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Anconeus Muscle – Attachments, Action & Innervation

image descriptionAnconeus Muscle

Anconeus muscle is a small muscle that is triangular in shape. It’s sometimes blended with triceps brachii or extensor carpi ulnaris.

A dorsal view of the forearm showing the bony elements and the deeper muscles. The visible, labelled muscles are as follows: Triceps Brachii, Brachioradialis, Extensor Carpi Radialis Longus, Anconeus (highlighted in green), Extensor Digitorum, Extensor Carpi Radialis Brevis, Flexor Carpi Ulnaris, Extensor Digiti Minimi, Extensor Carpi Ulnaris.
A dorsal view of the forearm showing the bony elements and the deeper muscles. The visible, labelled muscles are as follows: Anconeus (highlighted in green), Extensor Digitorum, Extensor Carpi Radialis Brevis, Flexor Carpi Ulnaris, Extensor Digiti Minimi, Extensor Carpi Ulnaris.
A dorsal view of the forearm showing the bony elements and the deeper muscles. The visible, labelled muscles are as follows: Anconeus (highlighted in green), Supinator, Abductor Pollicis Longus, Extensor Pollicis Longus, Extensor Pollicis Brevis, Extensor Indicis.
A dorsal view of the forearm showing the bony elements and isolated Anconeus muscle.
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image descriptionAttachments of Anconeus Muscle: Origin and Insertion

Origin (proximal attachment)
a. Lateral epicondyle of humerus.

Insertion (distal attachment)
a. Posterior olecranon process of ulna.

A dorsal view of the forearm showing the bony elements and the deeper muscles. The visible, labelled muscles are as follows: Triceps Brachii, Brachioradialis, Extensor Carpi Radialis Longus, Anconeus (highlighted in green), Extensor Digitorum, Extensor Carpi Radialis Brevis, Flexor Carpi Ulnaris, Extensor Digiti Minimi, Extensor Carpi Ulnaris.
A dorsal view of the forearm showing the bony elements and isolated Anconeus muscle.
A dorsal view of the forearm showing the bony elements and the attachments of the Anconeus muscle. The origin at the lateral epicondyle of humerus is marked by a red circle and the insertion at the posterior olecranon process of the ulna is marked by a blue oval.
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Actions of Anconeus on the arm (humerus):

a.  image descriptionExtends the forearm at the elbow.

Image 1 of the animation for extension of the forearm at the elbow.
Image 2 of the animation for extension of the forearm at the elbow.
Image 3 of the animation for extension of the forearm at the elbow.
Image 4 of the animation for extension of the forearm at the elbow.
Image 5 of the animation for extension of the forearm at the elbow.

Nerve to Anconeus muscle and its spinal segment:

Radial nerve (C7, C8).

An Overview of the Forearm Muscles

A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-9 and the answers in the box below are concealed.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-9. The answers in the box below are as follows 1. Triceps Brachii 2. Brachioradialis 3. Extensor Carpi Radialis Longus 4. Anconeus 5. Extensor Digitorum 6. Extensor Carpi Radialis Brevis 7. Flexor Carpi Ulnaris 8. Extensor Digiti Minimi 9. Extensor Carpi Ulnaris.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-8. The answers in the box below are as follows 1. Brachioradialis 2. Extensor Carpi Radialis Longus 3. Anconeus 4. Extensor Digitorum 5. Extensor Carpi Radialis Brevis 6. Flexor Carpi Ulnaris 7. Extensor Digiti Minimi 8. Extensor Carpi Ulnaris.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-7. The answers in the box below are as follows 1. Extensor Carpi Radialis Longus 2. Anconeus 3. Extensor Digitorum 4. Extensor Carpi Radialis Brevis 5. Flexor Carpi Ulnaris 6. Extensor Digiti Minimi 7. Extensor Carpi Ulnaris.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-6. The answers in the box below are as follows 1. Anconeus 2. Extensor Digitorum 3. Extensor Carpi Radialis Brevis 4. Flexor Carpi Ulnaris 5. Extensor Digiti Minimi 6. Extensor Carpi Ulnaris.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-5. The answers in the box below are as follows 1. Anconeus 2. Extensor Digitorum 3. Flexor Carpi Ulnaris 4. Extensor Digiti Minimi 5. Extensor Carpi Ulnaris.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-4. The answers in the box below are as follows 1. Anconeus 2. Flexor Carpi Ulnaris 3. Extensor Digiti Minimi 4. Extensor Carpi Ulnaris.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-3. The answers in the box below are as follows 1. Anconeus 2. Flexor Carpi Ulnaris 3. Extensor Carpi Ulnaris.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-2. The answers in the box below are as follows 1. Anconeus 2. Flexor Carpi Ulnaris.
A test yourself image of the dorsal view of the forearm showing the bony elements and the deeper muscles. The visible muscles of the forearm are numbered 1-6. The answers in the box below are as follows 1. Anconeus 2. Supinator 3. Abductor Pollicis Longus 4. Extensor Pollicis Longus 5. Extensor Pollicis Brevis 6. Extensor Indicis.
A test yourself image of the dorsal view of the forearm showing the bony elements and the isolated Anconeus muscle numbered 1.
A test yourself image of the dorsal view of the forearm showing the bony elements and the attachments of the Anconeus muscle.
Test yourself while observing the Anconeus muscle
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