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Extensor Carpi Radialis Brevis Muscle

image descriptionExtensor Carpi Radialis Brevis Muscle

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

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

Insertion (distal attachment)
a. Base of 3rd metacarpal (dorsal surface).

A posterior 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, Extensor Digitorum, Extensor Carpi Radialis Brevis (highlighted in green), Flexor Carpi Ulnaris, Extensor Digiti Minimi, Extensor Carpi Ulnaris and Extensor Retinaculum.
A posterior view of the forearm showing the bony elements and isolated Extensor Carpi Radialis Brevis muscle.
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Actions of the Extensor Carpi Radialis Brevis Muscle:

a.  image descriptionExtends the hand at the wrist.

b. image descriptionRadial deviates (abducts) the hand at the wrist.

Nerve to the Extensor Carpi Radialis Brevis muscle and its spinal segment:

a. Radial nerve (C6, C7).

An overview of the posterior 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 1-10 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 1-10. 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 10. Extensor Retinaculum.
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. 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 9. Extensor Retinaculum.
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. 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 8. Extensor Retinaculum.
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. Anconeus 2. Extensor Digitorum 3. Extensor Carpi Radialis Brevis 4. Flexor Carpi Ulnaris 5. Extensor Digiti Minimi 6. Extensor Carpi Ulnaris 7. Extensor Retinaculum.
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. Extensor Digitorum 2. Extensor Carpi Radialis Brevis 3. Flexor Carpi Ulnaris 4. Extensor Digiti Minimi 5. Extensor Carpi Ulnaris 6. Extensor Retinaculum.
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. Extensor Carpi Radialis Brevis 2. Flexor Carpi Ulnaris 3. Extensor Digiti Minimi 4. Extensor Carpi Ulnaris 5. Extensor Retinaculum.
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. Extensor Carpi Radialis Brevis 2. Flexor Carpi Ulnaris 3. Extensor Carpi Ulnaris 4. Extensor Retinaculum.
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. Extensor Carpi Radialis Brevis 2. Flexor Carpi Ulnaris 3. Extensor Retinaculum.
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. Supinator 2. Extensor Carpi Radialis Brevis 3. Abductor Pollicis Longus 4. Extensor Pollicis Longus 5. Extensor Pollicis Brevis 6. Extensor Indicis 7. Extensor Retinaculum.
A test yourself image of the dorsal view of the forearm showing the bony elements and the isolated Extensor Carpi Radialis Brevis muscle numbered 1.
A test yourself image of the dorsal view of the forearm showing the bony elements and the attachments of the Extensor Carpi Radialis Brevis muscle. The origin at the lateral epicondyle of humerus is marked by a red circle and the insertion at the base of 3rd metacarpal (dorsal surface) is marked by a blue oval.
Test yourself while observing the Extensor Carpi Radialis Brevis muscle
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