Medial border of forearm
Margo medialis antebrachii
- Latin synonym: Margo ulnaris antebrachii
- Synonym: Ulnar border of forearm
- Related terms: Ulnar border; Medial border
Definition
The medial border of the forearm is defined by the subcutaneous border of the ulna. This border extends from the medial epicondyle of the humerus proximally to the ulnar styloid process distally.
Associated Musculature
Muscles closely associated with this border include:
The flexor carpi ulnaris, in the anterior compartment.
The extensor carpi ulnaris, located more posteriorly.
Neurovascular Structures
The ulnar nerve is the primary neurovascular structure of the medial forearm. It courses behind the medial epicondyle at the elbow, then enters the forearm by passing between the two heads of the flexor carpi ulnaris muscle, continuing deep to this muscle along the medial forearm. The ulnar artery runs lateral to the ulnar nerve in the distal two-thirds of the forearm. Sensory innervation to the skin overlying the medial forearm is provided by the medial antebrachial cutaneous nerve.
References
Chaudhry MA, Hafeez AM, Sinkler MA, et al. Anatomy, Shoulder and Upper Limb, Forearm Compartments. [Updated 2023 Jul 31]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK539784/
