Biceps brachii

Description

Commonly known as the biceps, is a two-headed muscle that lies on the upper arm between the shoulder and the elbow.[1]

Origin

Origin of Short Head: Apex of the coracoid process of

 the scapula.

Origin of Long Head: Supraglenoid tubercle of the scapula.[2]

Insertion

Tuberosity of the radius and aponeurosis of the biceps brachii (lacertus fibrosus).[2]

Nerve

Musculocutaneous C5, 6.[2]

Artery

Muscular branches of brachial artery[3]

Function

Flexes the shoulder joint. The short head assists with shoulder adduction. The long head may assist with abduction if the humerus is laterally rotated. With the origin fixed, flexes the elbow joint, moving the forearm toward the humerus and supinates the forearm. With the insertion fixed, flexes the elbow joint, moving the humerus toward the forearm, as in pull-up or chinning
exercises.[2]

Video

Assessment

Muscle test

Patient: Supine or sitting.
Fixation: The examiner places one hand under the elbow to cushion it from table pressure.
Test: Elbow flexion slightly less than or at a right angle, with the forearm in supination.
Pressure: Against the lower forearm, in the direction of extension.[2]


palpation

[4]

length test

[5]

pathology

Weakness


Decreases the ability to flex the forearm
against gravity. Interferes markedly with daily activities such as feeding oneself or combing the hair.[2]

shortness


Flexion deformity of the elbow if combined with brachialis muscle shortness.[2]


Treatment

strenghening
[6]

stretching

[7]

Resources

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Biceps-brachii.jpgDownload.jpgBicep1.jpg

See also

Rupture Long Head Biceps

Biceps Load II Test

Biceps Tendonitis

Yergasons Test

References

  1. Florence P.muscles testing and function with posture and pain.1993
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Florence P.muscles testing and function with posture and pain.1993
  3. https://rad.washington.edu/muscle-atlas/biceps-brachii/
  4. https://www.youtube.com/watch?v=EIeTYmD4aes
  5. https://www.youtube.com/watch?v=SSepwDda21Y
  6. https://www.youtube.com/watch?v=Id8FkHucAN0
  7. https://www.youtube.com/watch?v=TuS_ZnOkg3k