Arterial supply of the thoracic limb Flashcards
Route and connections of A. axillaris
- The main continuation of a. subclavia
- Extends from the first rib to the medial surface of m. teres major.
- Continued as a. brachialis in thr brachial region, and as a. mediana in the antebrachium.
- Runs distally on the medial aspect of the limb.
- Gives rise to a. thoracica externa and a. thoracica lateralis
Route and connections of A. subscapularis
- Passes between m. subscapularis and m. teres major.
- Runs caudo-dorsally alond the caudal margin of the scapula.
- Becomes subcutaneous at the caudal angle
- Gives off a. circumflexa humeri caudalis, a. collateralis radialis and a. thoracodorsalis
What does A. circumflexa humeri caudalis supplies?
- All heads of m. triceps brachii
- Both parts of m. deltoideus
Route and connections of A. circumflexa humeri caudalis
- Runs from medial to lateral by passing between caput longum and caput accessorium of the triceps.
- Gives rise to a. collateralis radialis.
- Anastomoses with a. circumflexa humeri cranialis lateral to the head of the Humerus.
What does A. collateralis radialis supplies?
- M. brachialis
- M. anconeus
Route and connections of A. collateralis radialis
- Given off the a. circumflexa humeri caudalis
- Passes deep to the caput accessorium of the triceps.
- Runs distally on the caudal and then laterl surfaces of m. brachialis.
- Gives rise to the nurtient artery of the Humerus.
- Anastomoses with a. brachialis superficialis proximal to the Elbow
What does A. thoracodorsalis supplies?
- The distal m. teres major
- m. latissimus dorsi
What does A. circumflexa humeri cranialis supplies?
- It’s surrounding muscles
- The shoulder joint
Route and connections of A. circumflexa humeri cranialis
- Usually the last branch os a. axillaris, but may arise from a. subscapularis.
- Runs over m. coracobrachialis and under m. biceps brachii’s tendon of origin.
- Ends by anastosmosing with a. circumflexa humeri caudalis.
Route and connections of A. brachialis
- Given off a. axill**aris.
- Runs directly to the elbow, where it lies crnial to the medial epicondyle.
- Flanked on either side by collateral veins.
- Gives rise to a. profunda brachii, a. bicipitalis and a. collateralis ulnaris.
What does a. profunda brachii supplies?
A number of branches to m. triceps brachii
Route and connections of a. profunda brachii
- Arises in the proximal third of the brachium.
- Passes between caput longum and caput mediale of m. triceps brachii.
- Sometimes double
What does A. bicipitalis supply?
M. biceps brachii
What does a. collateralis ulnaris supply?
- M. triceps brachii.
- M. anconeus.
- Antebrachial flexors.
- The elbow joint
Route and connections of a. collateralis ulnaris
- Arises in the distal third of the brachium from a. brachialis.
- Runs distally over the medial aspect of the olecranon.
Route and connections of A. brachialis superficialis
- Usually arises from a. brachialis, but can also arise from a. bicipitalis.
- Recieves a. collateralis radialis.
- Runs cranio-distally over the distal m. biceps brachii.
- Distal to the elbow, continues as a. antebrachialis superficialis cranialis.
Route and connections of a. antebrachialis superficialis cranialis
- Divides into two branches - medial and lateral.
- Both run on m. extensor carpi radialis.
What does A. transverse cubiti supply?
- Extensor muscles of carpus and digits
- Elbow joint
Route and connections of A. transverse cubiti
- Arises on the flexion surface of the elbow.
- Passes beneath the distal m. biceps brachii and m. brachialis
Route and connections of A. interossea communis
- Last branch of the a. brachialis, arises distal to the elbow joint, on m. pronator teres.
- Runs to the proximal interosseus space.
- Gives rise to a. ulnaris.
- Divides to form a. interosseus caudalis ans a. interosseus cranialis.
What does A. ulnaris supply?
- M. flexor digitalis profundus
- M. flexor carpi ulnaris
Route and connections of A. ulnaris
- Usually arises from a. interosseus communis, but can also arise from a. medianus.
- Passes through m. flexor digitalis profundus.
- Recieves a branch from a. profunda antebrachii.
- Divides into two branches: r. carpeus dorsalis and r. carpeus palmaris
What does A. interossea caudalis supply?
- Most of the antebrachial muscles.
- Radial and Ulnar nutrient arteries.
Route and connections of a. interossea caudalis
Lies in the interosseous space between m. pronator quadratus (medially) and the interosseous membrane (laterally)
