Muscles of the Brachial Synsarcosis Flashcards
Origin of trapezius
Cervical: mid-dorsal aponeurosis
Thoracic: dorsal spines of thoracic vertebrae
Insertion of trapezius
Spine of scapula
Action of cervical trapezius
retraction
Action of thoracic trapezius
protraction of forelimb and elevation of shoulder
Innervation of trapezius
Cranial nerve XI (Spinal accessory nerve)
Blood supply of trapezius
Subscapular artery
Origin of brachiocephalicus
clavicular intersection
Insertion of brachiocephalicus
neck and skull and the humerus
Action of brachiocephalicus
protraction and moves neck laterally
Innervation of brachiocephalicus
Cranial nerve XI (Spinal accessory) and axillary
Origin of omotransversarius
Wing of the atlas
Insertion of omotransversarius
Distal scapular spine (horses) or acromion
Innervation of omotransversarius
cranial nerve XI (spinal accessory) and cervical
Action of omotransversarius
protraction
Omotransversarius in cows is…
indistinct (rudimentary)
Omotransversarius in horses is…
fused with brachiocephalicus (no acromion)
Origin of lat dorsi
thoracolumbar fascia (continuous with fascia)
Insertion of lat dorsi
humerus on the teres major tubercle
Action of lat dorsi
retraction and flexion of the shoulder (flexion because it crosses over the shoulder)
Innervation of lat dorsi
thoracodorsal
Blood supply of lat dorsi
Thoracodorsal
Origin of pectoralis
Sternum
Insertion of pectoralis
tubercles of the cranial humerus
Innervation of pectoralis
pectoral and lateral thoracic
Blood supply of pectoralis
pectoral
Action of pectoralis
both superficial and deep: adduction; superficial: extend shoulder; deep: flex shoulder
Origin of rhomboideus
R capitus (carnivores only): nuchal crest; R cervicis and R thoracis: dorsal neck and thorax, respectively
Insertion of rhomboideus
dorsal scapula and cartilage
Innervation of rhomboideus
Dorsal cervical and thoracic spinal nerves
Blood supply of rhomboideus
arteries in neck
Action of rhomboideus
retraction
Origin of thoracic serratus ventralis
ribs
Origin of cervical serratus ventralis
cervical transverse processes
Insertion of serratus ventralis
Subscapular fossa specifically the facies serrata
Innervation of serratus ventralis
Long thoracic
Blood supply of serratus ventralis
various collaterals
Action of serratus ventralis
bears weight, shifts weight, raises thorax, protracts (thoracic) and retracts (cervical)
Cervical serratus ventralis (protracts or retracts)
retracts
Thoracic serratus ventralis (protracts or retracts)
protracts
What animal is the subclavius found in in this course
horses only
Origin of subclavius
sternum and costal cartilage
Insertion of subclavius
supraspinatus and shoulder fascia
Action of subclavius
retracts
Innervation of subclavius
pectoral
What muscle prevents adduction
rhomboids
what muscle prevents abduction
pectorals