Anterior compartment of the arm
Encyclopedia
The anterior compartment of the arm is known as the "flexor compartment" as flexion
is its main action.
The muscles contained therein are the biceps brachii, brachialis, and coracobrachialis.
They are all supplied by the musculocutaneous nerve
, which arises from the fifth, sixth, and seventh cervical spinal nerves
(see Brachial plexus
).
Flexion
In anatomy, flexion is a position that is made possible by the joint angle decreasing. The skeletal and muscular systems work together to move the joint into a "flexed" position. For example the elbow is flexed when the hand is brought closer to the shoulder...
is its main action.
The muscles contained therein are the biceps brachii, brachialis, and coracobrachialis.
They are all supplied by the musculocutaneous nerve
Musculocutaneous nerve
The musculocutaneous nerve arises from the lateral cord of the brachial plexus, opposite the lower border of the Pectoralis major, its fibers being derived from C5, C6 and C7.-Path:...
, which arises from the fifth, sixth, and seventh cervical spinal nerves
Spinal nerve
The term spinal nerve generally refers to a mixed spinal nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body...
(see Brachial plexus
Brachial plexus
The brachial plexus is a network of nerve fibers, running from the spine, formed by the ventral rami of the lower four cervical and first thoracic nerve roots...
).
External links
- Overview at tufts.edu
- http://anatomy.med.umich.edu/musculoskeletal_system/axilla_ans.html