LAB 2 - EXTRINSIC MUSCLES Flashcards
What are the two parts of the trapezius muscle in goats?
thoracic part and Cervical part
Q2: What is the main action of the thoracic part of the trapezius?
Retraction of the scapula
Q3: What is the main action of the cervical part of the trapezius?
= Elevation, retraction, and lateral movement of the scapula
Q4: What is the innervation of both parts of the trapezius?
= Accessory nerve (cranial nerve XI) and cervical spinal nerves
What are the parts of the rhomboideus muscle?
Cervical part and Thoracic part
What action is common to both parts of the rhomboideus muscle
Retraction and elevation of the scapula
Which nerve innervates the rhomboideus muscle?
Dorsal branches of cervical spinal nerves
What specific additional action does the thoracic part contribute to?
(Rhomboideus Muscle)
Medial rotation of the scapula
What are the three parts of the brachiocephalicus muscle?
Cleidocephalicus (Cleidooccipitalis and Cleidomastoideus), Cleidobrachialis
What action is performed by cleidobrachialis?
Protraction of the forelimb
What are the actions of cleidocephalicus?
Extension, flexion, and lateral flexion of the head and neck
What innervates the brachiocephalicus muscle?
Accessory nerve (cranial nerve XI), cervical spinal nerves,
and brachial plexus
What is the primary action of the omotransversarius when the limb is fixed?
Lateral flexion of the neck
What is the action of the omotransversarius when the limb is not fixed?
Protraction of the forelimb
What nerve innervates the omotransversarius?
Accessory nerve (cranial nerve XI)
What is the primary action of the latissimus dorsi on the forelimb?
Flexion of the shoulder joint
What other movements does the latissimus dorsi assist in?
Adduction and medial rotation of the forelimb
Which nerve innervates the latissimus dorsi?
Thoracodorsal nerve
What are the two parts of the superficial pectoral muscle?
Transverse part and descending/ascending part
What action is performed by both parts of the superficial pectoral?
Adduction of the forelimb
What is the action of the transverse part specifically?
= Flexion of the shoulder joint
What is the action of the descending / ascending part specifically?
Extension of the shoulder joint
What innervates the superficial pectorals?
Lateral pectoral nerve
Which nerve innervates the deep pectoral?
Medial pectoral nerve
