Muscles If the Arm

Question 1

Biceps brachii

Answer 1

Origin: long head supraglenoid tubercle runs through the intertubercular groove through the shoulder joint

Short head: Corocoid process

Insertion: the two muscles join to form single muscle mass which attach to the radial tuberosity the other into the ante brachial facsia

Innervation musculocutaneous nerve

Function
Flex ion elbow, supinate arm

Question 2

Brachialis

Answer 2

Origin: lower half of the humerus just below deltoid insertion
Insert: Coronoid process and tubercle of ulna
Innervation: musculocutaneous radial
Function: flexion as does not insert into radius nil function in supination

Question 3

Corcobrachialis

Answer 3

Origin: Corocoid process
Insertion medial surface of the body of the humerus
Innervation: musculocutaneous
Function: flex and adduct arm

Question 4

Triceps brachii

Answer 4

Origin: long head infraglenoid tubercle of scapula
Medial head: posterior humerus distal to grove for radial nerve
Lateral head: proximal and lateral to the groove for radial nerve from greater tubercle
Insertion: olecranon process

Innervation: radial nerve
Function: extend forearm, fixate the elbow joint for fine movement

The long head of triceps is the most important factor in stabilizing the abducted shoulder joint to counteract gravity

Question 5

Aconeous

Answer 5

Origin: lateral epicondyle of he humerus
Insertion: proximal posterior ulna
Innervation: radial nerve
Function extension of elbow