Practical topic 14

Question 1

N. medianus

Where does it arise from?

Answer 1

C8 and T1 (T2) spinal nerves, by common trunk with n. ulnaris (cranial division)

Question 2

N. medianus

Where does it run

Answer 2

• Runs next to a. brachialis → a. mediana
• Runs towards the antebrachium

Question 3

N. medianus

From what nerve does it recive branches from?

Answer 3

Receives branch from n. musculocutaneous

Question 4

N. medianus

Which muscles does it innervate?

Answer 4

Most flexor muscles of carpus and digits

Question 5

N. ulnaris

Where does it arise from?

Answer 5

C8 and T1 (T2) spinal nerves, by common trunk with n. mediana (caudal division)

Question 6

N. ulnaris

Where does it run?

Answer 6

• Run caudally of n. musculocutaneous and n. medianus
• Crosses elbow caudal to medial epicondyle of the humerus (epicondylus medialis humeri)

Question 7

N. ulnaris

Which branches does it give off?

Answer 7

Gives off caudal cutaneous antebrachial nerve near the middle arm

Question 8

N. ulnaris

Which muscles does it innervate?

Answer 8

• M. flexor carpi ulnaris
• M. flexor digitalis superficialis
• M. flexor digitalis profundus

(flexors of digit IV and V)

Question 9

N. radialis

Where does it arise from?

Answer 9

C7-T1(2) spinal nerves

Question 10

N. radialis

What type of nerve?

Answer 10

Motor nerve

Question 11

N. radialis

Where does it run?

Answer 11

Runs caudally to a. brachialis (along with n. mediana and n. ulnaris) → enters space between m. triceps brachii and humerus (distal to m. teres major)

Runs on m. brachialis (follows sulcus brachialis), goes over lateral side

Question 12

N. radialis

Which branches does it divide into?

Answer 12

• N. radialis profundus
• N. radialis superficialis
  
  • Runs along with v. cephalica

Question 13

N. radialis

Which muscles does it innervate?

Answer 13

• All extensors of the elbow (m. triceps brachii)
• Carpal and phalangeal extensors

Question 14

N. musculocutaneous

Where does it arise from?

Answer 14

C7-C8 spinal nerves (car, eq)

Question 15

N. musculocutaneous

What type of nerve?

Answer 15

Sensory nerve

Question 16

N. musculocutaneous

Where does it run?

Answer 16

• Runs medial to shoulder joint and joins n. medianus
• Between biceps (cranial) and brachial vessels (caudal)

Question 17

N. musculocutaneous

Which branches does it give off?

Answer 17

Medial cutaneous antebrachial nerve (usually removed with the skin)

Question 18

N. musculocutaneous

Which muscles does it innervate?

Answer 18

• M. coracobrachialis
• M. bicpes brachii
• M. brachialis

Question 19

A. brachialis

Branches

Answer 19

1. (A. circumflexa humeri cranialis ??)
2. A. profunda brachii
3. A. bicipitalis
4. A. collateralis ulnaris
5. A. brachialis superficialis
6. A. transversa cubiti
7. (A. interossea communis ???)

Question 20

A. profunda brachii

Which muscles does it supply?

Answer 20

M. triceps brachii

Question 21

A. bicipitalis

Which muscles does it supply?

Answer 21

• M. biceps brachii (enters distally)
• Small branches to:
  
  • M. coracobrachialis
  • Elbow joint

Question 22

A. collateralis ulnaris

Which muscles does it supply?

Answer 22

• M. triceps brachii
• Olecranon
• N. ulnaris

Question 23

A. transversa cubiti

Which muscles does it supply?

Answer 23

Elbow and adjacent muscles

Question 24

A. transversa cubiti

Which vessel does it anastomose with?

Answer 24

A. interossea cranialis

Question 25

Answer 25

1. A. axillaris 2. **A. brachialis** 3. **A. brachialis profunda** 4. **A. bicipitalis** 5. **A. brachialis superficialis** 6. **A. ulnaris collateralis** 7. **N. musculocutaneous** * Innervates m. biceps brachii 8. M. biceps brachii 9. **N. mediana** 10. **N. ulnaris** 11. **Caudal cutaneous antebrachial nerve** 12. **N. radialis** 13. N. axillaris 14. N. thoracodorsalis 15. N. thoracica lateralis * \* V. cubiti mediana

Question 26

Caudomedial view of brachium

Answer 26

1. **A. brachialis** 2. A. circumflex humeri cranialis * Belongs to a. axillaris 3. **A. bicipitalis** 4. M. biceps brachii 5. **A. brachialis superficialis** 6. **A. ulnaris collateralis** 7. **N. musculocutaneous** 8. **N. mediana** 9. **N. ulnaris** 10. **N. thoracodorsalis** 11. **N. axillaris** 12. N. suprascapularis

Question 27

Answer 27

1. **N. musculocutaneous** 2. M. coracobrachialis * Innervated by n. musculocutaneous 3. M. biceps brachii * Innervated by n. musculocutaneous 4. M. brachialis * Innervated by n. musculocutaneous 5. **Communicating branch from n. musculocutaneous** 6. **N. antebrachii** 7. **N. mediana** 8. **N. ulnaris** 9. **Common trunk of n. mediana and n. ulnaris** 10. **Caudal cutaneous antebrachial nerve** 11. N. radialis 12. N. Thoracodorsalis * \* Branches of the n. axillaris

Question 28

Craniomedial view of the brachium

Answer 28

1. **N. musculocutaneous** 2. M. coracobrachialis * Innervated by n. musculocutaneous 3. M. biceps brachii * Innervated by n. musculocutaneous 4. M. brachialis * Innervated by n. musculocutaneous 5. Communicating nerve to n. mediana from n. musculocutaneous 6. Medial cutaneous antebrachial nerve 7. **N. mediana** 8. **N. ulnaris** 9. **Common trunk for n. mediana and n. ulnaris** 10. **Caudal caudal cutaneous antebrachial nerve** 11. **N. radialis** 12. N. thoracodorsalis