Muscles of the Brachium

Question 1

what are the 3 muscles of the anterior compartment of the brachium?

Answer 1

1) Biceps Brachii
2) Brachialis
3) Coracobrachialis

Question 2

What are the 2 muscles of the posterior compartment of the brachium?

Answer 2

1) Triceps Brachii

2) Anconeus

Question 3

What are the 2 main actions of the anterior compartment of the brachium?

Answer 3

Glenohumeral joint flexion and elbow joint flexion

Question 4

what are the 2 main actions of the posterior compartment of the brachium?

Answer 4

Glenohumeral joint extension and elbow joint extension

Question 5

what is the most superficial of the anterior muscles of the brachium?

Answer 5

biceps brachii

Question 6

what are the 2 origins of the biceps brachii?

Answer 6

1) Long head - supraglenoid tubercle

2) Short head - coracoid process

Question 7

what is the insertion of the biceps brachii?

Answer 7

radial tuberosity

Question 8

what are the 3 main actions of the biceps brachii?

Answer 8

Elbow flexion, glenohumeral flexion (synergist) and radio-ulnar supination

Question 9

which of the two heads of the biceps brachii is lateral?

Answer 9

long head is lateral

Question 10

what is the innervation of the biceps brachii?

Answer 10

musculocutaneous nerve

Question 11

biceps brachii crosses 3 joints, making it a _____ muscle

Answer 11

multi-articular

Question 12

what is the deepest muscle of the anterior compartment of the brachium

Answer 12

brachialis

Question 13

what are the origin and insertion of brachialis?

Answer 13

origin: anterior distal shaft of the humerus
insertion: ulnar tuberosity

Question 14

what is the main action of the brachialis?

Answer 14

elbow flexion

Question 15

what is the brachialis innervated by?

Answer 15

musculocutaneous nerve

Question 16

which part of the humerus does brachialis “Clothe”?

Answer 16

brachialis clothes the anterior inferior portion of the humerus

Question 17

which muscle is immediately deep to the short head of biceps brachii, superior to brachialis and lateral to pectorals minor?

Answer 17

Coracobrachialis

Question 18

what are the origin and insertion of coracobrachialis?

Answer 18

origin: coracoid process

Insertion: medial mid-shaft of humerus

Question 19

what are the 2 main actions of the coracobrachialis?

Answer 19

glenohumeral flexion and glenohumeral adduction

Question 20

what innervates the coracobrachialis muscle?

Answer 20

musculocutaneous nerve

Question 21

what is the name given to coracobrachialis?

Answer 21

monkey muscle

Question 22

what are the 3 origins of triceps brachii?

Answer 22

1) Long Head - infraglenoid tubercle
2) Lateral Head - Posterior surface of proximal Humerus
3) Medial Head - Posterior surface of distal humerus

Question 23

what is the insertion of triceps brachii?

Answer 23

olecranon fossa

Question 24

which of the heads of triceps brachii is most media?

Answer 24

the long head is most medial

Question 25

which head of triceps brachii is the most lateral?

Answer 25

the lateral head is the most lateral

Question 26

which head of triceps brachii is the most deep?

Answer 26

the medial head is the most deep

Question 27

what is the main action of triceps brachii?

Answer 27

elbow extensions

Question 28

what is triceps brachii innervated by?

Answer 28

radial nerve and the long head is also innervated by the axillary nerve

Question 29

what muscle is sometimes considered to be the 4th head of triceps brachii?

Answer 29

anconeus

Question 30

what are the origin and insertion of anconeus?

Answer 30

origin: lateral humeral epicondyle
insertion: olecranon process

Question 31

what is the main action of anconeus

Answer 31

elbow extension (synergist)

Question 32

what is anconeus innervated by?

Answer 32

radial nerve