Extensor Compartment of Upper Limb and Upper Back Flashcards
Origin of long head of triceps brachii
Infraglenoid tubercle
Origin of lateral head of triceps brachii
Humerus, superior to the radial groove
Origin of medial head of triceps brachii
Humerus, inferior to radial groove
Attachment of triceps brachii
The heads converge onto one tendon and insert into the olecranon of the ulna
Function of triceps brachii
Extension of the arm at the elbow
Innervation of triceps brachii
Radial nerve
How many muscles are in the superficial layer of the posterior forearm
7
Origin and attachments of brachioradialis
Originates from the lateral supracondylar ridge of humerus
Attaches to the distal end of the humerus
Actions of brachioradialis
Flexes at the elbow
Innervation of brachioradialis
Radial nerve
Origin and attachments of extensor carpi radialis longus
Originates from the supracondylar ridge
Their tendons attach to metacarpal bones II and III
Origin and attachments of extensor carpi radialis brevis
Originates from the lateral epicondyle
Their tendons attach to metacarpal bones II and III
Action of extensor carpi radialis longus and brevis
Extends and abducts the wrist
Innervation of extensor carpi radialis longus and brevis
Radial nerve
Origin and attachment of extensor digitorum
Originates from lateral epicondyle
Splits into four and inserts into the extensor hood of each finger
Action of extensor digitorum
Extends four fingers at metacarpophalangeal joint and interphalangeal joints
Innervation of extensor digitorum
Radial nerve (deep branch)
Origin and attachment of extensor digiti minimi
Originates from lateral epicondyle
Attaches with the extensor digitorum tendon into the extensor hood of the little finger
Actions of extensor digiti minimi
Extends the little finger
Contributes to extension at the wrist
Innervation of extensor digiti minimi
Radial nerve (deep branch)
Origin and attachment of extensor carpi ulnaris
Originates from the lateral epicondyle
Attaches to base of metacarpal V
Action of extensor carpi ulnaris
Extension and adduction of wrist
Innervation of extensor carpi ulnaris
Radial nerve (deep branch)
Origin and attachment of anconeus
Originates from lateral epicondyle
Attaches to olecranon
Action of anconeus
Extends and stabilises elbow joint
Abducts the ulna during pronation of the arm
Innervation of anconeus
Radial nerve
How many muscles are in the deep compartment of the posterior forearm
5
With the exception of the supinator, the deep muscles in the posterior forearm act on …
Thumb and index finger
The deep branch of the radial nerve passes between the two heads of which muscle
Supinator
Origin and attachment of the supinator
One head originates from lateral epicondyle and the other from the posterior surface of the ulna
Attaches to the posterior surface of the radius
Actions of supinator
Supinates the forearm
Innervation of supinator
Radial nerve
Origin and attachment of abductor pollicis longus
Originates from the interosseous and adjacent surfaces of the radius and ulna
Attaches to the lateral side of the base of metacarpal I
Action of abductor pollicis longus
Abducts the thumb
Innervation of abductor pollicis longus
Radial nerve (posterior interosseous branch)
Origin and attachment of extensor pollicis brevis
Originates from posterior surface of the radius and interosseous membrane
Attaches to proximal phalanx of the thumb
Action of extensor pollicis brevis
Extends at metacarpophalangeal joints and carpometacarpal joints of the thumb
Innervation of extensor pollicis brevis
Radial nerve (posterior interosseous branch)
Origin and attachments of extensor pollicis longus
Originates from posterior surface of ulna and interosseous membrane
Attaches to the distal phalanx of the thumb
Action of extensor pollicis longus
Extends all joints of the thumb
Innervation of extensor pollicis longus
Radial nerve (posterior interosseous branch)
Origin and attachments of extensor indicis proprius
Originates from the posterior surface of the ulna and interosseous membrane
Attaches to the extensor hood of the index finger
Action of extensor indicis proprius
Extends the index finger
Innervation of extensor indicis proprius
Radial nerve (posterior interosseous branch)
… is a thick strip of connective tissue which forms the roof of the carpal tunnel
Flexor retinaculum
Attachments of flexor retinaculum
Medially- Pisiform and hook of hamate
Laterally- Trapezium and scaphoid
… is a thickening of the fascia on the dorsum of the hand keeps the extensor tendons in position
Extensor retinaculum
The radial and ulnar arteries are formed by bifurcation of the … within the cubital fossa
Brachial artery
Radial artery supplies the … aspect of the forearm
Posterolateral
Ulnar artery supplies the … aspect of the forearm
Anteromedial
Radial and ulnar arteries anastomose in the hand forming two arches which are …
Superificial palmar arch
Deep palmar arch
