Posterior muscles of the upper arm

Question 1

What is the only posterior muscle of the upper arm?

Answer 1

Triceps brachii

Question 2

How many heads does triceps brachii have?

Answer 2

3 heads

Long head, medial head, lateral head

Question 3

Which nerve innervates triceps brachii?

Answer 3

Radial nerve

Question 4

Where is the long head of triceps brachii, and what is the origin site?

Answer 4

1

Originates from infraglenoid tubercule of scapula

Question 5

Where is the medial head of triceps brachii, and what is the origin site?

Answer 5

3

Originates from humeral shaft, inferior to radial groove

Question 6

Where is the lateral head of triceps brachii, and what is the origin site?

Answer 6

2

Originates from humeral shaft, superior to radial groove

Question 7

What is the function of triceps brachii?

Answer 7

Elbow extension

Question 8

Where is the attachment site of the triceps brachii tendon?

Answer 8

Heads converge distally tendon which attaches to olecranon process of ulna