Extrinsic Muscles of the Thoracic Limb Flashcards
Descending Superficial Pectoral Muscle ORIGIN
1st sternebra
descending superficial pectoral muscle INSERTION
crest of the greater tubercle of the humerus
transverse superficial pectoral muscle ORIGIN
first 2 or 3 sternebra
transverse superficial pectoral muscle INSERTION
crest of the greater tubercle of the humerus
superficial pectorals ACTION
adduct the limb when not weight bearing; prevent abduction of the limb when weight bearing
deep pectoral muscle ORIGIN
ventral part of the sternum; fibrous raphe of muscles (deep abdominal fascia at caudal end of sternum)
deep pectoral INSERTION
muscle and tendon mainly at lesser tubercle of the humerus’ aponeurosis to greater tubercle and crest; caudal part: medial brachial fascia
deep pectoral ACTION
pull trunk cranially, when not bearing weight, draw limb caudally and flex shoulder joint – abduct limb
braciocephalicus PARTS
cleidobrachialis (caudal) , cleidocephalicis (cranial) (cleidomastoideus, cleidocervialis), clavicular intersection (middle)
cleidobrachialis ORIGIN
(movable) clavicular intersection
cleidobrachialis INSERTION
distal end of the caudal border of the humerus
cleidocervicalis ORIGIN
clavicular intersection
cleidocervicalis INSERTION
cranial half of mid dorsal raphe, nuchal crest of occipital bone
cleidomastoideus ORIGIN
clavicular intersection
cleidomastoideus INSERTION
mastoid process on the temporal bone of the skull
brachiocephalicus ACTION
advance limb, extend shoulder joint, draw head and neck to the side
sternocephalicus PARTS
occipital and mastoid (at cranial end)
sternocephalicus ORIGIN
1st sternebra or manubrium
occipital sternocephalicus INSERTION
nuchal crest of the occipital bone
mastoid sternocephalicus INSERTION
mastoid process of the temporal bone of the skull
sternocephalicus ACTION
draw head and neck to the side
omotransversarius ORIGIN/ATTACHMENT (caudal end)
distal end of the spine of the scapula
omotransversarius INSERTION/ATTACHMENT (cranial end)
transverse process of the atlas (vertebrae c1)
omotransversarius ACTION
advance limb or flex neck
two muscles that create jugular groove
sternocephalicus and brachiocephalicus
trapezius ORIGIN
median raphe of the neck and supraspinous ligament (c3-t9)
trapezius INSERTION
spine of the scapula
trapezius ACTION
elevate and abduct the forelimb
latissmus dorsi ORIGIN
thoraculumbar fascia from spinous processes of lumbar to last 7 or 8 thoracic vertebrae’ muscular attachment to last 2 or 3 ribs
latissmus dorsi INSERTION
teres major tuberosity of humerus and teres major tendon
latissmus dorsi ACTION
draw free limb caudally as in digging and flex shoulder joint
rhomboideus PARTS
cervical, thoracic, capital
rhomboideus capitalis ORIGIN
nuchal crest of occipital bone
rhomboidues cervicis ORIGIN
median fibrous raphe of the neck
rhomboideus thoracis ORIGIN
spinous processes of the 1st 7 thoracic vertebrae
rhomboideus INSERTION
dorsal border of the scapula
rhomboideus ACTION
elevate forelimb and draw scapula against the trunk
serratus ventralis PARTS
cervicis and thoracis
serratus ventralis ORIGIN
transverse processes of last 5 cervical vertebrae and first 7 or 8 ribs ventral to their middle
serratus ventralis INSERTION
dorsomedial third of scapula (serrated face)
serratus ventralis ACTION
support trunk and depress scapula
