Atlas (C1) vs Biceps brachii
| Property | Atlas (C1) | Biceps brachii |
|---|---|---|
| Latin Name | Atlas | Musculus biceps brachii |
| Type | Bone | Muscle |
| Body System | Skeletal | Muscular |
| Body Region | Spine | Upper Arm |
| Function | The first cervical vertebra that supports the skull. Allows nodding movements (flexion and extension) of the head at the atlanto-occipital joint. | Primary supinator of the forearm and powerful flexor of the elbow. Also assists in shoulder flexion. The long head assists in shoulder joint stabilization. |
| Clinical Significance | Jefferson fractures (burst fractures of the atlas) result from axial loading. Atlanto-occipital dislocation is usually fatal. Congenital anomalies include atlas assimilation (occipitalization). | Biceps tendon ruptures cause a visible bulge (Popeye deformity). Bicipital tendinitis causes anterior shoulder pain. The biceps reflex tests the C5-C6 nerve roots. |
| FMA ID | 12519 | 37670 |
Full structure pages
Atlas (C1)
Atlas
Ring-shaped and unusual in lacking both a vertebral body and a spinous process, the atlas is the first cervical vertebra and supports the skull. Its structure consists of anterior and posterior arches joined by two …
Biceps brachii
Musculus biceps brachii
A two-headed muscle of the anterior compartment of the upper arm, the biceps brachii is the primary supinator of the forearm and a powerful flexor of the elbow, also assisting in flexion of the shoulder. …