Week 2 (Pectoral region and Brachial Plexus)

Question 1

Pectoralis major

Answer 1

2 heads: sternocostal head and clavicular head
Junction of the two heads is at the sternoclavicular joint
Medial attachment: medial aspect of clavicle, sternum, and costal cartilages of ribs 1-7
Lateral attachment: intertubercular groove of the humerus

Action: medially rotates, flexes and adducts the humerus

Innervation:
Lateral pectoral nerve medial to axillary area and under the clavicle
Medial pectoral nerve pierces pectoralis major and going into the pectoralis minor

Question 2

Pectoralis minor

Answer 2

Attaches superolaterally to coracoid process of the scapula and attaches to ribs 3-5

Action: anteriorly tilts the scapula and depress the scapula

Innervation: medial pectoral nerve

Question 3

Subclavian muscle

Answer 3

(inferior to the clavicle)

Action: depresses the clavicle and stabilizes the subclavian joint

Nerve: nerve to the subclavius

Attaches to the first rib and clavicle (pulls clavicle inferiorly)

Question 4

Intercostal Brachial Nerve (tickle nerve)

Answer 4

Originates from the second intercostal space and travels to floor of axilla

Sensory innervation for the armpit

Clinical relevance: when a female receives breast cancer surgery, this nerve can be injured when they perform lymph node samples from the axilla

Question 5

Axillary artery parts

Answer 5

subclavian
axillary
brachial

Question 6

Subclavian artery

Part 1

Answer 6

from lateral portion of the first rib under the clavicle to medial border of the pectoralis minor

Question 7

Subclavian artery branch

Answer 7

superior thoracic artery

Question 8

Axillary artery

part 2

Answer 8

from medial border of pec minor to the lateral portion of pec minor

Question 9

Axillary artery

branches

Answer 9

Thoracoacromial artery

Lateral thoracic artery

Question 10

what are the 4 branches of the thoracoacromial artery

Answer 10

pectoral, deltoid, acromial, and clavicular

Question 11

brachial artery

part 3

Answer 11

lateral aspect of pec minor to inferior border of teres major

Question 12

brachial artery branches

Answer 12

• subscapular artery
• anterior humeral circumflex artery
• posterior humeral circumflex artery

Question 13

2 branches of subscapular artery

Answer 13

• thoracodorsal artery

- circumflex scapular artery

Question 14

cephalic vein

Answer 14

superior aspect of axilla and shoulder

Question 15

basilic vein

Answer 15

large superficial vein of upper limb that drains part of hand and forearm

Question 16

median cubital vein

Answer 16

where the basilic and cephalic vein meet

used for taking blood

Question 17

medial cutaneous nerve of forearm

Answer 17

provides sensory innervation of forearm

Question 18

lactiferous duct

Answer 18

small ductal structure deep to the nipple

Question 19

glandular tissue

Answer 19

distal to lactiferous duct

where milk is made

Question 20

suspensory ligaments

Answer 20

holds breasts up

Question 21

M structure: brachial plexus

Cords?

Answer 21

Lateral
Median
Posterior

Question 22

Lateral cord

Answer 22

lactoral pectoral nerve
musculocutaneous nerve
median nerve

Question 23

Medial cord

Answer 23

medial pectoral nerve
median nerve
ulnar nerve

Question 24

posterior cord of brachial plexus

Answer 24

upper subscapular nerve
thoracodorsal nerve
lower subscapular nerve
axillary nerve
radial nerve

Question 25

Coracobrachialis

attachment

function

innervation

Answer 25

Attaches to coracoid process of the scapula and continues distally to the medial shaft of the humerus

Innervated by the musculocutaneous nerve

Flexes shoulder joint

Question 26

Biceps Brachii

attachment

function

Answer 26

Short head attaches to coracoid process

Long head attaches to the supraglenoid tubercle of the scapula

Both continue distally to bicipital aponeurosis and radial tuberosity on the radius
Flexes arm

Question 27

Brachialis

Answer 27

Attaches to the anterior surface of the humerus

Continues distally on the tuberosity of the ulna and coronoid process distally

Flexes arm

Question 28

Branches of the Brachial artery

Answer 28

Deep brachial artery
Superior ulnar collateral
Inferior ulnar collateral