Items tagged “muscle”

43 results found
Article

Piriformis

The piriformis muscle is a muscle in the gluteal region of the lower limb. Summary origin: sacrum course: exits the pelvis through the greater sciatic foramen insertion: greater trochanter of the femur action: abduction and lateral rotation of the thigh arterial supply superior gluteal ar...
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 the muscles based on their function and topography (which are closely related in the upper limb): Muscles of the shoulder girdle Muscles that...
Article

Supraspinatus muscle

The supraspinatus muscle 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: superior facet of the greater tubercle of the humerus innervation: suprascapular ne...
Article

Infraspinatus muscle

The Infraspinatus muscle 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: middle facet of the greater tubercle of the humerus innervation: suprascapular nerve (C5-6) ...
Article

Biceps femoris muscle

The biceps femoris is one of the large muscles in the posterior compartment of the thigh and a component of the hamstrings. It has a long and a short head, each with different functions and innervation. Its medial border forms the superolateral border of the popliteal fossa. Summary origin l...
Article

Lateral rectus muscle

The lateral rectus muscle is one of the 6 extraocular muscles that control eye movements. It is responsible for abduction and is the only muscle that is innervated by the abducens nerve (CN VI). It should normally measure 2.9 ± 0.6 mm. Summary innervation: abducens nerve (CN VI) origin: annul...
Article

Sternocleidomastoid muscle

The sternocleidomastoid muscle (also known as sternomastoid) is found in the neck. It has two heads that meld to form one insertion. Sternocleidomastoid muscle, along with the trapezius muscle, is invested by the superficial layer of the deep cervical fascia, which splits around it. Sternocleido...
Article

Anconeus epitrochlearis

The anconeus epitrochlearis is an accessory muscle at the medial aspect of the elbow. It is also known as the accessory anconeus muscle or epitrochleoanconeus muscle and should not be confused with the anconeus muscle which is present at the lateral aspect of the elbow.  Epidemiology The muscl...
Article

Pectoralis major muscle

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...
Case

Psoas muscle hemangioma

 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

Deltoid muscle

The deltoid muscle (also known as deltoideus 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...
Article

Teres major muscle

Teres major muscle 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 groove, which is the crest of...
Article

Coracobrachialis muscle

The coracobrachialis muscle 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 medi...
Article

Triceps brachii muscle

The triceps brachii muscle, 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 septu...
Article

Anconeus muscle

The anconeus muscle 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 epic...
Article

Articularis cubiti muscle

The articularis cubiti muscle lies 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 ar...
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. It is one of the extrinsic muscles of the hand. Summary origin: medial epicondyle of the humerus insertion: palmar aponeurosis arterial supply: anterior ulnar recurrent artery ...

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