Arm Muscles

Question 1

Function of medial & lateral intermuscular septal?

Answer 1

deep fasia that divides the arm into anterior and posterior compartments

Question 2

What muscles are in the anterior/flexor compartment?

Answer 2

1. biceps brachii
2. coracobrachialis
3. brachialis

Question 3

What are the muscles in the posterior compartment?

Answer 3

1. Triceps brachii

Question 4

What nerve innervates the anterior and posterior compartments?

Answer 4

Anterior = musculocutaneous n

posterior = radial n

Question 5

O, I & function of biceps brachii?

Answer 5

O:
long head: supraglenoid tubercle
short head: coracoid process

I: Radial tuberosity & fascia

Function:
1. Flex forearm (both)
2. Supination (both)
3. Flex shoulder (long)

**long head only crosses shoulder joint

Question 6

O, I & function of coracobrachialis?

Answer 6

O: coracoid process
I: humurus (middle 3rd medial)

Function:
1. Flex arm @ shoulder joint
2. Adduction @ shoulder joint (esp horizontal)

Question 7

O, I & function of brachialis?

Answer 7

O: anterior distal humerus
I: Ulnar tuberosity & coronoid process (ulna)

F: Flex forearm @ elbow

Question 8

O, I & function of triceps brachii?

Answer 8

O:
long: infraglenoid tubercle
lateral: post. lat. humerus (superior to radial groove)
medial: posterior humerus (inferior to radial groove

I: olecranon process (ulna)

Function:
1. Extend forearm
2. Extension of arm (long head)

Question 9

What muscle does elbow flexion with supination?

Answer 9

biceps

Question 10

What muscle does elbow flexion with pronation?

Answer 10

brachialis

Question 11

What muscle does flexion with mid pronation

Answer 11

brachioradialis