Items tagged “muscle”

41 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 muscles based on function and topography (which are closely related in the upper limb): Muscles of the shoulder girdle Muscles that have migr...
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) arterial supply: sup...
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) arterial supply: suprascapul...
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. Summary origin long head: tuberosity of the ischium short head: linea aspera on the poste...
Article

Lateral rectus muscle

The lateral rectus muscle is one of the 6 extra-ocular 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 ± 0.6mm. Summary innervation: abducens nerve (CN VI) origin: Annul...
Article

Sternocleidomastoid muscle

The sternocleidomastoid (SCM) is a muscle of the neck. It has two heads that meld to form one insertion. SCM, along with the trapezius muscle, is invested by the superficial layer of the deep cervical fascia, which splits around it. SCM divides the neck into anatomical anterior and posterior tri...
Article

Anconeus epitrochlearis

Anconeus epitrochlearis is an accessory muscle at the medial aspect of the elbow. It is also known as the accessory anconeus muscle and should not be confused with the anconeus muscle which is present at the lateral aspect of the elbow.  Epidemiology The muscle may be unilateral but has been f...
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...
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

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

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 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. Summary origin: medial epicondyle of the humerus insertion: palmar aponeurosis arterial supply: anterior ulnar recurrent artery  innervation: median nerve action: weak flexor...

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