Q36 Triceps Brachii

Question 1

state the position of this muscle

Answer 1

Posterior aspect of the upper arm and makes up all the muscle bulk in this region

Question 2

Give the attachments of this muscle

Answer 2

Proximal: (three heads) Long head infraglenoid tubercle and glenoid labrum of the scapula. Lateral head- posterior surface of the shaft of the humerusabove the spiral groove. Medial head- posterior surface of humerus below and medial to the spiral groove.Three heads converge to a tendon. Distal: tendon attaches to the proximal surface of the olecranon of the ulna and deep fascia of forearm.

Question 3

List the actions of this muscle

Answer 3

Extends elbow joint, long head extends arm at shoulder joint, assists in adduction of humerus.

Question 4

Name two functional activities in which this muscle has a prime action

Answer 4

Triceps extends the elevated arm to put books on a shelf. Works strong in punching. Pushing up from a chair, pushing a car etc