Muscles Of The Posterior Compartment Of The Arm

Question 1

Triceps brachii origin

Answer 1

Long head-infraglenoid tubercle (superior aspect of the lateral border of the scapula)
Medial head- posterior humerus inferior to the radial groove
Lateral head- posterior humerus superior to radial groove

Question 2

Triceps brachii insertion

Answer 2

common insertion onto Proximal olecranon of the ulna and antebrachial fascia

Question 3

Triceps brachii nerve

Answer 3

radial nerve

Question 4

Triceps brachii blood supply

Answer 4

Brachial artery

Question 5

Triceps brachii action

Answer 5

Chief Extensor of forearm at elbow

Helps with extension at shoulder at shoulder joint.

Question 6

Anconeus origin

Answer 6

Lateral Epicondyle of the humerus

Question 7

Anconeus insertion

Answer 7

Lateral ulna at the olecranon process

Question 8

Anconeus nerve

Answer 8

Radial

Question 9

Anconeus action

Answer 9

Extension of elbow (assists triceps)

Stabilizes elbow joint

Question 10

Brachioradialis(forearm muscle) origin

Answer 10

Lateral Supracondylar ridge

Question 11

Brachioradialis(forearm muscle) insertion

Answer 11

Lateral distal radius

Question 12

Brachioradialis(forearm muscle) nerve

Answer 12

radial

Question 13

Brachioradialis(forearm muscle) action

Answer 13

flexes the elbow
can initiate pronation and supination if forearm is in opposite position
keeps forearm in a neutral position