Lecture 4 - Muscles Flashcards
What is the origin of the omotransversarius?
Distal end of spine of scapula
What is the insertion of the omotransversarius?
Transverse wing of the atlas
What is the nerve of the omotransversarius?
Accessory n.
What is the action of the omotransversarius?
Advance limb or flex neck laterally
What is the origin of the trapezius?
Nuchal ligament, supraspinous ligament
What is the insertion of the trapezius?
Spine of scapula
What is the nerve of the trapezius?
Accessory n.
What is the action of the trapezius?
Elevate shoulder, abduct shoulder, draws limb forward, fixes shoulder
What is the origin of the Brachiocephalis?
clavical intersection
What is the insertion of the cleidobrachialis?
Distal end of cranial border of humerus
What is the insertion of the cleidocephalis?
Cranial 1/2 of mid-dorsal raphe and mastoid process
What is the nerve of the Brachiocephalis?
Accessory n.
What is the action of the Brachiocephalis?
Advance forelimb, extend shoulder joint, draw head and neck laterally
What are the two parts of the brachiocephalis?
cleidobrachialis and cleidocephalicus
What are the parts of the rhomboideus?
thoracis, cervicis, and capitis
What is the origin of the thoracis?
Spinous process of first 7 thoracic vertebrae
What is the origin of the cervicis?
Median raphe of neck
What is the origin of the capitis?
Occipital bone and nuchal ligament
What is the nerve of the rhomboideus?
Ventral rami of C and T spinal n.
What is the insertion of the rhomboideus?
Dorsal border of scaplula
What is the action of the rhomboideus?
Elevate thoracic limb and draw scapula against trunk
What is the origin of the latissimus dorsi?
Thoracolumbar fascia
What is the insertion of the latissimus dorsi?
Teres major tuberosity (of humerus)
What is the nerve of the latissimus dorsi?
Thoracodorsal n.
What is the action of the latissimus dorsi?
Draw free limb caudally, flex shoulder joint
What is the origin of the superficial pectoral?
1st two sternebrae, fibrous raphe between adjacent muscles
What is the insertion of the superficial pectoral?
whole crest of greater tubercle of humerus
What is the nerve of the superficial pectoral?
Cranial pectoral n.
What is the action of the superficial pectoral?
Adducts limbs, functions to prevent abduction of limb when bearing weight
What is the origin of the deep pectoral?
Ventral part of the sternum
What is the insertion of the deep pectoral?
- cranial part: lesser tubercle of humerus, w/ aponeurosis to greater tubercle
- caudal part: medial brachial fascia
What is the nerve of the deep pectoral?
Caudal pectoral n.
What is the action of the deep pectoral?
Adducts limb
What is the action of the deep pectoral when limb is advanced and fixed?
pulls trunk cranially and extends shoulders
What is the action of the deep pectoral when limb is not bear weight?
draws limb caudally and flexes shoulder
What is the origin of the subclavius?
Cranial part of sternum
What is the insertion of the subclavius?
Epimysium of supraspinatus m.
What is the nerve of the subclavius?
Caudal/Cranial pectoral n.
What is the action of the subclavius?
Acts w/ deep and superficial pectoral muscles
What animal has a subclavius?
horse
What are the two regions of the serratus ventralis?
thoracis and cervicis
What is the origin of the thoracis?
Transverse processes of last C3-C7 vertebrae
What is the origin of the cervicis?
Ribs 2-7(8)
What is the insertion of the serratus ventralis?
Facies serrata on dorsomedial 1/3 of scapula
What is the nerve of the serratus ventralis?
Long thoracic nerve
What is the action of the serratus ventralis?
Depress scapula and support trunk
