Items tagged “muscle”

41 results found
Article

Infraspinatus

Infraspinatus is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, teres minor and subscapularis. origin: infraspinatus fossa of the scapula insertion: greater tuberosity of the humerus innervation: suprascapular nerve (C5-6) action: external rotation G...
Case

Psoas muscle haemangioma

 Diagnosis almost certain
Dr Roberto Schubert
Published 31 Jan 2012
42% complete
MRI
Case

Ganglion cysts of the distal vastus lateralis compartment

 Diagnosis almost certain
Dr Roberto Schubert
Published 29 Mar 2012
59% complete
MRI
Article

Muscles of the shoulder

Muscles of the shoulder can be subdivided into a variety of groups depending on origin, topography, function or innervation. The system used here groups muscles based on function and topography (which are closely related in the upper limb): Muscles of the shoulder girdle Muscles that have migr...
Article

Deltoid muscle

The deltoid muscle is the largest of the shoulder muscles. The muscle is composed of three heads (clavicular, acromial and spinous), although electromyography suggests that there are at least seven control regions that could act independently 1. Summary origin: lateral 1/3 of the clavicle, acr...
Article

Supraspinatus muscle and tendon

Supraspinatus is one of the four muscles that make up the rotator cuff, the others being: infraspinatus, teres minor and subscapularis. Summary origin: supraspinous fossa of the scapula insertion: greater tuberosity of the humerus innervation: suprascapular nerve (C5-6) action: shoulder abd...
Article

Teres major

Teres major is one of the seven scapulohumeral muscles that act around the glenohumeral joint to facilitate shoulder movement. Summary origin: caudal two thirds of lateral border and inferior angle of scapula insertion: medial border of the intertubercular goove, which is the crest of lesser ...
Article

Coracobrachialis

The coracobrachialis is one of the three muscles of the anterior compartment of the arm. It sits beneath the biceps brachii, inserting via a flat tendon into the medial shaft of the humerus. origin: coracoid process of scapula insertion: via a flat tendon onto the midportion of the medial surf...
Article

Triceps brachii

The triceps brachii, which often referred to simply as the triceps is a three-headed muscle in the posterior compartment of the arm. Summary origin long head: infraglenoid tubercle of the scapula medial head: posterior humerus, inferior to the radial groove, medial intermuscular septum late...
Article

Anconeus

The anconeus is a small muscle in the posterior compartment of the arm at the lateral aspect of the elbow. It has little functional significance but should be differentiated from the variably present anconeus epitrochlearis at the medial aspect of the elbow. Summary origin: lateral epicondyle ...
Article

Articularis cubiti

The articularis cubiti is a muscle in the posterior compartment of the arm: origin: posterior surface of the distal humerus insertion: posterior surface of the elbow joint capsule innervation: radial nerve action: tenses the posterior elbow joint capsule during elbow extension
Article

Pronator teres

Pronator teres is a two-headed flexor and pronator of the forearm, found superficially in the anterior compartment of the forearm. Summary origin humeral head: medial epicondyle of the humerus ulnar head: coronoid process of the ulna insertion: lateral surface of the middle-third radius in...
Article

Flexor carpi radialis

Flexor carpi radialis (FCR) is a muscle found in the first layer of the anterior compartment of the forearm. It does not pass through the carpal tunnel, but rather by itself in a small separate tunnel between the superficial and deep layers of the flexor retinaculum along the scaphoid and trapez...
Article

Palmaris longus

Palmaris longus (PL) is a superficial, weak flexor of the wrist located in the anterior compartment of the forearm. Summary origin: medial epicondyle of the humerus insertion: palmar aponeurosis innervation: median nerve action: weak flexor of the wrist and elbow; tightens palmar aponeurosi...
Article

Pectoralis major

The pectoralis major muscle is a muscle of the pectoral region, overlying the anterior chest wall but is considered an upper limb muscle due to its function.  Summary origin sternal part: sternum and superior six costal cartilages clavicular part: medial half of the clavicle insertion: late...
Article

Latissimus dorsi

Latissimus dorsi is one of the muscles that attaches the upper limb to the vertebral column. Summary origin: spinous processes of T7-T12 and thoracolumbar fascia; posterior third of the iliac crest; 9th-12th ribs, inferior angle of the scapula insertion: floor of the bicipital groove of the h...
Article

Levator scapulae

Levator scapulae is a muscle of the upper limb that connects the pectoral girdle to the cervical spine. Summary origin: C1-C4 transverse processes insertion: superior angle of the scapula innervation: direct branches from the C3-4 spinal nerves, and the dorsal scapular nerve (C5) action el...
Article

Serratus anterior

Serratus anterior arises from the lateral chest wall as eight interdigitations of muscle that run posteriorly around the chest wall, under the scapula to insert onto the medial scapula.  Summary origin: anterolateral ribs 1-8 insertion: medial border of the scapula innervation: long thoracic...
Article

Subclavius muscle

The subclavius muscle is a small triangular muscle that depresses the shoulder. It is a minor member of the anterior group of muscles of the pectoral girdle.  Summary origin: 1st costochondral joint insertion: subclavian groove on the inferior aspect of the clavicle innervation: nerve to sub...
Article

Flexor carpi ulnaris

Flexor carpi ulnaris (FCU) is a muscle of the first layer of the anterior compartment of the forearm. Summary origin humeral head: medial epicondyle of the humerus ulnar head: medial border of olecranon and posterior border of ulna insertion: base of 5th metacarpal; hook of hamate, pisiform...

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