Pronator Teres
Forearm · Upper Limb
Pronator Teres belongs to the Forearm group of the Upper Limb. Originating at Humeral head: medial epicondyle (common flexor origin); Ulnar head: coronoid process, it inserts at Middle of lateral surface of radius. It is responsible for several movements: Pronation of forearm; assists flexion of elbow. Its nerve supply is the Median nerve (C6, C7).
Origin, Insertion, Action & Nerve
Origin
Humeral head: medial epicondyle (common flexor origin); Ulnar head: coronoid process
Insertion
Middle of lateral surface of radius
Action
Pronation of forearm; assists flexion of elbow
Nerve
Median nerve (C6, C7)
Attachments explained
The Pronator Teres is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.
Origin
Humeral head: medial epicondyle (common flexor origin); Ulnar head: coronoid process
Insertion
Middle of lateral surface of radius
Action & function
When the Pronator Teres contracts, it produces the following movements: Pronation of forearm; assists flexion of elbow.
As part of the Forearm group of the Upper Limb, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.
Nerve supply & clinical relevance
The Pronator Teres receives its nerve supply from the Median nerve (C6, C7). This nerve carries fibres from spinal segment(s) C6, C7.
Because a muscle can only contract when its nerve is intact, injury to the Median nerve or to its spinal roots (C6, C7) can weaken or paralyse the Pronator Teres, impairing the movements it normally produces (pronation of forearm). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Pronator Teres (the OIANS method)
OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Pronator Teres, work through them in order: picture its origin, trace the muscle to its insertion, reason out the action that shortening between those two points must create, then add the nerve that drives it.
Most students remember the Pronator Teres fastest by linking its action back to its attachments rather than memorising each fact in isolation. Once the origin and insertion make sense, the action usually follows logically.
Pronator Teres quick facts
- Region
- Upper Limb
- Group
- Forearm
- Origin
- Humeral head: medial epicondyle (common flexor origin); Ulnar head: coronoid process
- Insertion
- Middle of lateral surface of radius
- Action
- Pronation of forearm; assists flexion of elbow
- Nerve
- Median nerve (C6, C7)
- Spinal roots
- C6, C7
Frequently asked questions
Where is the Pronator Teres located?
The Pronator Teres is a muscle of the Forearm group, located in the Upper Limb.
What is the origin of the Pronator Teres?
Humeral head: medial epicondyle (common flexor origin); Ulnar head: coronoid process
What is the insertion of the Pronator Teres?
Middle of lateral surface of radius
What movements does the Pronator Teres produce?
Pronation of forearm; assists flexion of elbow
What nerve supplies the Pronator Teres?
Median nerve (C6, C7)
Is the Pronator Teres free to study in OIANS?
Yes. The Pronator Teres is free in OIANS: its full origin, insertion, action and nerve details are open to everyone in the Muscle Directory, and because it belongs to the Upper Limb it is also covered by the free Quiz and Flashcard decks. The other regions, the "All Muscles" deck, and the Progress and Explore tools are unlocked with a one-time Lifetime purchase.
Related muscles
Study the Pronator Teres
Test yourself on Upper Limb muscles with interactive quizzes and flashcards in the free OIANS app.
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