Teres muscle: Difference between revisions

Latest revision as of 21:41, 29 December 2024

The teres muscles are two muscles of the shoulder that connect the scapula to the humerus. These muscles are the teres major muscle and the teres minor muscle.

Teres Major Muscle[edit]

The teres major muscle is a thick, flattened muscle that originates from the lower part of the scapula and inserts into the medial lip of the intertubercular sulcus of the humerus. It is primarily responsible for the adduction and medial rotation of the arm. The teres major is innervated by the lower subscapular nerve and receives blood supply from the circumflex scapular artery.

Teres Minor Muscle[edit]

The teres minor muscle is a narrow, elongated muscle that originates from the lateral border of the scapula and inserts into the greater tubercle of the humerus. It is part of the rotator cuff and is involved in the lateral rotation of the arm. The teres minor is innervated by the axillary nerve and also receives blood supply from the circumflex scapular artery.

Function[edit]

The teres muscles play a crucial role in the movement and stabilization of the shoulder joint. The teres major muscle assists in adduction and medial rotation of the arm, while the teres minor muscle is involved in lateral rotation and stabilization of the humerus within the glenoid cavity.

Clinical Significance[edit]

Injuries to the teres muscles can affect shoulder movement and stability. The teres minor muscle is particularly important in maintaining the integrity of the rotator cuff, and damage to this muscle can lead to rotator cuff tears or shoulder impingement syndrome.

References[edit]

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-'''Teres Major Muscle'''
-[[File:Teres major muscle.PNG|thumb|right|Teres major muscle]]
+{{Infobox muscle
+| Name         = Teres muscle
+| Latin        = Musculus teres
+| Image        = Gray412.png
+| Caption      = The teres major and teres minor muscles, shown in relation to the [[scapula]].
+| Origin       = [[Scapula]]
+| Insertion    = [[Humerus]]
+| Blood        = [[Circumflex scapular artery]]
+| Nerve        = [[Axillary nerve]] (teres minor), [[Lower subscapular nerve]] (teres major)
+| Action       = [[Arm]] rotation and adduction
+}}
-The '''Teres Major Muscle''' is a muscle of the upper limb and one of the seven scapulohumeral muscles. It is positioned in the superior part of the posterior compartment of the arm, and is a thick and ovoid muscle in a quadrangular form.
+The '''teres muscles''' are two muscles of the [[shoulder]] that connect the [[scapula]] to the [[humerus]]. These muscles are the [[teres major muscle]] and the [[teres minor muscle]].
-== Anatomy ==
+==Teres Major Muscle==
+The [[teres major muscle]] is a thick, flattened muscle that originates from the lower part of the [[scapula]] and inserts into the medial lip of the intertubercular sulcus of the [[humerus]]. It is primarily responsible for the [[adduction]] and [[medial rotation]] of the [[arm]]. The teres major is innervated by the [[lower subscapular nerve]] and receives blood supply from the [[circumflex scapular artery]].
-The Teres Major Muscle originates from the posterior aspect of the [[inferior angle]] and the lower part of the lateral border of the [[scapula]]. It inserts at the medial lip of the [[intertubercular sulcus]] of the [[humerus]].
+==Teres Minor Muscle==
+The [[teres minor muscle]] is a narrow, elongated muscle that originates from the lateral border of the [[scapula]] and inserts into the greater tubercle of the [[humerus]]. It is part of the [[rotator cuff]] and is involved in the [[lateral rotation]] of the [[arm]]. The teres minor is innervated by the [[axillary nerve]] and also receives blood supply from the [[circumflex scapular artery]].
-== Function ==
+==Function==
+The teres muscles play a crucial role in the movement and stabilization of the [[shoulder joint]]. The [[teres major muscle]] assists in [[adduction]] and [[medial rotation]] of the [[arm]], while the [[teres minor muscle]] is involved in [[lateral rotation]] and stabilization of the [[humerus]] within the [[glenoid cavity]].
-The Teres Major Muscle is a medial rotator and adductor of the humerus and assists in drawing the previously raised humerus downward and backward (extension, but inferior to the horizontal plane). It also helps stabilise the humeral head in the [[glenoid cavity]].
+==Clinical Significance==
+Injuries to the teres muscles can affect shoulder movement and stability. The [[teres minor muscle]] is particularly important in maintaining the integrity of the [[rotator cuff]], and damage to this muscle can lead to [[rotator cuff tear]]s or [[shoulder impingement syndrome]].
-== Clinical Significance ==
+==See Also==
-Injury to the Teres Major Muscle can result in a condition known as [[winged scapula]], which is characterised by the scapula protruding from the back in an abnormal position.
-== See Also ==
-* [[Scapulohumeral muscles]]
 * [[Rotator cuff]]
+* [[Shoulder joint]]
+* [[Scapula]]
+* [[Humerus]]
-== References ==
+==References==
+* [[Gray's Anatomy]]
+* [[Netter's Atlas of Human Anatomy]]
-<references />
+{{Muscles of upper limb}}
 [[Category:Muscles of the upper limb]]
-[[Category:Scapulohumeral muscles]]
+[[Category:Shoulder anatomy]]
-{{anatomy-stub}}
+[[Category:Musculoskeletal system]]