Axilla and Brachial Plexus

Question 1

Coming immediately off of the C5 Root of the brachial plexus is the collateral nerve called _____ _____ (C5)

Answer 1

Dorsal Scapular

Question 2

The anterior muscles of the hand (palm) are mainly innervated by the terminal _____ nerve

Answer 2

Ulnar

“Give a high Palm Five to my aunt Ulna”

Question 3

Given that the Lateral antebrachial cutaneous nerve runs on the lateral end along with the radial bone, then the medial antebrachial nerve runs along the _____ bone of the arm

Answer 3

Ulnar

Question 4

What roots form the Upper brachial plexus trunk?

Answer 4

C5 and C6

Question 5

Looking at the arm in anatomic position, it makes perfect sense that the Lateral Antebrachial Cutaneous Nerve, innervates the _____ part of the arm, following the ____ bone

Answer 5

Lateral, Radial

Question 6

The Lateral and Medial cord of the brachial plexus contain only _____Divisions from their respective trunks

Answer 6

Anterior

Question 7

Deep to the Pectoralis Minor is the ______ artery

Answer 7

Axillary

Question 8

The Axillary sheath contains which four structures?

Answer 8

The axillary artery and the 3 cords of the brachial plexus

Question 9

The C6 dermatome and C8 dermatome are very notable in the hand because C6 innervates the _____ and C8 innervates the _____

Answer 9

Thumb, Pinky

Question 10

The medial pectoral Nerve innervates which of the Pectoralis Muscles?

Answer 10

BOTH of them

Question 11

The three muscles that make up the posterior wall of the Axilla are _____, ______, and _______

Answer 11

1. Subcapularis
2. Teres Major
3. Latissimus Dorsi

(“My friend Terry wears his cap laterally”)

Question 12

What are the Five spinal roots of the brachial plexus?

Answer 12

1. C5
2. C6
3. C7
4. C8
5. T1

“Start at the fifth for the five roots”

Question 13

The musculocutaneous terminal nerve (C5-C7) arises from the _____ cord

Answer 13

Lateral

Question 14

Given its origins, it makes sense that the radial nerve’s main Cutaneous Innervation of the arm is found along the ________ side, running along the arm, forearm, and hand.

Answer 14

Posterior side

Question 15

The median nerve has cord contributions from both the _____ and the ____

Answer 15

Medial and Lateral

Question 16

The Medial Wall of the axilla has the _____ ____ muscle

Answer 16

Serratus Anterior

Question 17

The posterior cord contains only ____ divisions from all the trunks

Answer 17

Posterior

Question 18

The Axillary cutaneous nerve is easy to visualize because on both the anterior and posterior it innervates the _____

Answer 18

Shoulder

Question 19

The three collateral nerves coming off of the Medial Cord of the Brachial Plexus all C8-T1

Answer 19

1. Medial Pectoral (C8-T1)
2. Medial Brachial Cut. (C8-T1)
3. Medial Antebrachial Cut. (C8-T1)

Question 20

What lucky root makes the middle trunk?

Answer 20

C7

Question 21

Which super cool nerve innervates all posterior muscles of the Arm and Forearm?

Answer 21

The Radical Radial (derived from posterior cord)

Question 22

The _____ artery runs from the border of the first rib to the border of the teres major

Answer 22

Axillary

Question 23

The Anterior and posterior rami contain both sensory and motor. Which rami are responsible for the Upper limbs?

Answer 23

The Anterior or Ventral Rami

(Recap: Posterior/Dorsal Rami innervate true back muscles)

Question 24

The Glenoid Fossa holds which bone?

Answer 24

The head of the Humerus
“Glen Loves Humour”

Question 25

The 3rd part of the axillary artery is made up of the _____ artery, ______ \_\_\_\_\_\_ _____ artery, and the _____ \_\_\_\_\_ ____ Artery

Answer 25

Subscapular, Anterior Humeral Circumflex Artery, Posterior Humeral Circumflex Artery

Question 26

The _____ nerves innervate proximal muscles such as the intrinsic shoulder muscles and axillary wall muscles

Answer 26

Collateral

Question 27

Each of the brachial plexus trunks has two division (anterior and posterior), the middle and upper trunk's anterior divisions make the ______ cord

Answer 27

Lateral

Question 28

What roots form the Lower brachial plexus?

Answer 28

C8 and T1

Question 29

The ______ Terminal nerve of the brachial plexus innervates all Anterior Muscles of the arm.

Answer 29

Musculocutaneous

Question 30

The first part of the axillary artery has one branch called the _______ \_\_\_\_\_\_\_ artery

Answer 30

Superior Thoracic Artery

Question 31

The suprascapular artery, dorsal scapular artery, and the posterior circumflex artery all go to the posterior to form an \_\_\_\_\_\_

Answer 31

Anastomosis

Question 32

Along the Lateral Wall of the Axilla, the Bicipital Groove can be found containing the _____ Tendon

Answer 32

Long tendon of the biceps

Question 33

Two muscles that make up the Anterior Wall of the axilla are the _____ and the \_\_\_\_\_\_

Answer 33

Pectoralis Major, Pectoralis Minor

Question 34

The motor innervation for the Deltoid and the Teres minor is accomplished by the _____ Nerve (Posterior division)

Answer 34

Axillary

Question 35

The Lateral Pectoral Nerves innervates which of the Pectoralis Muscles?

Answer 35

JUST the Pectoralis major

Question 36

The second part of the axillary artery has two branches called the ______ artery and the ______ \_\_\_\_ artery

Answer 36

Thoracoacromial Artery, Lateral Thoracic Artery "The second part is under the minor pec, so it loves the thorax"

Question 37

Using the words Lateral vs Medial and Arm vs Hand, describe the 5 Segmental innervations of the skin dermatomes for the upper limb

Answer 37

1. Lateral Arm 2. Lateral Arm and Hand (thumb & pointer) 3. Medial Arm and Hand (middle two fingers) 4. Lateral Arm and Hand (ring & beyond) 5. Lateral Arm

Question 38

Post plexus vs Pre-plexus lesion: 3 Key Facts

Answer 38

1. Infraclav=Post, SupraClav=Pre 2. Post-Plexus more likely to cause paralysis 3. Pre-plexus lesion more likely to cause weakness