Nerves and Vessels UL

Question 1

Name the 5 segments of the brachial plexus, proximal to distal

Answer 1

• Roots (anterior rami C5 to T1)
• Trunks
• Divisions
• Cords
• Terminal Branches

Question 2

Name the 3 trunks of the brachial plexus, and list the roots that communicate with each

Answer 2

Superior Trunk: C5/C6

Middle Trunk: C7

Inferior Trunk: C8/T1

Question 3

Each of the 3 trunks branch distally into two ____:
____ and ____.

Answer 3

Divisions: Posterior and Anterior

Question 4

Name the 3 cords, and list their contributors

Answer 4

Posterior Cord: 3 Posterior divisions

Lateral Cord: Anterior divisions of the Superior and Middle Trunks

Medial Cord: Anterior division of the Inferior Trunk

Question 5

What are the terminal branches of the Posterior Cord?

Answer 5

Axillary n., Radial n.

Question 6

What terminal branch is formed by portions of the Lateral and Medial Cords?

Answer 6

Lateral Cord: Musculocutaneous n.

Parts of both: Median n.

Medial Cord: Ulnar n.

Question 7

Axillary n.

(Motor, Cutaneous, Anatomy)

Answer 7

Motor
Deltoid, Teres Major

Cutaneous
superficial to deltoid

Anatomy
surgical neck of humerus

Question 8

Radial n.

(Motor, Cutaneous, Anatomy)

Answer 8

Motor
Triceps, all posterior forearm

Cutaneous
Posterior arm, posterior forearm, lateral 3.5 digits (excpt. dorsal tips)

Anatomy
between lateral and medial head of triceps

Question 9

Musculocutaneous n.

(Motor, Cutaneous, Anatomy)

Answer 9

Motor
all anterior arm

Cutaneous
lateral forearm

Anatomy
pierces coracobrachialis m., deep to bicps br.

Question 10

Median n.

(Motor, Cutaneous, Anatomy)

Answer 10

Motor
anterior forearm mm. (except Flx Carpi Uln. & medial 1/2 of Flx Digi Prof.), Thenars, lateral 2 Lumbricals

Cutaneous
2/3 of palm plus 3.5 dorsal tips

Anatomy
cubital fossa, carpal tunnel

Question 11

Ulnar n. (Motor, Cutaneous, Anatomy)

Answer 11

Motor
Flexor Carpi Ulnaris, medial 1/2 of Flexor Digitorum Profundus

Cutaneous
medial 1.5 digits

Anatomy“funny” bone, posteriorly to medial epicondyle, superficial to carpal tunnel

Question 12

Possible symptoms of damage to Radial n.

Answer 12

Decreased extension ability at elbow, wrist (“wrist drop”), and thumb

Question 13

Possible symptoms of damage to Axillary n.

Answer 13

Decreased abduction ability at shoulder, overall shoulder weakness

Question 14

Possible symptoms of damage to Musculocutaneous n.

Answer 14

Loss of function in biceps br. m. and brachialis m., affecting flexion and supination at the elbow

Question 15

Possible symptoms of damage to Median n.

Answer 15

Deficit in hand grip and/or thumb opposition

Question 16

Fracture in surgical neck of humerus: what nerve could be damaged, and how would you check?

Answer 16

Axillary n.

Check cutaneous sensation superficial to deltoid

Question 17

Fracture in midldle shaft of humerus: what nerve could be damaged, and how would you check?

Answer 17

Median n. or Ulnar n.

Check cutaneous sensation on medial and lateral dorsal hand; check movement of fingers and wrist

Question 18

From where does the Right Subclavian a. branch?

Answer 18

Brachiocephalic Trunk (< aortic arch)

Question 19

What is the path of each Subclavian artery?

Answer 19

Under the clavicle to Rib 1.

Beyond Rib 1 it is called the Axillary a.

Question 20

What is the path of the Axillary a.?

Answer 20

From Rib 1 (Subclavian a.) to Teres Major m.

Beyond Teres Major m. it is called the Brahial a.

Question 21

What are the borders and contents of the Cubital Fossa?

Answer 21

Borders
Brachioradialis m. and Pronator Teres

Contents
Biceps brachii tendon, Brachial a., Median n.
(TAN, lateral to medial)

Question 22

Brachial artery branches where and into what?

Answer 22

Inferior to Cubital Fossa: Radial a., Ulnar a.

Question 23

In what layer of the upper limb do the superficial veins run?

Answer 23

Hypodermal, outside the deep fascia

Question 24

Name the deep vein pairs of the upper limb

Answer 24

Radial vv., Ulnar vv., Brachial vv.

Question 25

Name the superficial veins of the upper limb

Answer 25

Basilar v. (medial), Cephalic v. (lateral), Median Cubital v.

Question 26

What are the borders and contents of the Carpal Tunnel?

Answer 26

Borders
Flexor retinaculum, anterior surfaces of carpals

Contents
Median n.
Tendons of:
Flexor Digitorum Superficialis
Flexor Digitorum Profundus
Flexor Carpi Radialis

Question 27

What are the borders and contents of the Anatomical Snuffbox?

Answer 27

Borders
Two sides: tendons of extensors pollicis longus and brevis; Floor: Scaphoid

Contents
Radial a.