License Image The glenohumeral or shoulder joint, is a ball and socket joint. It is formed by the head of the humerus and the glenoid cavity of the scapula. Both are covered by articular cartilage and surrounded by a fibrous articular capsule. The glenoid cartilage thickens at the edge to form the fibrocartilaginous glenoid labrum, […]
Musculoskeletal
Rotator Cuff – Subscapularis Muscle
License Image The anterior view of the arm with the subscapularis, a “rotator cuff” muscle of the shoulder.
Rotator Cuff Muscles of the Shoulder
License Image The posterior view of the arm with the supraspinatus, infraspinatus, teres minor, and teres major “rotator cuff” muscles of the shoulder.
Rotator Cuff, Shoulder Joint
License Image This diagram illustrates the interior of the right shoulder joint capsule as viewed from the side. The humerus, or upper arm bone, has been removed to show the glenoid cavity of the scapula. The supraspinatus, infraspinatus, teres minor and subscapularis muscles are known as the shoulder “rotator” muscles. Their tendons blend with each […]
Glenoid Cavity
License Image The glenoid labrum is a fibrocartilaginous rim attached around the margin of the glenoid cavity of the scapula. The shoulder joint is considered a ‘ball and socket’ joint. The glenoid labrum helps to deepen the “socket”. It is continuous with the tendon of the long head of the biceps brachii, which blends with […]
Arm Bones
License Image anterior view The bones of the arm are the humerus, ulna and radius. The clavicle and the scapula form the shoulder girdle.
Arm Bones
License Image posterior view The bones of the arm are the humerus, ulna and radius. The clavicle and the scapula form the shoulder girdle.
Forearm Bones
License Image posterior view The bones of the arm are the humerus, ulna and radius. The olecranon fossa receives the olecranon process when the forearm is extended. The ulnar collateral ligament of the wrist attaches to the styloid process of the ulna. The radial collateral ligament of the wrist attaches to the styloid process of […]
Forearm Bones
License Image anterior view The bones of the arm are the humerus, ulna and radius. The distal end of the humerus consists of a cartilage covered condyle divided into two parts. The rounded capitulum articulates with the head of the radius. The trochlea articulates with the trochlear notch of the ulna. The coronoid fossa receives […]
Humerus
License Image The humerus is the largest bone in the arm. The head of the humerus, covered with cartilage, articulates with the glenoid cavity of the scapula to form the shoulder joint. The anatomical neck marks the point of attachment of the joint capsule. The surgical neck is frequently the site of fracture. The supraspinatus, […]
Radioulnar Joint
License Image The proximal radioulnar joint is the joint formed by the head of the radius, the annular ligament and the ulna. The band-like annular ligament circles the head of the radius where it fits snugly into the radial notch of the ulna. This joint allows a rotary movement of the head of the radius. The action […]
Elbow Joint
License Image lateral view The elbow joint is a hinge joint composed of three bones: the humerus, the radius and the ulna. In this image the capitulum of the humerus articulates with the slightly cupped surface on the head of the radius to form the radiohumeral joint. This is the lateral view of the elbow […]
Elbow Joint
License Image medial view The elbow joint is a hinge joint composed of three bones: the humerus, the radius and the ulna. The Humeroulnar joint is the junction of the trochlea of the humerus and the trochlear notch of the ulna. This is the medial view of the elbow joint.
Biceps Brachii Muscle
License Image Anterior view of the arm showing the biceps brachii muscle .
Brachialis Muscle
License Image Anterior view of the brachialis and coracobrachialis muscles of the arm.
Forearm Muscles – Flexors
License Image superficial flexors The muscles of the forearm can be divided into two groups: anterior (flexors) and posterior (extensors). Both the flexors and extensors are further divided into superficial and deep layers. The forearm muscles that control the movement of the hands are known as extrinsic hand muscles. These muscles originate outside the hand […]
Forearm Muscles – Flexors
License Image deep flexors The deep flexors of the forearm are the flexor pollicis longis, flexor digitorum profundus and the pronator quadratus. The digitorum profundus flexes the four fingers and the pollicis longis flexes the thumb. (Closing your hand into a fist flexes the fingers and thumb). The pronator quadratus pronates the forearm and hand.
Forearm Muscles – Extensors
License Image superficial extensor The superficial extensors of the forearm are the brachioradialis, extensor carpi radialis longus, anconeus, extensor carpi radialis brevis, extensor carpi ulnaris, extensor digitorum and extensor digiti minimi. The extrinsic hand muscles originate in the forearm and insert on structures within the hand. They control movements of the wrist, hand, fingers and […]
