Subscapular nerves: Difference between revisions

Latest revision as of 10:47, 15 February 2025

Anatomy and function of the subscapular nerves

Subscapular nerves[edit]

The subscapular nerves are a group of nerves that arise from the brachial plexus and innervate the subscapularis muscle and the teres major muscle. These nerves are crucial for the movement and stabilization of the shoulder joint.

File:Gray807.png

Diagram of the brachial plexus, showing the subscapular nerves.

Anatomy[edit]

The subscapular nerves originate from the posterior cord of the brachial plexus, which is formed by the union of the posterior divisions of the upper, middle, and lower trunks. Specifically, the subscapular nerves are derived from the C5 and C6 nerve roots.

There are typically two subscapular nerves:

The upper subscapular nerve (also known as the superior subscapular nerve) innervates the upper part of the subscapularis muscle.
The lower subscapular nerve (also known as the inferior subscapular nerve) innervates the lower part of the subscapularis muscle and the teres major muscle.

Function[edit]

The primary function of the subscapular nerves is to provide motor innervation to the subscapularis and teres major muscles. These muscles play a vital role in the movement of the shoulder joint:

The subscapularis muscle is responsible for the internal rotation of the humerus and helps stabilize the head of the humerus in the glenoid cavity.
The teres major muscle assists in the adduction and medial rotation of the humerus.

Clinical significance[edit]

Injury to the subscapular nerves can result in weakness or paralysis of the subscapularis and teres major muscles, leading to impaired shoulder movement. Such injuries may occur due to trauma, surgical procedures, or compression by surrounding structures.

Related pages[edit]

@@ Line 1: / Line 1: @@
-'''Subscapular nerves''' are a group of [[nerves]] that originate from the [[brachial plexus]], specifically the posterior cord, and supply the [[subscapularis muscle]] and the [[teres major muscle]]. The term "subscapular" comes from Latin "sub" meaning under and "scapula" referring to the shoulder blade.
+{{Short description|Anatomy and function of the subscapular nerves}}
-==Etymology==
+==Subscapular nerves==
-The term "subscapular" is derived from the Latin words "sub" meaning under and "scapula" referring to the shoulder blade. The term "nerve" is derived from the Latin "nervus" meaning sinew or string.
+The '''subscapular nerves''' are a group of nerves that arise from the [[brachial plexus]] and innervate the [[subscapularis muscle]] and the [[teres major muscle]]. These nerves are crucial for the movement and stabilization of the [[shoulder joint]].
-==Anatomy==
+[[File:Gray807.png|thumb|right|Diagram of the brachial plexus, showing the subscapular nerves.]]
-The subscapular nerves consist of two nerves: the upper subscapular nerve and the lower subscapular nerve.
-===Upper Subscapular Nerve===
+===Anatomy===
-The [[upper subscapular nerve]] (also known as the superior subscapular nerve) originates from the [[C5]] and [[C6]] nerve roots of the brachial plexus. It innervates the subscapularis muscle, which is one of the four muscles that make up the [[rotator cuff]].
+The subscapular nerves originate from the posterior cord of the brachial plexus, which is formed by the union of the posterior divisions of the upper, middle, and lower trunks. Specifically, the subscapular nerves are derived from the C5 and C6 nerve roots.
-===Lower Subscapular Nerve===
+There are typically two subscapular nerves:
-The [[lower subscapular nerve]] (also known as the inferior subscapular nerve) originates from the [[C5]] and [[C6]] nerve roots of the brachial plexus. It innervates both the subscapularis muscle and the teres major muscle.
-==Clinical Significance==
+* The '''upper subscapular nerve''' (also known as the superior subscapular nerve) innervates the upper part of the subscapularis muscle.
-Damage to the subscapular nerves can result in weakness or paralysis of the subscapularis and teres major muscles. This can lead to difficulty in internal rotation and adduction of the arm.
+* The '''lower subscapular nerve''' (also known as the inferior subscapular nerve) innervates the lower part of the subscapularis muscle and the teres major muscle.
-==See Also==
+===Function===
+The primary function of the subscapular nerves is to provide motor innervation to the subscapularis and teres major muscles. These muscles play a vital role in the movement of the shoulder joint:
+* The [[subscapularis muscle]] is responsible for the internal rotation of the humerus and helps stabilize the head of the humerus in the glenoid cavity.
+* The [[teres major muscle]] assists in the adduction and medial rotation of the humerus.
+===Clinical significance===
+Injury to the subscapular nerves can result in weakness or paralysis of the subscapularis and teres major muscles, leading to impaired shoulder movement. Such injuries may occur due to trauma, surgical procedures, or compression by surrounding structures.
+==Related pages==
 * [[Brachial plexus]]
 * [[Subscapularis muscle]]
 * [[Teres major muscle]]
+* [[Shoulder joint]]
-==References==
-<references />
 [[Category:Peripheral nervous system]]
-[[Category:Anatomy]]
+[[Category:Anatomy of the upper limb]]
-{{stub}}