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Encyclopedia > Supraspinatus

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.

Contents


Origin

The supraspinatus muscle arises from the supraspinous fossa, a shallow depression in the body of the scapula 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 a 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. In human and zoological anatomy (sometimes called zootomy), several terms are used to describe the location of organs and other structures in the body of bilateral animals. ... 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 rotator cuff around the shoulder is formed by four muscles that attach to the scapula and insert onto the humerus, namely the: The rotator cuff is an anatomical term given to the group of muscles and their tendons that act to stabilize the shoulder. ... The human upper arm In human anatomy, the shoulder joint is composed of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone). ...

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 Infraspinatus muscle is a lateral rotator of the glenohumeral joint. ... Wikipedia does not yet have an article with this exact name. ... The Subscapularis muscle is a muscle of the human body. ...


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.

Muscles of the Head -- Neck -- Trunk -- Upper limb -- Lower limb -- LIST OF ALL MUSCLES

VERTEBRAL COLUMN: levator scapulae | rhomboid (major, minor) | serratus anterior | latissimus dorsi A top-down view of skeletal muscle Muscle is a contractile form of tissue. ... This is a list of muscles of the human anatomy. ... The vertebral column seen from the side Different regions (curvatures) of the vertebral column The vertebral column (backbone or spine) is a column of vertebrae situated in the dorsal aspect of the abdomen. ... Location The levator scapulae takes its origin from the posterior tubercles of the tranverse processes of the C1 to C4 vertebrae. ... Location The rhomboid major takes its origin from the spinous processes of the T2 to T5 vertebrae. ... Location The rhomboid minor takes its origin from the nuchal ligaments and spinous processes of C7 to T1 vertebrae. ... Serratus anterior Serratus anterior muscle is the surface of upper 9 ribs at side of chest - anterior aspect along entire length of medial border of scapula - (protraction) draws medial border of scapula away from vertebrae (upward rotation). ... Latissimus dorsi is a large flat muscle located on the back. ...


ANTERIOR AND LATERAL THORACIC WALLS: pectoralis (major, minor) | subclavius The thoracic cavity is the chamber of the human body (and other animal bodies) that is enclosed by the ribcage and the diaphragm. ... Pectoralis major Location The clavicular head of the pectoralis major takes its origin from the anterior surface of the medial half of the clavicle. ... Location The pectoralis minor muscle takes its origin from the 3rd to 5th ribs, near their costal cartilages. ... The Subclavius muscle is a muscle of the human body. ...


SHOULDER AND ROTATOR CUFF: deltoid | infraspinatus | subscapularis | supraspinatus | teres (major, minor) The human upper arm In human anatomy, the shoulder joint is composed of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone). ... The rotator cuff is an anatomical term given to the group of muscles and their tendons that act to stabilize the shoulder. ... The deltoid muscle is the muscle forming the rounded contour of the human shoulder. ... The Infraspinatus muscle is a lateral rotator of the glenohumeral joint. ... The Subscapularis muscle is a muscle of the human body. ... Teres major is a muscle of the upper limb and one of six scapulohumeral muscles. ... Wikipedia does not yet have an article with this exact name. ...


ARM: anconeus | biceps brachii | triceps brachii | brachialis | coracobrachialis ARM may stand for: Most likely: ARM Ltd (originally Advanced RISC Machines) ARM architecture CPU design or one of its derivatives developed by ARM Ltd (originally called The Acorn RISC Machine) Adjustable rate mortgage Annotated Reference Manual (C++) Artificial rupture of membranes (see amniotic sac) the ISO 3166-1 3... The anconeus muscle is a small muscle on the posterior surface of the elbow. ... A person flexing his biceps brachii In human anatomy, the biceps brachii is a muscle on the upper arm that acts to flex the elbow. ... Triceps brachii The triceps brachii muscle is a large three-headed skeletal muscle found in humans. ... Brachialis is a flexor muscle in the upper arm. ... The coracobrachialis is one of the three muscles that attach to the coracoid process of the scapula. ...


FOREARM: brachioradialis | extensor carpi radialis (brevis, longus) | extensor carpi ulnaris | extensor digiti minimi | extensor digitorum | extensor pollicis longus | flexor carpi radialis | flexor carpi ulnaris | flexor digitorum (profundus, superficialis) | flexor pollicis brevis | pronator (quadratus, teres) | palmaris longus | supinator The forearm is the structure on the upper limb, between the elbow and the wrist. ... Brachioradialis is a muscle located in the forearm, that acts to flex the forearm. ... The extensor carpi radialis brevis is specific human muscle. ... Extensor carpi radialis longus is one of the five main muscles that control movement at the wrist. ... Extensor carpi ulnaris is a muscle, located in the forearm of human bodies that acts to extend and adduct the wrist. ... The extensor digiti minimi is a muscle of the forearm that extends the little finger at all joints. ... The Extensor digitorum muscle is a muscle of the human body. ... The Extensor pollicis longus muscle is a muscle of the human body. ... In anatomy, flexor carpi radialis is a muscle of the human forearm that acts to flex and abduct the hand. ... In anatomy, flexor carpi ulnaris muscle is a muscle of the human forearm that acts to flex and adduct the hand. ... The flexor digitorum profundis is a muscle in the forearm that flexes the fingers. ... Flexor digitorum superficialis is an extrinsic flexor muscle of the fingers. ... The Flexor pollicis brevis muscle is a muscle of the human body. ... Pronator quadratus is a square shaped muscle on the distal forearm that acts to pronate (turn so the palm faces downwards) the hand. ... The Pronator teres muscle is a muscle of the human body, in the forearm. ... The Palmaris longus muscle is a muscle of the human body. ... The Supinator muscle is a muscle of the human body. ...


HAND: abductor pollicis longus | adductor pollicis | dorsal interossei | extensor pollicis brevis | palmar interossei | palmaris brevis | opponens digiti minimi | lumbrical | thenar eminence (abductor pollicis brevis, flexor pollicis longus, | opponens pollicis) A human hand typically has four fingers and a thumb The hand (med. ... The Abductor pollicis longus muscle is a muscle of the human body. ... The Adductor pollicis muscle is a muscle of the human body. ... The Dorsal interossei muscles is a muscle of the human body. ... The Extensor pollicis brevis muscle is a muscle of the human body. ... The Palmar interossei muscles is a muscle of the human body. ... The Palmaris brevis muscle is a muscle of the human body. ... The Opponens digiti minimi muscle is a muscle of the human body. ... The lumbrical muscles are intrinsic muscles in the fingers that allow flexion at the metacarpophalangeal joints, while maintaining extension at the interphalangeal joints. ... The thenar eminence is the body of muscle on the palm of the human hand just beneath the thumb. ... The Abductor pollicis brevis muscle is a muscle of the human body. ... The Flexor pollicis longus muscle is a muscle of the human body. ... The Opponens pollicis muscle is a muscle of the human body. ...


  Results from FactBites:
 
eMedicine - Supraspinatus Tendonitis : Article Excerpt by: Wing K Chang, MD (608 words)
The common belief is that impingement of the supraspinatus tendon leads to supraspinatus tendonitis (inflammation of the supraspinatus/rotator cuff tendon and/or the contiguous peritendinous soft tissues), which is a known stage of shoulder impingement syndrome (stage II) as described originally by Neer in 1972.
It accommodates passage and excursion of the supraspinatus tendon.
These various impingement sites in the supraspinatus outlet are compressed further when the humerus is placed in the forward flexed and internally rotated position, forcing the greater tuberosity of the humerus into the undersurface of the acromion and coracoacromial arch.
  More results at FactBites »

 
 

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