Musculus pronator teres
The pronator teres is a vestigial muscle in horses. It originates from the medial epicondyle of the humerus and inserts on the medial border of the radius. In species that can rotate the forearm it pronates the limb. In the horse the radius and ulna are fused, so pronation and supination are impossible and the muscle has minimal functional significance. It is innervated by the median nerve (roughly C8-T1).
Origin: Medial epicondyle of the humerus
Insertion: Medial border of the radius
Action: Vestigial; minimal functional significance in horses (cannot pronate the fused radius/ulna)
Innervation: Median nerve (C8-T1)
No clinical significance as a functional muscle. Relevant only as an anatomical remnant.
## Overview Medial epicondylar pain is discomfort at the bony prominence on the inside of the elbow where several muscles originate. It is usually part of a broader elbow problem rather than an isola
Not a structure of practical concern for owners.
## Overview Medial epicondylar pain is discomfort at the bony prominence on the inside of the elbow where several muscles originate. It is usually part of a broader elbow problem rather than an isolated condition. Lameness and pain on palpation of the medial epicondyle are the main findings. ## Causes Strain at the muscle origin or associated joint pathology. ## Diagnosis Palpation and imaging of the elbow region. ## Treatment Rest and anti-inflammatories. Treat any concurrent elbow joint disease. ## Recovery and Prognosis Generally good. ## Prevention Avoidance of repetitive overload. Signs include: deep medial elbow pain; pain on palpation of the medial epicondyle; usually part of broader elbow pathology
No clinical significance as a functional muscle. Relevant only as an anatomical remnant.
Not a structure of practical concern for owners.
See the Pronator Teres on our interactive 3D horse model. Open 3D Model