biceps brachii
-Elbow flexion, Forearm supination
-C5, 6
-Upper trunk, lateral cord
-musculocutaneous nerve
Brachialis
-Elbow flexion
-C5,6
-Upper trunk, lateral cord
-Musculocutaneous nerve
Brachioradialis
-Elbow flexion
-C5,6
-Upper trunk, posterior cord
-Radial nerve (BELOW the spiral groove)
Pronator Teres
-Elbow flexion, Forearm pronation
-Common flexor tendon (medial epicondyle of humerus)
-C6, 7
-Upper and middle trunks, lateral cord
-Median nerve
Triceps
-Elbow extension
-C6, 7, 8
-All 3 trunks, posterior cord
-Radial nerve (innervated above the spiral groove)
Anconeous
-Elbow extension
-C6, 7, 8
-All 3 trunks, posterior cord
-Radial nerve (innervated ABOVE the spiral groove)
Supinator
- Forearm supination
- C5, 6
-Upper trunk, posterior cord, radial nerve, PIN
Pronator Quadratus
- Forearm pronation
- C7, 8, T1
- Middle and lower trunks, medial and lateral cords
- Median nerve-> AIN
Flexor Carpi Radialis (FCR)
- Common flexor tendon (medial epicondyle of humerus)
- C6, 7
- Upper and middle trunks, lateral cord
- Median Nerve
Flexor Carpi Ulnaris (FCU)
- Common flexor tendon (medial epicondyle of humerus)
- C8, T1
- Lower trunk, medial cord
- Ulnar nerve
Flexor Digitorum Superficialis (FDS)
- Common flexor tendon (medial epicondyle of humerus)
- C7, 8
- Middle and lower trunks, Medial and lateral cords
- Median nerve
Flexor Digitorum Profundus (FDP)
- Common flexor tendon (medial epicondyle of humerus)
- C7, 8, T1
- Middle and lower trunks, Medial cord
- Medial 1/2- Ulnar
- Lateral 1/2- AIN
anterior interosseous nerve (AIN) assessment
- Compression of the AIN nerve (also known as Kiloh-Nevin's syndrome) is a forearm compressive neuropathy that results in motor deficits of the AIN nerve without sensory changes
- weakness of grip and pinch, specifically thumb, index and middle finger fle
Froment's Test
Tests ulnar n. motor loss, patient asked to hold piece of paper between thumb/index finger, positive test results in weakness of adductor pollicis muscle allowing flexion at IP joint
Extensor carpi radialis Longus (ECRL)
- Common Extensor Tendon of Lateral Epicondyle of Humerus
- Radial Nerve
-2nd Wrist Compartment
extensor carpi radialis brevis (ECRB)
- Common Extensor Tendon of Lateral Epicondyle of Humerus
- PIN
- 2nd Wrist Compartment
Extensor Digitorum (ED)
- Common Extensor Tendon of Lateral Epicondyle of Humerus
- C7, 8
- Middle and lower trunk, Posterior cord
- Radial nerve-> PIN
- 4th Wrist Compartment
Extensor Carpi Ulnaris
- Common Extensor Tendon of Lateral Epicondyle of Humerus
- C7, 8
- Middle and lower trunk, posterior cord
- Radial nerve-> PIN
- 6th Wrist Compartment