Final Myology

Question 1

What is the muscle on the lateral aspect of rib cage? What nerve innervates it, and what is it’s function?

Answer 1

Serratus Anterior

Long Thoracic Nerve (C5,6,7 keep the wing from heaven)

Protract scapula and stabilize it against thoracic wall and rotate glenoid cavity superiorly

Question 2

What is this muscle, innervation and action, and insertion?

Answer 2

Deltoid

Axillary Nerve (C5,6 terminal branch posterior cord)

Anterior part flexes and medially rotates humerus, middle ABduct, Posterior extends and laterally roatates humerus

Question 3

What is this muscle, action, innervation?

Answer 3

Subscapularis

ADduct, medially rotate humerus (rotator cuff muscle, so also holds humerus in glenoid cavity)

Suprascapular Nerve (C5,C6)

Attaches to lessser tubercle of humerus

Question 4

What is this muscle, action, innervation?

Answer 4

Supraspinatus, greater tubercle of humerus attachment

ABduct humerus with the Deltoid, rotator cuff so holds head in place

Suprascapular nerve (C5,6)

Question 5

what is the yellow muscle, action, innervation?

Answer 5

Infraspinatus

greater tubercle of humerus

Laterally rotates humerus, holds humeral head in cavity (rotator cuff)

Suprascapular Nerve

Question 6

what is the purple muscle, action, innervation, insertion?

Answer 6

Teres Minor (rotator cuff)

Greater tubercle

Laterally rotate humerus hold head in cavityy

axillary nerve

Question 7

Blue muscle, innervation, action, insertion?

Answer 7

Teres Major

ADduct, Medially rotate humerus

Lower subscapular Nerve

Intertubercular groove humerus

Question 8

Yellow muscle, action, innervation insertion?

Answer 8

Biceps Brachii

• Flex humerus, flex and supine forearm, supinate forearm, short head resists dislocation of shoulder
• Short head comes from coracoid process
• Longhead comes from supraglenoid tubercle of scapula
• Insertion is radial tuberosity and antebrachial fascia as bicepital aponeurosis
• Musculocutaneous Nerve

Question 9

What is the yellow muscle, action, innervation, attachments?

Answer 9

Coracobrachialis

• Coracoid process and Medial aspect of humerus
• Flex and ADduct
• Musculocutaneous Nerve

Question 10

Answer 10

Triceps

• Long head crosses shoulder joint from the infraglenoid tubercle
• Lateral head posterior aspect of humeral body superiorly to radial groove
• Medial head posterior aspect of humeral body i nferior to radial groove
• extend at shoulder and extend forearm
• Radial nerve

Question 11

Yellow muscle, action, innervation, attachment

Answer 11

Anconeus

• lateral humeral condyle and olecranon
• radial nerve
• helps triceps extend forarm and stabilize elbow joint

Question 12

Yellow muscle, innervation, action

Answer 12

Pronator teres

Question 13

Answer 13

FDS

not to distal phalynx

Question 14

What is the muscle, action, innervation

Answer 14

FDP

Flex wrist and hand goes to distal phalanges

medial half is ulnar nerve lateral half is median nerve

Question 15

muslce action innervation

Answer 15

Flexor pollicis longus

• flex hand flex and abduct first metacarpal at first carpometacarpal joint, flex phalanges of pollux
• Nerve is anterior interosseous nerve of the median nerve
• anterior aspect radius and interosseous mem and thumb