Muscles of the Arm Flashcards
How many muscles are in the arm?
3 anteriorly
1 posteriorly
Which 3 muscles are in the anterior compartment?
Biceps brachii
Brachialis
Coracobrachialis
Which nerve innervates the muscles of the anterior forearm?
Musculocutaneous
What is special about the Biceps brachii?
It has 2 heads, the long head and short head
Where does the long head of the Biceps brachii attach?
Supraglenoid tubercle of the Scapula
Where does the short head of the Biceps brachii attach?
Corocoid process of the Scapula
Where does the tendon of the Biceps brachii attach?
To the radial tuberosity
What is the action of the Biceps brachii?
Supination of the forearm
Flexion at the elbow
Flexion at the shoulder
Which spinal cord segment can be tested by tapping on the Biceps Brachii tendon at the radial tuberosity?
C6
Which tendon of the Biceps brachii is most likely to rupture?
The long head tendon
What is the sign for a Biceps brachii tendon rupture?
Popeye sign on flexing the elbow
Where is the coracobrachialis in relation to the Biceps brachii?
Deep
What is the main action of the Coracobrachialis?
Flexion at the shoulder
What are the attachment points for the Coracobrachilalis?
Coracoid process of the Scapula
Medial side of shaft of the humerus
Where is the Brachialis in relation to the Biceps brachii?
Deep
What is the main action of the Brachialis?
Main flexor at the elbow
What are the attachment points of the Brachialis?
Medial and lateral surface of the humerus
Tuberosity of the Ulna
What is the only muscle in the posterior compartment of the arm?
The Triceps brachii
What is special about the Triceps brachii muscle?
It has 3 heads; Long, lateral and medial
What is the main action of the Triceps brachii?
Extension at the elbow
What innervates the Triceps brachii?
The radial nerve
Which spinal cord segment can be tested by tapping on the Triceps brachii tendon?
C7
