Exam 2 Nerves, Actions, Origins, & Insertions

Question 1

What is the OIA of the muscle that the cranial pectoral nerve innervates?

Answer 1

Origin: sternum
Insertion: crest of greater tubercle and cranial humeral border
Action: adduct the thoracic limb

Question 2

What is the OIA of the muscles that the suprascapular nerve innervates?

Answer 2

Origin: supraspinous fossa of the scapula
Insertion: greater tubercle of the humerus
Action: flex humeral joint (varies); abduct limb at humeral joint

Origin: infraspinous fossa of the scapula
Insertion: greater tubercle of the humerus
Action: flex the humoral joint; abduct the limb at humeral joint

Question 3

What is the OIA of the muscles that the subscapular nerve innervates?

Answer 3

Origin: subscapular fossa of scapula
Insertion: lesser tubercle of humerus
Action: adduct limb at humeral joint

Question 4

What is the OIA of the muscles that the musculocutaneous nerve innervates?

Answer 4

Origin: coracoid process of scapula

Origin: supraglenoid tubercle
Insertion: radial and ulnar tuberosities
Action: flex the cubital joint and extend the humeral joint

Origin: brachial groove of humerus
Insertion: proximal radius andulna
Action: flex the cubital joint

Question 5

What is the OIA of the muscles that the axillary nerve innervates?

Answer 5

ID only

Origin: caudal border of scapula
Insertion: teres major tuberosity of humerus
Action: flex the humeral joint

Origin: spine of the scapula and acromion
Insertion: deltoid tuberosity
Action: extend the humeral joint

Question 6

What is the OIA of the muscles that the thoracodorsal nerve innervates?

Answer 6

Origin: thoracolumbar fascia
Insertion: teres major tuberosity
Action: draw the thoracic limb caudally, flex or extend the humeral joint

Question 7

What is the OIA of the muscles that the radial nerve innervates?

Answer 7

Origin: lateral epicondyle of the humerus

Insertion: dorsal base of second and third metacarpal bones

Action: extend the carpal joints

Origin: lateral epicondyle of the humerus

Insertion: extensor processes of the distal phalanges

Action: extend the carpal and digital joints

Origin: lateral epicondyle of the humerus

Insertion: distal phalanges of lateral digit(s)

Action: extend the carpal and digital joints of the lateral-most digits

Question 8

What is the OIA of the muscles that the median nerve innervates?

Answer 8

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Question 9

What is the OIA of the muscles that the ulnar nerve innervates?

Answer 9

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Question 10

What is the OIA of the muscles that the caudal pectoral nerve innervates?

Answer 10

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Question 11

What is the OIA of the muscles that the lateral thoracic nerve innervates?

Answer 11

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