Page 143 - Anatomy and Physiology of Farm Animals, 8th Edition

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Table 7-2. Muscles of the Thoracic Limb
Muscle Origin Insertion Primary Actions Innervation
m. trapezius Ligaments of the dorsal midline Scapular spine Lifts, advances, and retracts scapula Accessory n.
m. rhomboideus Ligaments of the dorsal midline Medial side scapular cartilage Lifts and advances scapula, lifts Cervical and thoracic
neck spinal nn.
m. serratus ventralis Transverse processes of caudal Medial side of scapula and Supports trunk, lifts neck, advances Cervical spinal nn, long
cervical and cranial thoracic scapular cartilage and retracts scapula thoracic n.
vertebrae, first 8 or 9 ribs
m. omotransversarius F ascia of shoulder and arm Transverse processes of cranial Advances limb, lateral neck flexion Cervical spinal nn.
cervical vertebrae
m. brachiocephalicus Occipital bone, transverse Medial fascia of arm and Lateral neck flexion, shoulder Cervical spinal nn.,
m. cleidobrachialis processes of cervical vertebrae forearm, lateral side of humerus, extension, advances limb accessoryn.
m. cleidocephalicus deltoid tuberosity
(m. cleidomastoideus)
m. latissimus dorsi Spinous processes of thoracic Medial humerus Limb retraction, shoulder flexion Thoracodorsal n.
and lumbar vertebrae
m. pectoralis superficialis Sternum and cranial costal Medial humerus and fascia of Limb adduction Cranial and caudal
(superficial pectoral m.) cartilages arm and forearm pectoral nn.
m. pectoralis profundus Sternum, ribs, abdominal fascia Craniomedial humerus Adduction and retraction of limb, Cranial and caudal
(deeppectoral m.) advances trunk when limb is pectoral nn.
weight€bearing
m. subclavius Cranial sternum and costal Epimysium of m. supraspinatus Support of trunk, shoulder Cranial pectoral nn.
cartilages stabilization
m. supraspinatus Supraspinous fossa of scapula Greater tubercle of humerus Stabilization and extension of Suprascapular n.
shoulder
m. infraspinatus I nfraspinous fossa of scapula Greater tubercle of humerus Stabilization and flexion of shoulder Suprascapular n.
m. subscapularis Subscapular fossa Medial humerus Shoulder stabilization Subscapular n.
m. teres major C audal border of scapula Medial humerus (teres major Shoulder flexion Axillary n.
tuberosity)
m. teres minor C audal border scapula Proximal to deltoid tuberosity Shoulder flexion Axillary n.
m. deltoideus S capular spine Deltoid tuberosity Shoulder flexion Axillary n.
m. coracobrachialis C oracoid process of scapula Medial humerus Shoulder extension Musculocutaneous n.