MSK 1.1 - Pectoral Region, Axilla And Brachial Plexus Flashcards Preview

ESA 2 > MSK 1.1 - Pectoral Region, Axilla And Brachial Plexus > Flashcards

Flashcards in MSK 1.1 - Pectoral Region, Axilla And Brachial Plexus Deck (43):
1

What are the 5 origin points of the pectoralis major?

- Medial half of clavicle
- Manubrium
- Body of sternum
- Costal cartilage of ribs 1-6
- Anterior layer of rectus sheath

2

Where is the insertion point of the pectoralis major?

Crest of greater tubercule of humerus

3

What is the nerve supply of the pectoralis major?

- Medial and lateral pectoral nerves
- Brachial plexus (C5, T1)

4

What are the actions of the pectoralis major?

Adduction, medial rotation and Flexion of the humerus

5

What is the shape and size of the pectoralis minor?

Small and triangular

6

What are the origin points of the pectoralis minor?

Ribs 3,4 and 5

7

What is the insertion point of the pectoralis minor?

Coracoid process of the scapula

8

What is the nerve supply of the pectoralis minor?

Medial and lateral pectoral nerves (C6, T1)

9

What is the action of the pectoralis minor?

Pulls scapula medially, forwards and downwards

10

What is the shape and size of the serratus anterior?

Fan shaped and small

11

What are the origin points of the serratus anterior?

- Superior section = 1st and 2nd ribs
- Intermediate section = 2nd and 3rd ribs
- Inferior section = 4th and 9th ribs

12

What is the insertion point of the serratus anterior?

Medial margin of the costal surface of scapula

13

What is the nerve supply of the serratus anterior?

- Long thoraic nerve
- Brachial plexus (C5-C7)

14

What are the actions of the serratus anterior?

- Superior external rotation of scapula which moves scapula internally and forward therefore lowering the arm

- Lifts ribs

15

What is the axilla and where is it located?

- Pyramidal shaped space

- Underneath shoulder and between thorax and upper limb

16

What makes up the medial border of the axilla?

- Rib

- Serratus Anterior

17

What makes up the anterior border of the axilla?

- Pectoralis major
- Pectoralis minor

18

What makes up the lateral border of the axilla?

Intertubecular grooves of humerus

19

What makes up the posterior border of the axilla?

- Scapula
- Subscapularis
- Latissimus Dorsi
- Teres major

20

What does the axilla contain? (6)

- Cords of brachial plexus
- Axillary vein and artery
- Short head of biceps brachi
- Coracobrachialis
- Tendons of muscles attaching to scapula
- Axillary lymph nodes

21

What is the order of sections in the brachial plexus?

- Branches
- Cords
- Divisions
- Trunks
- Roots

(BIG COCKS DO TOUCH RIGHT)

22

What is the order of nerves in the brachial plexus?

- Musculocutaneous
- Axillary
- Radial (behind median)
- Median
- Ulnar

MARMU

23

Where does the Musculocutaneous nerve originate?

C5, C6, C7 (cervical)

24

Where does the Axillary nerve originate?

C5, C6 (cervical)

25

Where does the median nerve originate?

C5 - T1 (cervical to thoraco)

26

Where does the radial nerve originate?

C5 - T1 (cervical to thoraco)

27

Where does the ulnar nerve originate?

C8, T1 (cervical, thoraco)

28

What does the Musculocutaneous nerve innervate? (3)

- Biceps brachi
- Brachialis
- Coracobrachialis

(The BBC)

29

What does the Axillary nerve innervate? (2)

- Deltoid
- Regimental badge (area of skin)

30

What does the median nerve innervate? (1)

Lumbricals of the hand

31

What does the radial nerve innervate? (4)

- Skin in posterior forearm
- Dorsal surface of lateral palm
- Triceps brachi
- Majority of extensor muscles

32

What does the ulnar nerve innervate? (1)

The muscles of the hand

33

What are the three sections of the cords?

- Lateral

- Posterior

- Medial

34

Which nerves branch from the lateral section of the cords?

- medial and lateral pectoral nerves

35

Which nerves branch from the posterior section of the cords?

There are three:

- middle = thoracodorsal nerve
- outer = upper and lower subscapular nerves

36

What are the nerves that branch from the medial section of the cords?

There are three, read right to left:

- medial and lateral pectoral nerves
- medial cutaneous nerve of the arm
- medial cutaneous nerve of the forearm

37

What are the three sections of the trunks of the brachial plexus?

- superior (C5 and C6)

- middle (C7)

- inferior (C8 and T1)

38

Which nerves branch of the superior section of the trunks?

- Suprascapular

- Nerve to subclavius

39

What is Erb's Palsy and how is it caused?

- Damage to roots C5 and C6 due to too big of an angle increase between neck and shoulder

- Upper brachial plexus injury

40

What are the effects of Erb's palsy?

- 'Waiter's tip'

- Loss of sensation on anterior arm

41

What is klumpke's palsy and how is it caused?

- Damage to nerves from T1 root upwards due to excessive abduction

- Lower brachial plexus injury

42

What are the effects of klumpke's palsy?

- Paralysis of small muscles in hand

- Sensory loss on medial side of arm

43

What is the shape of the pectoralis major?

Large and triangular

Decks in ESA 2 Class (63):