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Biceps Brachii – Attachments, Action & Innervation

image descriptionBiceps Brachii (Musculus biceps brachii):

Biceps brachii is one of the main muscles of the upper arm which acts on both the shoulder joint and the elbow joint. It derives its name from the fact that it consists of two parts (heads).

An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii and Triceps brachii muscles
An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii and Triceps brachii muscles
An image showing the biceps brachii muscle alone.
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image descriptionAttachments of Biceps Brachii: Origin & Insertion

Origin: (proximal attachments)
a. Long head: supraglenoid tubercle of the scapula.
b. Short head: coracoid process of the scapula.

Insertion: (distal attachments)
a. Radial tuberosity.
b. Bicipital aponeurosis to the fascia on the medial side of the forearm.

An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii and Triceps brachii muscles
An image showing the biceps brachii muscle alone.
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Actions of Biceps Brachii:

Both heads:

image descriptiona. Flex the arm (weakly) at the shoulder.
* (Both heads also flex & supinate the forearm at the elbow).

image descriptionb. Flexes forearm at elbow.

image descriptionc. Supinates forearm at elbow.

Innervation of Biceps Brachii:

a. Musculocutaneous nerve.
b. C5, C6, and C7.
the Muculocutaneous nerve innervating the biceps muscle
Musculocutaneous nerve within the brachial plexus
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An overview of the anterior muscles of the arm:

An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii, Triceps brachii, latissimus dorsi, brachioradialis and pronator teres muscles
An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii, Triceps brachii, latissimus dorsi, brachioradialis and pronator teres muscles
An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii, Triceps brachii, latissimus dorsi, brachioradialis and pronator teres muscles
An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii, Triceps brachii, latissimus dorsi and brachialis muscles
An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii, Triceps brachii, latissimus dorsi and brachialis muscles
An anterior view of the arm muscles with labels for Deltoid, Pectoralis major, Biceps brachii, Triceps brachii and brachizalis muscles
An anterior view of the arm muscles with labels for Coracobrachialis, Subscapularis, Biceps brachii, Triceps brachii, Teres minor and brachialis muscles
An anterior view of the arm muscles with labels for Coracobrachialis, Subscapularis, Biceps brachii and Teres minor muscles
Insertion and origin of the biceps brachii muscle
Test yourself while observing the Biceps Brachii muscle
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