(5) Muscular System Flashcards
Origin: ligaments of the dorsal midline
Insertion: scapular spine
Primary Actions: lifts, advances, & retracts scapula
Innervation: accessory n.
m. trapezius
Origin: ligaments of the dorsal midline
Insertion: medial side scapular cartilage
Primary Actions: lifts & advances scapula, lifts neck
Innervation: cervical & thoracic spinal nn.
m. rhomboideus
Origin: transverse processes of caudal cervical & cranial thoracic vertebrae, first 8 or 9 ribs
Insertion: medial side of scapula & scapular cartilage
Primary Actions: supports trunk, lifts neck, advances & retracts scapula
Innervation: cervical spine nn, long thoracic n.
m. serratus ventralis
Origin: fascia of shoulder & arm
Insertion: transverse processes of cranial cervical vertebrae
Primary Actions: advances limb, lateral next flexion
Innervation: cervical spine n,
m. omotransversarius
Origin: Occipital bone, transverse processes of cervical vertebrae
Insertion: medial fascia of arm & forearm, lateral side of humerus, deltoid tuberosity
Primary Actions: lateral neck flexion, shoulder extension, advances limb
Innervation: cervical spine nn., accessory n.
m. brachiocephalicus
m. cleidobrachialis
m. cleidocephalicus
(m. cleidomastoideus)
Origin: spinous processes of thoracic & lumbar vertebrae
Insertion: medial humerus
Primary Actions: limb retraction, shoulder flexion
Innervation: thoracodorsal n.
m. latissimus dorsi
Origin: sternum & cranial costal cartilages
Insertion: medial humerus & fascia of arm & forearm
Primary Actions: limb adduction
Innervation: cranial & caudal pectoral nn.
m. pectoralis superficialis (superficial pectoral m.)
Origin: sternum, ribs, abdominal fascia
Insertion: craniomedial humerus
Primary Actions: adduction & retraction of limb, advances trunk when limb is weight-bearing
Innervation: cranial & caudal pectoral nn.
m. pectoralis profundus (deep pectoral m.)
Origin: supraspinous fossa of scapula
Insertion: greater tubercle of humerus
Primary Actions: stabilization & extension of shoulder
Innervation: suprascapular n.
m. supraspinatus
Origin: infraspinous fossa of scapula
Insertion: greater tubercle of humerus
Primary Actions: stabilization & flexion of shoulder
Innervation: suprascapular n.
m. infraspinatus
Origin: subscapular fossa
Insertion: medial humerus
Primary Actions: shoulder stabilization
Innervation: subscapular n.
m. subscapularis
Origin: caudal border of scapula
Insertion: medial humerus (teres major tuberosity)
Primary Actions: shoulder flexion
Innervation: axillary n.
m. teres major
Origin: caudal border scapula
Insertion: proximal to deltoid tuberosity
Primary Actions: shoulder flexion
Innervation: axillary n.
m. teres minor
Origin: scapular spine
Insertion: deltoid tuberosity
Primary Actions: shoulder flexion
Innervation: axillary n.
m. deltoideus
Origin: coracoid process of medial humerus scapula
Insertion: medial humerus
Primary Actions: shoulder extension
Innervation: musculocutaneous
m. coracobrachialis
Origin: supraglenoid tubercle
Insertion: cranial aspect of proximal radius & ulna
Primary Actions: elbow flexion, shoulder extension
Innervation: musculocutaneous
m. biceps brachii
Origin: caudal aspect of proximal humerus
Insertion: medial aspect of proximal radius
Primary Actions: elbow flexion
Innervation: musculocutaneous n.
m. brachialis
Origin: caudal border of scapula, proximal humerus
Insertion: olecranon process
Primary Actions: elbow extension, shoulder flexion (long head only)
Innervation: radial n.
m. triceps brachii
Origin: caudolateral humerus
Insertion: olecranon process
Primary Actions: elbow extension
Innervation: radial n.
m. anconeus
Origin: caudal border of scapula (via epimysium of triceps m.)
Insertion: olecranon pascess, deep antebrachium
Primary Actions: elbow extension, tensing of forearm fascia
Innervation: radial n.
m. tensor fasciae antibrachii
Origin: lateral humeral epicondyle
Insertion: cranial aspect of proximal metacarpus
Primary Actions: carpal extension
Innervation: radial n.
m. extensor carpi radialis
Origin: craniolateral radius
Insertion: medial metacarpus
Primary Actions: carpal extension
Innervation: radial n.
m. extensor carpi obliquus (abductor digiti I longus)