Upper subscapular nerve

Upper Subscapular Nerve

The Upper Subscapular Nerve is a nerve in the human body that is part of the brachial plexus, a network of nerve fibers that run from the spine, through the neck, axilla (armpit), and into the arm. The upper subscapular nerve specifically innervates the subscapularis muscle, which is located in the shoulder.

Etymology

The term "subscapular" comes from the Latin words "sub" meaning under, and "scapula" referring to the shoulder blade. Thus, "subscapular" refers to something located beneath the shoulder blade. The term "nerve" comes from the Latin "nervus", meaning sinew or string.

Anatomy

The upper subscapular nerve originates from the posterior cord of the brachial plexus, with roots from the C5 and C6 spinal nerves. It is a short nerve that runs to the subscapularis muscle, which it innervates. The subscapularis muscle is one of the four muscles that make up the rotator cuff, which is crucial for shoulder movement and stability.

Function

The primary function of the upper subscapular nerve is to provide motor innervation to the subscapularis muscle. This muscle plays a key role in the internal rotation of the humerus, the bone of the upper arm.

Clinical Significance

Damage to the upper subscapular nerve can result in weakness or paralysis of the subscapularis muscle, leading to difficulty in internal rotation of the arm. This can occur due to trauma, nerve compression, or diseases that affect the nerves, such as neuropathy.

Related Terms

• Brachial Plexus
• Subscapularis Muscle
• Rotator Cuff
• Neuropathy

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