Arm Muscles
Full Arm Anatomy ^
Arm Muscles
Deltoid ^
- Deltoid arches to the front, the sharp tip going backwards
- The Deltoid isn't round but has a bump in the middle
| MUSCLE PART | ORIGIN | INSERTION |
|---|---|---|
| Deltoid Anterior Head | ||
| Deltoid Medial Head | ||
| Deltoid Posterior Head |
Example
Biceps Brachii ^
The Biceps consists of two heads that unite at the bottom
| MUSCLE PART | ORIGIN | INSERTION | INFO |
|---|---|---|---|
| Biceps Short Head (BB) | Scapula coracoid process | Radius tuberosity | More towards the center |
| Biceps Long Head (BB) | Socket of the Scapula | Radius tuberosity |
Brachialis ^
| MUSCLE PART | ORIGIN | INSERTION | INFO |
|---|---|---|---|
| Brachialis |
Triceps Brachii ^
The Triceps consists of three heads that unite at the bottom into the Triceps tendon
| MUSCLE PART | ORIGIN | INSERTION | INFO |
|---|---|---|---|
| Triceps Long Head (T) | Scapula | Olecranon (Elbow) | |
| Triceps Lateral Head (T) | Humerus | Olecranon (Elbow) | |
| Triceps Medial Head (T) | Humerus | Olecranon (Elbow) | |
| Triceps Tendon (T) | Middle of Long/Lateral Tricpes head | Olecranon (Elbow) |
Coracobrachialis ^
| MUSCLE PART | ORIGIN | INSERTION | INFO |
|---|---|---|---|
| Coracobrachialis |
Example
The forarm muscles are split into two groups the Flexors and Extensor. These two groups are visibly distinct, the Extensor group being the bigger one. The front border is below the Biceps/ Brachialis and the back border is below the Triceps, following the Ulna. The Extensors are farther from the midline where as the Flexors are closer to the midline.
Flexor and Extensor borders
Forearm Flexors ^
| MUSCLE | ORIGIN | INSERTION | INFO |
|---|---|---|---|
| Flexor Carpi Ulnaris (FCU) | Between Triceps and Biceps | Bottom of hand far side from thumb | |
| Flexor Digitorum Superficialis (FDS) | Phalangas, bottom side of all fingers except thumb | Barely visible | |
| Palmaris Longus (PL) | Between Triceps and Biceps | Hand Plam | Barely visible |
| Flexor Carpi Radialis (FCR) | Between Triceps and Biceps | Bottom of hand close side to thumb | |
| - | - | - | - |
| Pronator Teres (PT) | Between Triceps and Biceps | Middle of Brachioradialis | Stays beside the Biceps |
Forearm Extensors ^
| MUSCLE | ORIGIN | INSERTION | INFO |
|---|---|---|---|
| Brachioradialis (Brr) | Between Brachialis and Triceps | Inner side of hand | Brachialis side, bigger one |
| Extensor Carpi Radialis Longus (ECRL) | Between Brachialis and Triceps | Inner side of hand | Triceps side, smaller one |
| - | - | - | - |
| Extensor Carpi Radialis Brevis (ECRB) | Between Extensor Carpi Radialis Longus and Triceps | Inner side of hand | Barely visible, Smaller one |
| Abductor Pollicis Longus & Extensor Pollicis Brevis (Anatomical Snuffbox) | Middle of Extensor Digitorum | Inner sie of hand | Barely visible |
| - | - | - | - |
| Extensor Digitorum (ED) | Between Extensor Carpi Radialis Longus and Triceps | Top of hand | Bigger one, goes to the top tips of all fingers except thumb |
| - | - | - | - |
| Extensor Digitorum Minimi (EDM) & Extensor Carpi Ulnaris (ECU) | Between Extensor Carpi Radialis Longus and Triceps | Top of hand far side from thumb | Should be done as one |
| - | - | - | - |
| Anconeus (A) | Below Triceps |