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Encyclopedia > Supraspinatus muscle

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Supraspinatus muscle

The supraspinatus is a relatively small muscle of the upper limb that takes its name from its origin from the supraspinous fossa superior to the spine of the scapula. It is one of the four rotator cuff muscles and also abducts the arm at the shoulder. The spine of the scapula separates the supraspinatus muscle from the infraspinatus muscle, which originates below the spine. The rotator cuff around the shoulder is formed by four muscles that attach to the scapula and insert onto the humerus, namely the:

Wikipedia does not yet have an article with this exact name. ...

Origin

The supraspinatus muscle arises from the supraspinous fossa, a shallow depression in the body of the scapular above its spine. The supraspinatus muscle tendon passes laterally beneath the cover of the acromion.


Insertion

The supraspinatus tendon is inserted into the most superior facet of the greater tubercle of the humerus. The distal attachments of the three rotator cuff muscles that insert into the greater tubercle of the humerus can be abbreviated as SIT when viewed from superior to inferior (Supraspinatus, Infraspinatus, and Teres minor). The much fabled mnemonic SITS regarding the rotator cuff muscles is completed by including the Subscapularis muscle, which unlike the other rotator cuff muslces attaches to the lesser tubercle of humerus. The humerus is an long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ...


Innervation

The supraspinatus muscle is supplied by the suprascapular nerve (C4, C5, and C6), which arises from the superior trunk of the brachial plexus and passes laterally through the posterior triangle of the neck and through the scapular notch on the superior border of the scapula. After supplying fibers to the supraspinatus muscle, it supplies articular branches to the capsule of the shoulder joint. The Nervus suprascapularis (Suprascapular nerve) is a nerve of the plexus brachialis. ...


This nerve can be damaged along its course in fractures of the overlying clavicle, which can reduce the person’s ability to initiate the abduction.


Action

Contraction of the supraspinatus muscle leads to abduction of the arm at the shoulder joint. It is often described as being the initiator of abduction as it is the main agonist muscle for this movement during the first 15 degrees of its arc. Beyond 15 degrees the deltoid muscle becomes increasingly more effective at abducting the arm and becomes the main propagator of this action. Look up abduction in Wiktionary, the free dictionary In logic, abduction is a method of reasoning; see abductive reasoning. ... The deltoid muscle is the muscle forming the rounded contour of the human shoulder. ...


The supraspinatus muscle is one of the musculotendinous support structures called the rotator cuff that surround and enclose the shoulder. It helps to resist the inferior gravitational forces placed across the shoulder joint due to the downward pull from the weight of the upper limb. The supraspinatus also helps to stabilise the shoulder joint by keeping the head of the humerus firmly pressed medially against the glenoid fossa of the scapula. The rotator cuff is an anatomical term given to the group of muscles and their tendons that act to stabilize the shoulder. ... In human anatomy, the shoulder joint is composed of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone) (see diagram). ...


The supraspinatus muscle tendon is often ruptured in sports involving sudden forceful movements of the upper limb and is the most commonly ruptured rotator cuff muscle. The muscle can also degenerate in the elderly leading to increased instability and loss of function at the shoulder joint.


  Results from FactBites:
 
Supraspinatus muscle - Wikipedia, the free encyclopedia (539 words)
The supraspinatus is a relatively small muscle of the upper limb that takes its name from its origin from the supraspinous fossa superior to the spine of the scapula.
The supraspinatus muscle is supplied by the suprascapular nerve (C4, C5, and C6), which arises from the superior trunk of the brachial plexus and passes laterally through the posterior triangle of the neck and through the scapular notch on the superior border of the scapula.
The supraspinatus muscle is one of the musculotendinous support structures called the rotator cuff that surround and enclose the shoulder.
Biceps brachii muscle - Wikipedia, the free encyclopedia (733 words)
These are the coracobrachialis muscle, which like the biceps attaches to the coracoid process of the scapula, and the brachialis muscle which connects to the ulna and the humerus.
It has also been proved through several tests into muscle group stimulation, that supination of the forearm with an isometric grip allows for close and normal-grip bench press exercises to have a much more profound effect on the biceps brachii and the clavicular portion of the pectorialis major.
Originally, supination of the forearm was attributed as a function of the brachioradialis muscle.
  More results at FactBites »

 
 

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