Which of the following muscles is NOT a flexor of the elbow?

A) Biceps brachii
B) Brachioradialis
C) Brachialis
D) Triceps brachii
E) All of these are flexors of the elbow.

Triceps Brachii

A large muscle on the back of the upper arm responsible for the extension of the elbow joint, consisting of three heads (long, lateral, and medial).

Biceps Brachii

A large muscle on the front side of the upper arm, responsible for elbow flexion and forearm rotation.

Brachialis

A muscle in the upper arm that flexes the elbow, situated beneath the biceps muscle.