Biceps Brachialis

(Biceps)

<Upper Limb>   <Anatomy>

<Index>

 

 

 

Definition

-  Muslce of upper limb

 

Clinical Relevance

-  Rupture of tendon

-  Yergasons test

 

Features

-  L. two heads of the arm

-  Divided into two heads:

-  Short head

-  Long head

-  Long & short heads fuse distal to midpoint of forearm

-  Tendon of long head travels within intertubercular groove of humerus deep to transverse humeral ligament & within glenohumeral joint space

-  Transverse humeral ligament retains the long head of biceps, rupture of this ligmanet may occur

-  Common tendinous attachment onto radial tuberosity is separated from anterior portion of tuberosity via the bicipitoradial bursa

-  Distal tendon rotates so that anterior surface faces laterally as it inserts onto radius

-  Bicipital Aponeurosis (Lacertus Fibrosis)

-  Triangular membranous band

-  Attaches to the tendon of biceps brachii laterally & deep fascia overlying flexor compartment muscles of forearm medially

-  Serves as a protective structure for the underlying brachial artery & median nerve

-  Helps disperse mechanical force of biceps brachii

 

Origin

-  Short Head: tip of coracoid process of scapula, lateral to tendon of pectoralis minor & coracobrachialis

-  Long Head: supraglenoid tubercule of glenoid fossa of scapula, enclosed within synovial sheath of glenohumeral joint, through intertubercular groove of humerus

 

Insertion

-  Posterior portion of radial tuberosity of radius, forearm fascia via bicipital aponeurosis

 

Action

-  Supination of forearm

-  Flexion of elbow in supination

-  Long Head: stabilies & depresses humeral head

 

Innervation

-  Musculocutaneous nerve (C5, C6)

 

Blood Supply

-   

 

 

 

References

 

Moores Clinically Oriented Anatomy