Pectoral Region

Question 1

Attachments of each art of the deltoid:
Clavicular
Acromial
Spinal

Answer 1

Clavicular originates for the lateral one third of the clavice
Acromial orginates from the acromion
Spinal part orginates from the scapular spine

All attach to the deltoid tuberosity of the humerus

Question 2

What is the innervation of the deltoid?

Answer 2

Axillary nerve (C5-C6)

Question 3

What is the action of the deltoid?

Answer 3

Clavicular- Flex, internally rotate and adduct the arm at the shoulder
Acromial- extend externally rotate, and adduct the arm at the shoulder
Spinal- extend, externally rotate, and adduct the arm at the shoulder

Question 4

Which vein is found in the deltopectoral groove?

Answer 4

Cephalic vein

Question 5

What are the three parts of the pectoralis major?

Answer 5

Clavicular, sternocostal and abdominal

Question 6

Where does the clavicular part of the pec major attach?

Answer 6

From the medial half of the clavicle and greater tuberosity of the humerus

Question 7

Where does the sternocostal part of the pec major attach?

Answer 7

From the sternum and costal cartilages 1-6 and greater tuberosity of the humerus

Question 8

Where does the abdominal part of the pec major attach?

Answer 8

The anterior layer of the rectus sheath and the greater turberosity of the humerus

Question 9

What innervates the pectoralis major?

Answer 9

Medial and lateral pectoral neves (C5-T1)

Question 10

Where do all three parts of the pectoralis major attach?

Answer 10

Inserts onto the crest of the greater tuberosity of the humerus

Question 11

What is the action of the pectoralis major?

Answer 11

All three parts act to adduct and internally rotate the arm at the shoulder.
The clavicular and sternocostal part act to flex the arm at the shoulder and assist in respiration when the shoulder is fixed.

Question 12

Where does the pectoralis minor attach

Answer 12

Coracoid process of the scapula and the 3rd and 5th ribs

Question 13

What innervates the pec minor?

Answer 13

Medial pectoral nerve

Question 14

How can you tell the difference between the medial and lateral pectoral nerves?

Answer 14

Medial pectoral nerve pierces both pec major and pec minor. Lateral pectoral nerve does not.

Question 15

What is the action of pectoralis minor?

Answer 15

Acts to draw the scapula downward, causing the inferior angle to move posteriomedially. Also acts to rotate the glenoid inferiorly and assist in respiration.

Question 16

The axially artery branches into three parts. Where is the first part located and what is its one branch?

Answer 16

Extends from the lateral edge of the first rib to the medial border of the muscle.
The branch is the superior thoracic artery

Question 17

The axially artery branches into three parts. Where is the second part located and what are its two branches?

Answer 17

Lies under the pec minor

Its two branches are the thoracoacromial artery and the lateral thoracic artery.

Question 18

The axially artery branches into three parts. Where is the third part located and what are its three branches?

Answer 18

Extends from the lateral margin of the muscle down to where the artery crosses the tendon of the teres major.
Its branches are the anterior and posterior circumflex humeral arteries and the subscapular artery.

Question 19

Where does the coracobrachialis attach?

Answer 19

Coracoid process of the scapula and crest of lesser tuberosity of the humerus

Question 20

Where does the subclavius muscle attach?

Answer 20

First rib and interior surface of the clavicle

Question 21

What innervates the coracobrachialis?

Answer 21

Musculocutaneous nerve

Question 22

What innervates the subclavius muscle?

Answer 22

Subclavian nerve

Question 23

Where does the supraspinatus attach?

Answer 23

Supraspinous fossa of the scapula and greater tuberosity of the humerus

Question 24

What innervates the supraspinatus?

Answer 24

Suprascapular nerve

Question 25

Where does the infraspinatus attach?

Answer 25

Infraspinous fossa of the scapula and the greater tuberosity of the humerus

Question 26

What innervates the supraspinatus?

Answer 26

Suprascapular nerve

Question 27

Where does the teres minor attach?

Answer 27

Lateral border of the scapula and the greater tuberosity of the humerus

Question 28

What innervates the teres minor?

Answer 28

Axillary nerve

Question 29

Where does the subscapularis attach?

Answer 29

Subscapular fossa and lesser tuberosity of the humerus

Question 30

What innervates the subscapularis?

Answer 30

The upper and lower subscapular nerves

Question 31

Where does the teres major attach?

Answer 31

Inferior angle of scapula and crest of lesser tuberosity of humerus

Question 32

What innvervates teres major?

Answer 32

Lower subscapular nerve