tissues
• Rounder
• More muscular, hold their shape

Question 6

Veins

Answer 6

• Drain tissues
• Take blood from tissues back to the heart
• appear collapsed

Question 7

Collateral Circulation

Answer 7

• Blood vessels w/in organ or tissue communicate with eachother
• Blood supply received from neighboring minor vessels
• Basically- supply is lessened but not completely lost when collateral circulation is present
• Prevents ischemia

Question 8

Anastamoses

Answer 8

Connection made between adjacent blood vessels (collateral circulation)

Cranial circumflex humeral a. &

Caudal circumflex humeral a.

Cranial interosseous a. & c

ollateral ulnar a. & caudal interosseous a.

Transverse cubital a. & Caudal interosseous a.

Question 9

The “parent vessel” of the caudal circumflexhumeral a. is ______

Answer 9

Subscapular a.

Question 10

Main blood supply to the pectoral m.

Answer 10

External thoracic a.

Question 11

Lateral thoracic a.

Answer 11

• Supplies pectoral b/c of of vicinity
• Supplies cutaneous trunchi m.

Question 12

What is the main blood supply to the digits in all the species?

Answer 12

• Median a. & v.

Question 13

Brachial a.

(Parent vessel: Axillary a. )

Answer 13

Branches:

• Cranial circumflex humeral a.
  
  • supplies proximal biceps brachii m.
• Deep brachial a.
• Bicipital a.
• Transverse cubital a.
• Collateral ulnar a.
• Superficial brachial a.
• Common interosseus a.
  
  • Ulnar a.
  • Caudal interosseus a.
  • Cranial interosseus a.

NAME CHANGE –> median a. @ proximal antebrachium

Question 14

Cranial circumflex humeral a.

Answer 14

• Branch off of brachial a.
• Extends cranially and dives between biceps brachii m. and the humerus
• circumflex b/c it goes in the cranial direction around the humerus

SPECIES DIFFERENCE = not in cows!

Question 15

Deep brachial a.

Answer 15

• Extends caudally
• Dives between the long head of triceps brachii m. & medial head of triceps brachii m.

Question 16

Bicipital a.

Answer 16

• Extends cranially
• Supplies biceps brachii m.

Question 17

Transverse cubital a.

Answer 17

• Dives deep into biceps brachii m. to supply the elbow joint
  *

Question 18

Caudal circumflex humeral a.

Answer 18

• Supplies deltoideus m.
• Caudal edge of humerus dives caudally then circles around humerus

Question 19

External thoracic a.

Answer 19

• Branch off axillary a.
• Supplies pectoral mm.
• Parent vessel = Axillary a.

Question 20

Collateral ulnar a. & v.

Answer 20

• Distal part of triceps brachii m. & caudal aspect of the elbow
• Tensor fasciae antebrachii m.
• Parent vessel = Brachial a.

Question 21

Thoracodorsal a., v. and n.

Answer 21

Latissimus dorsi m.