Week 1: Muscles of the Thoracic Limb (Origins, Insertions, Actions) Flashcards
Two parts of the superficial pectoral
pectoralis transversus
pectoralis descendens
Origin of the superficial pectoral (2)
First three sternebrae
median fibrous raphe at the ventral midline
Insertion of the superficial pectoral
Crest of the greater tubercle of the humerus
Action of the superficial pectoral (2)
Adduct limb (non-weight bearing) prevent abduction of limb (weight bearing)
Origin of the deep pectoral (2)
Ventral part of the sternum
Median fibrous raphe at the ventral midline
Insertion of the deep pectoral (2)
Lesser tubercle of the humerus (major portion of insertion)
Greater tubercle and crest of the humerus via aoneurosis
Action of the deep pectoral (3)
Pull trunk cranially when limb is advanced and fixed
Extend shoulder
Draw limb caudally when not supporting weight
Two parts of brachiocephalicus
cleidobrachialis and cleidocephalicus
Two parts of the cleidocephalicus
cleidomastoideus and cleidocervalicus
Brachiocephalicus origin
clavicular intersection
Brachiocephalicus insertion (3)
Distal end of cranial humerus
Middorsal fibrous raphe of the neck
Mastoid process of the temporal bone
Brachiocephalicus action (3)
Advance the limb
Extend the shoulder
Draw head to the side of the neck
Lymph node associated with the omotransversarius
The superficial cervical lymph node
also called the pre-scapular lymph node
Omotransversarius origin
Wing (transverse process) of the atlas (cervical vertebrae 1)
Omotransversarius insertion
Distal end of the spine of the scapula
Omotransversarius action (2)
Advance the limb
Flex the neck laterally
Two parts of the trapezius
Cervical trapezius
Thoracic trapezius
Trapezius origin (2)
Median fibrous raphe of the neck
Supraspinous ligament
Trapezius insertion
Spine of the scapula
Trapezius action (2)
elevate and abduct limb
Three parts of the rhomboideus
rhomboideus capitis
rhomboideus cervicis
rhomboideus thoracis
Rhomboideus origin (3)
Base of skull (nuchal crest of occipital bone)
Median fibrous raphe of neck
Spinous processes of thoracic vertebrae
Insertion of rhomboideus
Dorsal border of the scapula
Action of the rhomboideus (2)
Elevate limb
Draw scapula against trunk
Latissimus dorsi origin (2)
Thoracolumbar fascia
Last few ribs
Latissimus dorsi insertion
Teres major tuberosity of the humerus via the teres major tendon
Latissimus dorsi action (2)
draw the limb caudally
Flex shoulder
Serratus ventralis can be referred to as what kind of muscle
sling muscle
Origin of the serratus ventralis (2)
Ribs
Transverse processes of cervical vertebrae
Insertion of serratus ventralis
Serrated face of the scapula
Action of the serratus ventralis (2)
Support trunk
Depress scapula
Origin of the deltoideus
Spine and acromion of the scapula
Insertion of the deltoideus
Deltoid tuberosity of the humerus
Action of the deltoideus
Flex shoulder
Infraspinatus muscle has what bursa associated with it?
Subtendinous synovial bursa
Infraspinatus origin
infraspinous fossa of the scapula
Infraspinatus insertion
lateral side of the greater tubercle of the humerus
Infraspinatus action (4)
Laterally stabilizes the shoulder (prevents medial rotation while weight bearing)
Abduct and laterally rotate shoulder
Assists other muscles in the extension or flexion of the shoulder
