Items tagged “illustrations”

38 results found


The brachialis muscle (brachialis) is one of the three muscles of the anterior compartment of the arm. It is only involved in flexion at the elbow and therefore the strongest flexor at the elbow, compared with the biceps brachii which is also involved in supination because of its insertion on th...

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...


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 ...

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

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...

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...

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...

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...

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) arterial s...

Pectoralis minor

Pectoralis minor is a muscle of the anterior chest wall that inserts into the pectoral girdle. It lies deep to and is completely covered by pectoralis major.  It is an important anatomical landmark in two senses: it divides the axillary artery into 3 parts it divides the axillary lymph nodes ...

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 or 1-9 insertion: medial border of the scapula innervation: long t...

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...

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...

Posterior compartment of the forearm

The forearm is divided into the posterior compartment and the anterior compartment by the deep fascia, lateral intermuscular septum and the interosseous membrane between the ulna and radius.  Muscles The posterior compartment of the forearm contains 11 muscles, divided into deep and superficia...

Flexor retinaculum at the ankle

Flexor retinaculum at the ankle is formed by reinforcement of the deep fascia of the leg by transverse collagen bundles and functions to prevent 'bowstringing' of tendons as they pass the tibiotalar joint. It forms the roof of the tarsal tunnel 1-2. Attachments medial malleolus of the tibia m...

McBurney point

McBurney point is defined as a point that lies one-third of the distance laterally on a line drawn from the umbilicus to the right anterior superior iliac spine. Classically, it corresponds to the location of the base of the appendix 1. Clinically, McBurney point is relevant for the elicitation...

Femoral triangle

The femoral triangle is found in the anterior upper thigh. Gross anatomy Boundaries The major boundaries can be recalled with the mnemonic SAIL 1,2: lateral border: medial border of sartorius medial border: medial border of adductor longus superior border: inguinal ligament floor: iliopso...

Iliotibial band (ITB) anatomy: diagrams

 Diagnosis not applicable
Dr Matt Skalski
Published 21 May 2015
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