5. Arteries and veins of the thoracic limb Flashcards
What’s the main arteries of the thoracic limb?
A. axillaris
- A. brachialis
- A. subscapularis
A. mediana
What is the main artery of the thoracic limb and which artery does it arise from with continuation?
A. axillaris
It is the MAIN CONTINUATION of a. subclavia.
Will branch off before the subclavia comes around the 1st rib. Will run on the medial side of the limb to the regio of articulatio humeri
Which other vessels will run along next to a. axillaris
v. axillaris
In Ru which other structure beside A. axillaris will also contribute to supply thoracic limb?
A. cervicalis superficialis, but mainly A. axillaris still main imp one.
Which two structures generally arises from a. axillaris before it’s main division?
A. thoracica externa
A. suprascapularis
A. suprascapularis only Bo, Eq!
- In other species it’s a branch of a. cervicalis superficialis
A. thoracica exerna;
- Branch of
- Supply
- Origin
- Species
- Other imp?
Branch of a. axillaris
Supply generally mm. pectorales. (!not thoracica interna, as this is from subclavia)
From thorax and sternum
Found in all species
Species differences of supplying further beside Mm. pectorales.
A. suprascapularis;
- Branch of
- Supply
- Origin
- Species
- Other imp?
Branch of a. axillaris
It will run on the cranial margin of the scapula, between m. subscapularis and m. supraspinatus.
Origin in front of main division of a. axillaris
Supply
- articulatio humeri,
- Msubscapularis
- M. supraspinatus
- Small branches of a. suprascapularis supply articulatio humeri.
Bo, Eq only!
Describe specie differences of a. suprascapularis
In Eq, Bo is it a branch of A. axillaris for thoracic limb
In other species is it a branch of a. cervicalis superficialis which is a further branch of a. subclavia
Where does the main division for a. axillaris divide?
On the medial side of the area of art. humeri
What’s the main division of a. axillaris?
a. subscapularis
a. brachialis
A. subscapularis
- Branch of
- Supply
- Origin
- Species
- Other imp?
A. axillaris
- Runs dorsally on the caudal margin of the scapula, between m. teres major and m. subscapularis.
! 3 branches
- a. circumflexa humeri caudalis
- a. thoracodorsalis
- a. circumflexa scapulae
a. circumflexa humeri caudalis
Branch of Origin Supply Branches Other imp
- Main branch of a. subscapularis
- Will start on the caudal side, and run around the humerus.
- Supply the lateral muscles near the proximal epiphysis of the humerus.
- Branches:
1. r. proximalis
- a. collateralis radialis
(Not in Eq!, branch of a. profunda brachii)
a. circumflexa humeri caudalis will anastomose with one artery in which specie/species?
Will anastomose with a. transversa cubiti in Ru and Sus.
Branches of a. circumflexa humeri caudalis are which and will supply what?
r. proximalis
- Supply; M brachialis, lateral head of M triceps brachii, M. teres minor
a. collateralis radialis (not in Eq!)
- Supply; M brachialis, lateral head of M triceps brachii, M pectoralis ascendens and M. tensor fasciae antebrachia
a. thoracodorsalis
Branch of Origin Supply Branches Other imp
A. subscapularis
Continues caudo-dorsally, will run on the medial surface of the limb, across m. teres major and m. latissimus dorsi
Supply generally M. Latissimus dorsi
Will on M. latissimus dorsi give of muscular branches called rr. musculares which will along the way supply other muscles*
! In, Cap, Eq, Bo: Could be a branch of a. brachialis
a. circumflexa scapulae
Branch of
Origin
Supply
Branches
a. subscapularis
Will start off running on the caudal margin of scapula, then on the lateral surface of the scapula.
Supply - M. supraspinatus - M. infraspinatus - M. deltoideus = the muscles on the lateral surface of the scapula.
Which artery is the main continuation of a. axillaris and why?
A brachialis
Will run along the medial side of the antebrachium with v. brachialis and n. medianus on the level of the humerus
What’s the branches of a. brachialis?
a. circumflexa humeri cranialis
a. profunda brachii
a. collateralis ulnaris *
a. brachialis superficialis
- Only in Car
a. bicipitalis *
a. transversa cubiti *
R. muscularis
- Only in Bo
a. interossea communis
a. circumflexa humeri cranialis
Branch of Origin Supply Branches Other imp?
Branch of a. brachialis
Origin around proximal hypophysis near Humerus, but from cranial to caudal surface.
- Different origins in species, since in
Ru, Car it could be a branch directly from a. axillaris.
Or in Bo, Su a branch of a. subscapularis
Generally supply M. coracobrachialis and M. biceps brachii
! Will anastomose with a. circumflexa humeri caudalis which is a branch of a. subscapularis
How does a. circumflexa humeri cranialis differ in Eq and Su?
That the artery supplies as well M. pectoralis ascendens, M. subscapularis and M. teres major
a. profunda brachii
Branch of
Origin
Supply
Specie differences?
Branch of a. brachialis
Strong branch well developed in Eq and Car & thin in Su, Ru (can be absent)
Runs caudally and
Supply M. Triceps brachii generally.
In Eq; Supply M. biceps brachii, M. brachialis, M. anconeus as well.
Only in Eq arises a. collateralis radialis. In other species it’s the branch of
a. circumflexa humeri caudalis.
In which species does a. profunda brachii anastomoses and with which artery?
In Eq, Ru, Car: Anastomoses with a. collateralis ulnaris
a. collateralis ulnaris
Branch of
Origin
Supply
Specie differences?
Branch of a. brachialis
Caudal surface of thoracic limb
Origin at the level of the olecranon ulna continues medially of elbow joint to caudal surface of antebrachium.
Supply generally flexors of thoracic limb since it continues on caudal surface of antebrachium. (distally)
a. brachialis superficialis
Branch of
Origin
Supply
Specie differences?
Only in Car.
A branch of a. brachialis
Has 2 branches
– r. medialis: Runs and supply metacarpus and dorsal surface of digits
– a. antebrachialis superficialis cranialis: Metacarpus and dorsal surface of digits, but only 2nd 5th digit.
