Pronator Teres
Attachments Action, Innervation
- Humeral Head: Superior Medial Epicondyle
- Ulnar Head: Coronoid Process
- Middle part, Lateral Surface Radius
Action: Pronation + Weak Flexion Forearm
Nerve Supply: Median Nerve (C6,C7)
Flexor Carpi Radialis
Attachments, Action, Innervation
- Medial Epicondyle of Humerus
- Base of 2nd Metacarpal
Action: Flex + Abduct Hand at Wrist
Nerve Supply: Median Nerve (C6, C7)
Palmaris Longus
Attachments, Action, Innervation
- Medial Epicondyle of Humerus
- Flexor Retinaculum + Palmar Aponeurosis
Action: Flexes Hand at Wrist (Weakly) + Tenses Palmar Aponeurosis
Nerve Supply: Median Nerve (C7 and C8)
Flexor Carpi Ulnaris
Attachments, Action, Innervation
- Humeral Head: Medial Epicondyle
- Ulnar Head: Olecranon + Posterior Border Ulna
- Pisiform + Hamate + 5th Metacarpal
Action: Flex + Adduct Hand at Wrist
Nerve Supply: Ulnar Nerve (C7 and C8)
Flexor Digitorum Superficialis
Attachments, Action, Innervation
- Humeroulnar Head: Medial Epicondyle of Humerus + Coronoid Process
- Radial Head: Superior 1/2 Anterior Border Radius
- Shafts middle Phalanges 2-5
Action: Flexes Middle and Proximal Phalanges 2-5
Nerve Supply: Median Nerve (C7,C8 and T1)
Flexor Digitorum Profundus
Attachments, Action, Innervation
- Proximal 3/4 Anterior, Medial Aspect Ulna + Interosseous Membrane
- Bases of Distal Phalanges of Digits 2-5
Action: Flex Distal Phalanges 2-5
Nerve Supply:
Medial 1/2: Ulnar Nerve (C8,T1)
Lateral 1/2: Median Nerve (C8,T1)
Flexor Pollicis Longus
Attachments, Action, Innervation
- Anterior Surface Radius + Interosseous Membrane
- Base 1st Distal Phalanx
Action: Flex Phalanges of Digit 1
Nerve Supply: Median Nerve (C8, T1)
Pronator Quadratus
Attachments, Action, Innervation
- Distal 1/4 Anterior Surface Ulna
- Distal 1/4 Anterior Surface Radius
Action: Pronation of Forearm
Nerve Supply: Median Nerve (C8,T1)
Brachioradialis
Attachments, Action, Innervation
- Proximal 2/3 Lateral Supracondylar Ridge
- Lateral, Distal Radius, Proximal to Styloid Process
Action: Flexion of Forearm at Elbow + Stabilize elbow
Nerve Supply: Radial Nerve (C5, C6, C7)
Extensor Carpi Radialis Longus
Attachments, Action, Innervation
- Lateral Supracondylar Ridge
- Base of 2nd Metacarpal
Action: Extension + Abduction Hand at Wrist
Nerve Supply: Radial Nerve (C6, C7)
Extensor Carpi Radialis Brevis
Attachments, Action, Innervation
- Lateral Epicondyle
- Base 3rd Metacarpal
Action: Extension + Abduction Hand at Wrist
Nerve Supply: Deep Branch Radial Nerve (C7,C8)
Extensor Digitorum
Attachments, Action, Innervation
- Lateral Epicondyle of Humerus
- Extensor Expansion of Digits 2-5
Action: Extension of Digits 2-5
Nerve Supply: Deep Branch Radial Nerve (C7,C8)
Extensor Digiti Minimi
Attachments, Action, Innervation
- Lateral Epicondyle of Humerus
- Extensor Expansion of Digit 5
Action: Extends Digit 5
Nerve Supply: Deep Branch Radial Nerve (C7, C8)
Extensor Carpi Ulnaris
Attachments, Action, Innervation
- Lateral Epicondyle of Humerus + Posterior Border of Ulna
- Base of 5th Metacarpal
Action: Extend + Adduct Hand at Wrist
Nerve Supply: Deep Branch of Radial Nerve (C7,C8)
Anconeus
Attachments, Action, Innervation
- Lateral Epicondyle of Humerus
- Lateral Surface Olecranon + Superior & Posterior Surface of Ulna
Action: Assist Extension of Forearm at Elbow
Nerve Supply: Radial Nerve (C7,C8,T1)
Supinator
Attachments, Action, Innervation
- Lateral Epicondyle of Humerus, Radial Collateral Lig., Annular Lig., Supinator Fossa, Crest of Ulna
- Lateral, Anterior & Posterior Surfaces of Proximal 3rd Radius
Action: Supination of Forearm
Nerve Supply: Deep Branch of Radial Nerve (C7,C8)
Abductor Pollicis Longus
Attachments, Action, Innervation
- Posterior Surfaces of Radius, Ulna & Interosseous Membrane
- Base of 1st Metacarpal
Action: Abduct + Extend 1st Digit at Carpometacarpal Joint
Nerve Supply: Posterior Interosseous Nerve (C7,C8)
Extensor Pollicis Brevis
Attachments, Action, Innervation
- Posterior Surface of Radius + Interosseous Membrane
- Base of 1st Proximal Phalanx
Action: Extension of 1st Proximal Phalanx
Nerve Supply: Posterior Interosseous Nerve (C7,C8)
Extensor Pollicis Longus
Attachments, Action, Innervation
- Posterior Surface of Ulnar & Interosseous Membrane
- Base of 1st Distal Phalanx
Action: Extend Distal Phalanx 1st Digit + Extends 1st Proximal Phalanx & 1st Metacarpal
Nerve Supply: Posterior Interosseous Nerve (C7,C8)
Extensor Indicis
Attachments, Action, Innervation
- Posterior Surface of Ulna + Interosseous Membrane
- Extensor Expansion of 2nd Digit
Action: Extend 2nd Digit + Assist extension of Hand at Wrist
Nerve Supply: Posterior Interosseous Nerve (C7 and C8)
