Axilla and Arm

Question 1

Name the five axillary lymph nodes

Answer 1

Apical, humeral, central, subscapular, pectoral

Question 2

Name the muscles of the arm

Answer 2

anconeus, biceps brachii, brachialis, coracobrachialis, triceps brachii

Question 3

Anconeus attachments

Answer 3

from the lateral epicondyle of the humerus to lateral surface of the olecranon process of the ulna

Question 4

anconeus action

Answer 4

extension of the elbow

Question 5

biceps brachii attachments

Answer 5

from coracoid process (short head) & supraglenoid tubercle (long head) of the scapula to the radial tubrosity and the deep antebrachial fascia (thru bicipital aponeurosis)

Question 6

anconeus innervation

Answer 6

radial nerve (C7-C8)

Question 7

biceps brachii actions

Answer 7

flexion of shoulder and elbow, & supination of forearm

Question 8

biceps brachii innervation

Answer 8

musculocutaneous nerve (C5-C6_

Question 9

brachialis attachments

Answer 9

from the distal anterior shaft of the humerus to lateral & medial intermuscular septa to the coronoid process (ulna) & ulnar tuberosity

Question 10

brachialis actions

Answer 10

flexion of elbow

Question 11

brachialis innervation

Answer 11

musculocutaneous & small branch from radial nerve (C5-6)

Question 12

coracobrachialis attachments

Answer 12

from the coracoid process to the proximal medial shaft of the humerus

Question 13

coracobrachialis actions

Answer 13

flexion and adduction of the shoulder

Question 14

coracobrachialis innervation

Answer 14

musculocutaneous nerve (C6-7)

Question 15

triceps brachii attachments

Answer 15

from the infraglenoid tubercle of the scapula (long head) & proximal posterolateral (lateral head) & distal posteromedial shaft of the humerus to the olcranon process of the ulna

Question 16

triceps brachii actions

Answer 16

Long head: extension of shoulder
long head, lateral and medial heads: extension of elbow

Question 17

triceps brachii innervation

Answer 17

radial nerve (C6-T1)

Question 18

What spinal segment is triceps brachii innervated by?

Answer 18

C6-T1

Question 19

What spinal segment is aconeus innervated by?

Answer 19

C7-8

Question 20

What spinal segment is biceps brachii innervated by

Answer 20

C5-6

Question 21

What spinal segment is brachialis innervated by

Answer 21

C5-6

Question 22

What spinal segment is coracobrachialis innervated by

Answer 22

C6-7

Question 23

What are the roots of the brachial plexus, and how many are there?

Answer 23

5 roots (C5-T1)
C5-C6
C7
C8-T1

Question 24

Name the trunks of the brachial plexus and the spinal roots they contain

Answer 24

Upper: C5-C6
Middle: C7
Lower: C8-T1

Question 25

What are the divisions of the brachial plexus?

Answer 25

anterior and posterior

Question 26

Name the cords of the brachial plexus

Answer 26

lateral, posterior, and medial

Question 27

What are the big 5 nerves off the brachial plexus?

Answer 27

axillary, radial (posterior cord) musculocutaneous (lateral cord) ulnar (medial cord) median (lateral cord and medial cord)

Question 28

The posterior cord is ____ to the axillary artery

Answer 28

posterior

Question 29

The medial cord is ____ to the axillary artery

Answer 29

medial

Question 30

The lateral cord is ____ to the axillary artery

Answer 30

lateral

Question 31

The axillary vein is ____ to the axillary artery

Answer 31

anterior

Question 32

What are the boundaries of the axilla?

Answer 32

Apex: 1st rib and clavicle Base: skin of the armpit Anterior: pectoral muscles Posterior: scapula, subscapularis Medial: thoracic wall, serratus anterior Lateral: humerus

Question 33

What are the contents of the axilla?

Answer 33

axillary artery, axillary vein, axillary lymph nodes, 3 cords of the brachial plexus (lateral, posterior, medial)

Question 34

What nerves come off the roots of the brachial plexus?

Answer 34

dorsal scapular (C4-5) long thoracic (C5-7)

Question 35

What are the functions of the dorsal scapular nerve?

Answer 35

postganglionic & motor to levator scapulae and rhomboids NOT sensory C4-5

Question 36

What are the functions of the long thoracic nerve?

Answer 36

postganglionic, motor, and sensory to serratus anterior muscle C5-7

Question 37

What nerves come off the upper trunk of the brachial plexus?

Answer 37

suprascapular nerve (C4-6) subclavian nerve (C5-6)

Question 38

What are the functions of the suprascapular nerve?

Answer 38

postganglionic, motor, and sensory innervation to supraspinatus (C4-6) and infraspinatus muscles (C5-6)

Question 39

What are the functions of the subclavian nerve?

Answer 39

postganglionic, motor and sensory innervation to the subclavius muscle (C5-6)

Question 40

The ____ _____ is the only trunk of the brachial plexus where nerves branch off of.

Answer 40

upper trunk

Question 41

The subclavian and suprascapular nn. branch off at the ____ _____.

Answer 41

upper trunk of brachial plexus (C4-6)

Question 42

What are the divisions of the brachial plexus?

Answer 42

anterior and posterior divisions, one from each trunk

Question 43

What are the 3 cords of the brachial plexus?

Answer 43

lateral, posterior, medial

Question 44

What nerves branch off at the lateral cord of the brachial plexus?

Answer 44

lateral pectoral n. (C5-7) musculocutaneous n. (C5-7) lateral root of the median n. (C5-7)

Question 45

What nerves branch off at the medial cord of the brachial plexus?

Answer 45

Medial pectoral nerve (C8-T1) Medial cutaneous nerves of the arm and forearm (C8-T1) Medial root of the median nerve (C8-T1) Ulnar nerve (C7-T1)

Question 46

What nerves branch off at the posterior cord of the brachial plexus?

Answer 46

Axillary n. (C5-6) Upper subscapular n. (C5-6) Lower subscapular n. (C5-6) Thoracodorsal n. (C6-8) Radial n. (C5-T1)

Question 47

The axillary nerve branches at the ______ ______ of the brachial plexus.

Answer 47

posterior cord

Question 48

The upper subscapular n. branches at the ______ ______ of the brachial plexus.

Answer 48

posterior cord

Question 49

The lower subscapular branches at the ______ ______ of the brachial plexus.

Answer 49

posterior cord

Question 50

The radial n. branches at the ______ ______ of the brachial plexus.

Answer 50

posterior cord

Question 51

The thoracodorsal branches at the ______ ______ of the brachial plexus.

Answer 51

posterior cord