Muscles of The Upper Limb

Question 1

muscle groups in the upper limb

Answer 1

1. Muscles connecting Upper Limb with Thoracic wall (muscles of pectoral region)
2. Muscles connecting Upper Limb with Vertebral column ((back muscles*)
3. Muscles connecting Scapula with humerus (muscles of the shoulder region)
4. Muscles of The arm (Anterior & Posterior)
5. Muscles of The Forearm (Anterior & Posterior)
6. Muscles of The Hand

Question 2

Muscles of the pectoral region

Answer 2

1. Pectoralis Major
2. Pectoralis Minor
3. Serratus Anterior

Question 3

Pectoralis Major origin and insertion

Answer 3

origin:
clavicular head (anterior border of medial ⅔ of clavicle)
sternocostal head (Anterior surface of sternum, The upper 6 costal cartilages)
insertion: Lateral lip of the bicipital groove

Question 4

pectoralis major nerve supply

Answer 4

medial and lateral pectoral nerves

Question 5

pectoralis major actions

Answer 5

1. adduction and medial rotation of the arm
2. flexion of the arm
3. The sternocostal head, with the arm raised and fixed, can raise the trunk as in climbing

Question 6

**All Muscles Attached to Bicipital groove*

Answer 6

Adduct and Medially rotate the arm

Question 7

Pectoralis Minor Origin and insertion

Answer 7

Origin: from outer surfaces of 3rd, 4tg and 5th ribs close to their costal cartilages
Insertion: Coracoid process of the scapula

Question 8

Pectoralis minor nerve supply

Answer 8

medial pectoral nerve

Question 9

Pectoralis Minor action

Answer 9

1. Protraction of the scapula
2. Depression of the shoulder
3. If the scapula is fixed, it elevates the ribs

Question 10

Serratus Anterior Origin and Insertion

Answer 10

Origin: the side of the chest from the upper 8 ribs (6?)
insertion: the entire length of the anterior aspect of the medial border of the scapula

Question 11

Serratus Anterior nerve supply

Answer 11

nerve to surratus anterior (long thoracic nerve)

Question 12

Action of Serratus Anterior

Answer 12

1. Protraction of the scapula
2. rotation of the scapula upward during raising the arn above the head

Question 13

Serratus Anterior Paralysis

Answer 13

also known as winging of the scapula

Question 14

what are the muscles connecting the upper limb with vertebral column

Answer 14

trapezius and the latissimus dorsi

Question 15

trapezius nerve supply and action

Answer 15

nerve supply: Spinal accessory nerve
action: elevates the shoulder

Question 16

latissimus dorsi nerve supply and actions

Answer 16

nerve supply: thoracodorsal nerve
actions:
1. adduction and medial rotation
2. extension of the arm
(swimming)

Question 17

what muscles connect the scapula with humerus

Answer 17

muscles of the shoulder:
deltoid
supraspinatus
subscapularis

Question 18

deltoid nerve supply and actions

Answer 18

nerve supply: axillary nerve
action: middle fibers Abductor of the arm (15⁰ -90⁰)

Question 19

symptoms of deltoid muscle paralysis

Answer 19

atrophy of the shoulder
unable to abduct the arm to 90⁰

Question 20

supraspinatus nerve supply and actions

Answer 20

nerve supply: suprascapular nerve
action: initiates abduction of the arm (from 0-15⁰)

Question 21

subscapularis nerve supply and actions

Answer 21

nerve supply: upper amd lower subscapulaf nerves
action: adduction and medial rotation of the arm

Question 22

muscles of the arm

Answer 22

front: (bbc)
1. corachobrachialis
2. Biceps Brachii
3. Brachialis
they are all supplied by Musculotaneous nerve and they are flexors
Back:
Triceps
Its supplied by radial nerve, and it is an extensor

Question 23

coracobrachialis nerve supply and action

Answer 23

nerve supply: musculocutaneous nerve
action: flexion of the arm

Question 24

biceps brachii has 2 heads (?)

Answer 24

short (medial) head
long (lateral) head [with the capsule of the shoulder joint]

Question 25

nerve supply and actions of biceps brachii

Answer 25

nerve supply: musculocutaneous nerve
actions:
1. Flexion of the arm
2. Flexion of the elbow
3. Supinator of the semi-flexed forearm

Question 26

Brachialis nerve supply and action

Answer 26

nerve supply: musculocutaneous nerve (its lateral fibers are supplied by the radial nerve)
action: main flexor of the forearm

Question 27

the Triceps brachii has 3 heads (?)

Answer 27

long, lateral and medial heads

Question 28

triceps brachii nerve supply and action

Answer 28

nerve supply: radial nerve
action: main extensor of the forearm