Equine Musculoskeletal: Thoracic Limb (2) Flashcards
Label 1-5
- brachiocephalicus
- omotransversarius
- trapezius (cervical & thoracic)
- latissimus dorsi
- serratus ventralis
What muscle is this?
serratus ventralis m.
Horses have a _____ sternum
keeled
What is the function of the dorsal scapular ligament?
helps serratus ventralis m.
help extrinsic muscles keep thoracic limb in proper position
T/F: There is no cephalic portion of the rhomboideus in the horse
TRUE - only cervical and thoracic portions
What is the thoracic sling? It is an example of ________
the extrinsic muscles suspend the trunk between the forelimbs and fix the scapula
synsarcosis
Label 1-5
- dorsal scapular ligament
- trapezius m.
- rhomboideus m.
- serratus ventralis m.
- pectoral mm.
What happened to this horse?
rupture of serratus ventralis muscle
Label 1-2
- supraspinatus m.
- infraspinatus m.
What is the origin and insertion of the supraspinatus m.?
origin: supraspinous fossa
insertion: greater and lesser tubercles of humerus
What is the action of the supraspinatus m.?
extend humeral joint
stabilize humeral joint
What is the origin and insertion of the infraspinatus m.?
origin: infraspinous fossa of scapula
insertions:
- superficial tendon - on the greater tubercle of humerus (infraspinatus bursa)
- deep tendon - on the caudal eminence of greater tubercle
What is the origin and insertion of the deltoideus m.?
origin: caudal border of scapula; aponeurosis which covers infraspinatus
insertion: deltoid tuberosity
What is the origin and insertion of the subclavius m.?
origin: cranial part of the sternum closely associated to supraspinatus m.
insertion: supraspinatus muscle epimysium (outer layer of muscle)
Label 1-2
- subclavius m.
- deltoideus m.
What is the origin and insertion of the subscapularis m.?
origin: subscapular fossa
insertion: lesser tubercle of humerus
What is the origin and insertion of the teres major m.?
origin: caudal angle of the scapula and adjacent caudal border of scapula
insertion: teres major tuberosity of humerus
Label 1-2
- subscapularis m.
- teres major m.
What is the origin and insertion of the biceps brachii m.?
origin: supraglenoid tubercle
insertion: radial tuberosity, extensor carpi radialis via lacertus fibrosus
What is the intertubercular bursa located in between?
the tendon of the origin of the biceps brachii
and the intertubercular grooves of the humerus
Where is the lacertus fibrosus? It is part of the _______
tendinous insertion of the biceps brachii on the extensor carpi radialis m.
part of the stay apparatus
Label 1-6
- intertubercular bursa
- biceps brachii m.
- lacertus fibrosus
- biceps
- lacertus fibrosus
- extensor carpi radialis m.
Label 1-3
- biceps brachii m.
- extensor carpi radialis m.
- lacertus fibrosus
What is the origin and insertion of the triceps brachii m.?
origins: long head - caudal border of scapula
> lateral head: deltoid tuberosity
> medial head: medial aspect of humerus
insertion: olecranon tuber