Upper Limb

Acromioclavicular Joint

Acromioclavicular Joint The structure indicated is the acromioclavicular joint. The shoulder joint complex consists of the three joints: Glenohumeral joint Acromioclavicular joint Sternoclavicular joint The acromioclavicular joint is formed between the acromion of the scapula and the clavicle. It is a small synovial joint that is stabilised by the following ligaments: Acromioclavicular ligament (consists of superior and inferior parts) Coracoclavicular ligaments The coracoclavicular ligaments consist of two parts: Trapezoid ligament Conoid ligament Learn more about the shoulder joint in this anatomy tutorial.

acromioclavicular joint

Extensor Carpi Radialis Brevis

Extensor Carpi Radialis Brevis The structure indicated is the extensor carpi radialis brevis muscle of the forearm. The extensor carpi radialis brevis muscle is one of 7 muscles located in the superficial compartment of the posterior forearm. The posterior forearm consists of a superficial and a deep compartment. The superficial compartment contains 7 muscles, whereas the deep compartment contains 5 muscles. The superficial compartment of the posterior forearm includes the following 7 muscles: Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris Anconeus The extensor carpi radialis brevis muscle serves to abduct and extend the wrist joint. The muscles of the …

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extensor carpi radialis brevis

Infraspinatus

Infraspinatus The structure indicated is the infraspinatus muscle of the rotator cuff. The infraspinatus muscle is one of the four muscles of the rotator cuff. The rotator cuff muscles are located in the posterior scapula region and serve to stabilise the glenohumeral joint. There are 4 rotator cuff muscles which can be remembered using the mnemonic SITS: Supraspinatus Infraspinatus Teres minor Subscapularis The supraspinatus and infraspinatus, as their names suggest originate in the fossae above and below the spine of the scapula respectively (supraspinatous and infraspinatous fossae). The supraspinatus, infraspinatus and teres minor muscles insert on to the greater tubercle …

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Infraspinatus

Extensor Digiti Minimi

Extensor Digiti Minimi The structure indicated is the extensor digiti minimi muscle. The extensor digiti minimi muscle is one of 7 muscles located in the superficial compartment of the posterior forearm. The posterior forearm consists of a superficial and a deep compartment. The superficial compartment contains 7 muscles, whereas the deep compartment contains 5 muscles. The superficial compartment of the posterior forearm includes the following 7 muscles: Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris Anconeus The muscles of the posterior compartment of the forearm originate from the lateral epicondyle of the humerus and the supraepicondylar ridge and they are all innervated by …

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extensor digiti minimi

Median Antebrachial Vein

Median Antebrachial Vein The structure indicated is the median antebrachial vein. The median antebrachial vein is one of the veins of the superficial venous system of the upper limb. The veins of the upper limb consist of a superficial veins and deep veins. The superficial system consists primarily of the cephalic and basilic veins which originate from the dorsal venous arch and drain into the axillary vein and brachial veins respectively. In the region of the antecubital fossa, the cephalic vein is joined to the basilic vein via a vein known as the median cubital vein. The median antebrachial vein originates …

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median antebrachial vein

Brachialis

Brachialis The structure indicated is the brachialis muscle. The brachialis muscle is one of three muscles in the anterior compartment of the arm: Biceps brachii Brachialis Coracobrachialis The muscles of the anterior compartment are innervated by the musculocutaneous nerve and generally serve to flex the forearm at the elbow joint. The brachialis muscle lies deep to the biceps brachii muscle and is synergistic in its action, assisting with flexion of the forearm at the elbow joint. Origin: Distal half of anterior humerus Insertion: Ulna tuberosity Action: Flexion of elbow Innervation: Musculocutaneous nerve Learn more about the anatomy of the arm …

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Brachialis

Radial Vein

Radial Vein The structure indicated is the radial vein of the forearm. The venous drainage of the upper limb consists of a superficial system and a deep system. The superficial system drains to the deep system. The veins of the deep system accompany the arteries, and are known as venae comitantes which is the Latin for “accompanying veins” (vena comitans = singular). The veins which accompany the arteries are often in pairs, and are therefore frequently referred to in the plural form – venae comitantes. The radial veins are paired veins which accompany the radial artery in the forearm. The …

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radial vein

Biceps Brachii – Long Head

Biceps Brachii – Long Head The structure indicated is the long head of the biceps brachii muscle. The biceps muscle is one of three muscles in the anterior compartment of the arm: Biceps brachii Brachialis Coracobrachialis The muscles of the anterior compartment are innervated by the musculocutaneous nerve and generally serve to flex the forearm at the elbow joint. The biceps brachii muscle is comprised of two muscular heads: Short head Long head The long head of the biceps brachii originates on the supraglenoid tubercle of the scapula, and traverses the superior aspect of the glenohumeral joint to descend in …

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biceps brachii long head

Trochlea of Humerus

Trochlea of Humerus The structure indicated is the trochlea of the humerus. The distal end of the humerus consists of several features: Condyle, consisting of the capitulum and trochlea Medial and lateral epicondyles Medial and lateral supracondylar ridges Radial fossa, coronoid fossa, olecranon fossa A large central condyle which has two articular components – the capitulum is the lateral articular component and articulates with the radius, and the trochlea is the medial component which articulates with the ulna. Learn more about the anatomy of the elbow joint in this tutorial.

Trochlea

Teres Minor

Teres Minor The structure indicated is the teres minor muscle. The teres minor muscle is one of the four muscles of the rotator cuff. The rotator cuff muscles are located in the posterior scapula region and serve to stabilise the glenohumeral joint. There are 4 rotator cuff muscles which can be remembered using the mnemonic SITS: Supraspinatus Infraspinatus Teres minor Subscapularis The supraspinatus and infraspinatus, as their names suggest originate in the fossae above and below the spine of the scapula respectively (supraspinatous and infraspinatous fossae). The supraspinatus, infraspinatus and teres minor muscles insert on to the greater tubercle of …

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Teres minor