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Lecture 2: Cubital fossa and forearm muscles
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Contains lecture notes for lecture 2 of ANA152
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Lecture 2: Muscular System CubitalFossa and Forearm Muscles
Upper arm
Forearm
Anterior compartment
Consists of 8 muscles: innervated by the median and ulnar nerves
Divided into 3 muscle groups
Superficial (4 muscles)
Intermediate (1 muscle)
Deep (3 muscles)
Forearm (anterior)
Superficial group
1. Pronator teres
Origin: medial epicondyle and coronoid process of the ulna
Insertion: the lateral aspect of the radial shaft
Action: flexion and pronation
Innervation: median nerve
2. Flexor carpi radialis
Origin: medial epicondyle
Insertion: base of the 2nd and 3rd metacarpals
Action: stabilisation of the wrist and flexion of the wrist and elbow
Innervation: median nerve
3. Palmaris longus
Origin: medial epicondyle
Insertion: Palmar aponeurosis
Action: Tenses palmar fossa
Innervation: median nerve
4. Flexor carpi ulnaris
Origin: medial epicondyle and coronoid process of the ulna
Insertion: pisiform by the pisihamate and pisimetacarpal ligaments
Action: flexion and adduction of the wrist
Innervation: ulnar nerve
Intermediate group
1. Flexor digitorum superficialis
Origin: medial epicondyle, radius and coronoid process of the ulna
Insertion: base of the middle phalanges of the 4 medial fingers
Action: flexion of the joins that the tendons pass
Innervation: median nerve
, Deep group
1. flexor digitorum profundus
Origin:
3
Upper of the anterior and medial surfaces of the ulna shaft
4
Interosseous membrane
Insertion: base of the distal phalanges of the 4 medial fingers
Action: flexion of the joints that the tendons pass
Innervation: median (laterally) and ulnar (medially) nerves
2. Flexor pollicis longus
Origin: upper anterior surface of the radial shaft
Insertion: distal phalanx of the thumb
Action: flexion of the thumb and wrist
Innervation: median nerve
3. Pronator quadratus
Origin: distal surface of anterior and medial aspects of the ulna shaft
Insertion: the distal surface of the anterior and medial aspects of the radial shaft
Action: pronation
Innervation: median nerve
Cubital fossa
Transitional zone between the brachium and the antebrachium
Inverted triangle by the elbow that is covered by skin and fascia
Base: imaginary lines between the epicondyles
Lateral border: medial border of the brachioradialis
Medial border: lateral border of the pronator teres
Roof: skin, fascia, superficial nerves and vessels
Floor: brachialis and supinator muscles
Contents
Biceps brachii tendon Muscle
Brachial artery Artery
Median nerve
Carpal tunnel
Nerve
Flexors of the digits enter the carpal tunnel
Formed by the medial and lateral carpal pillars
Completed by the flexor retinaculum
Carpal tunnel syndrome
Inflammation of the tendons
Impingement of the median nerve
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