Muscles (the upper extremity)

Question 1

Muscles that cross in front of shoulder help w/ shoulder:

Answer 1

Flexion

Question 2

Muscles that cross over shoulder help w/ shoulder:

Answer 2

Abduction

Question 3

Muscles of the shoulder girdle will have origins and insertions between:

Answer 3

clavicle, scapula, thorax
- EXCEPT: pec maj. + lat. dorsi

Question 4

Muscles of the shoulder have origins and insertions between:

Answer 4

clavicle, scapula, humerus

Question 5

What are the muscles of the ant. shoulder girdle:

Answer 5

• pec minor
• serratus ant.
• subclavius
• pec. major (also a shoulder muscle)

Question 6

muscles of post. shoulder girdle

Answer 6

• Rhomboideus major
• rhomboideus minor
• levator scapula
• trapezius
• lat dorsi (also a shoulder muscle)

Question 7

Muscles of the shoulder: superior

Answer 7

Supraspinatus, middle deltoid

Question 8

Muscles of the shoulder: inferior

Answer 8

teres major, lat dorsi, long head of triceps brachii

Question 9

Muscles of the shoulder: posterior

Answer 9

post. deltoid, teres minor, infraspinatus

Question 10

muscles of the shoulder: anterior

Answer 10

pec major, coracobrachialis, subscapularis, ant. deltoid, long head of biceps brachii

Question 11

Rotator cuff

Answer 11

supraspinatus, infraspinatus, teres minor, subscapularis

Question 12

Muscles of the arm:

Answer 12

ant: biceps brachii, brachialis, coracobrachialis
post: triceps brachii

Question 13

Muscles of forearm proximal vs distal ends

Answer 13

Proximal end: bulky (muscle bellies)
Distal end: Thin (muscle tendons)

Question 14

Muslces of the forearm (actions)

Answer 14

Anterior: flexors and pronators
Post: extensors and supinators

Question 15

Muscles of the anterior forearm are innervated by:

Answer 15

median n.
(except flexor carpi ulnaris: ulnar n., and flexor digitorum profundus: median + ulnar n.)

Question 16

Ant. muscles of forearm: superficial (5)

Answer 16

• pronator teres
• flexor carpi radialis
• palmaris longus
• flexor digitorum superficialis
• flexor carpi ulnaris

Question 17

Ant. muscles of forearm: deep (3)

Answer 17

• Flexor digitorum profundus
• Flexor pollicis longus
• pronator quadratus

Question 18

Muscles of post. forearm are innervated by:

Answer 18

radial n.

Question 19

Action of muscles of post. forearm:

Answer 19

Extensors of wrist + fingers
(Except: brachioradialis (flexor))

Question 20

Post. muscles of forearm: superficial (6)

Answer 20

• Extensor Carpi Radialis Longus
• Extensor Carpi Radialis Brevis
• Extensor Digitorum
• Extensor Digiti Minimi
• Extensor Carpi Ulnaris
• Anconeus

Question 21

Post. muscles of forearm (5)

Answer 21

• Extensor Pollicis Longus
• Extensor Pollicis Brevis
• Abductor Pollicis Longus
• Extensor Indicis
• Supinator

Question 22

What are the muscles around the anatomical snuffbox?

Answer 22

• Extensor Pollicis Longus
• Extensor Pollicis Brevis
• Abductor Pollicis Longus

Question 23

What are the contents of the anatomical snuffbox?

Answer 23

Radial artery, base of scaphoid b., and trapezium b.

Question 24

Extrinsic muscles of the hand meaning.

Answer 24

muscles of the forearm that insert in the hand

Question 25

Intrinsic muscles of the hand meaning.

Answer 25

Muscles that originate and insert within the hand

Question 26

What are the 3 groups of intrinsic hand muscles?

Answer 26

1. Lateral = Thenar eminence 2. Medial = Hypothenar eminence 3. Palmar aspect = Deep palmar muscles

Question 27

What are the muscles in the thenar eminence of the hand?

Answer 27

- Abductor pollicis brevis - Flexor pollicis brevis - opponens pollicis (transverse and oblique heads)

Question 28

What is the innervation of the thenar eminence?

Answer 28

median n. (EXCEPT; adductor pollicis: ulnar n.)

Question 29

What are the muscles of the hypothenar eminence of the hand?

Answer 29

- Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi

Question 30

What is the innervation of the hypothenar eminence?

Answer 30

ulnar n.

Question 31

What are the muscles of the palm?

Answer 31

1. Dorsal interossei 2. Palmar interossei 3. Lumbricals

Question 32

What is the innervation of dorsal and palmar interossei?

Answer 32

ulnar n.

Question 33

Describe dorsal interossei m.

Answer 33

- 4 - originate from both sides of metacarpals - insert on proximal phalanges 2,3,4 - 1st: dorsal webbing - abducts fingers

Question 34

Desbribe palmar interossei m.

Answer 34

- 3 - Originate from medial side of metacarpals - insert on proximal phalanges 2,4,5 - #1: not always present (fourth one) - Adducts fingers

Question 35

What is the innervation of lumbricals m.

Answer 35

#1 and #2: median n. #3 and #4: ulnar n.

Question 36

Describe lumbricals m.

Answer 36

- 4 - Orginate on tendons of flexor digitorum profundus - insert into extensor expansion 2-5