Major muscles Flashcards
Facial muscles
Masseter
Temporalis
Masseter
Origin: Zygomatic bone
Insertion Caudal ramus of mandible
Action: Assists with mastication
Temporalis
O: Parietal crest
I: Coronoid process
A: Assists with mastication
Muscles of the lateral neck
Sternocephalicus
Brachiocephalicus
Sternocephalicus
O: Manubrium
I: Temporal bone, nuchal crest
A: Flexes head laterally
Brachiocephalicus
O: Clavicular intersection
I: Dorsal neck, proximal humerus
A: Pulls limb forward
Muscles of the thorax
Intercostal muscles
Serratus ventralis
Pectorals
Intercostal muscles
O: Caudal border of cranial rib
I: Cranial border of caudal rib
A: Assists with respiration
Serratus ventralis
O: Ribs 1-7
I: Dorsal border of medial scapula
A: Abducts scapula
Pectorals
O: Cranial sternum
I: Proximal humerus
A: Flexion of humerus
Muscles of the shoulder
Deltoid muscle
Supraspinatus
Infraspinatus
Deltoid muscle
O: Spine of scapula, acromion
I: Deltoid tuberosity of humerus
A: Flexion of shoulder
Supraspinatus
O: Supraspinous fossa
I: Greater and lesser tubercle of humerus
A: Stabilizes shoulder
Infraspinatus
O: Infraspinous fossa
I: Greater tubercle of humerus
A: Stabilizes shoulder
Muscles of the upper forelimb
Triceps brachii
Brachialis
Biceps brachii