Muscles Of The Forearm And Cubital Fossa Flashcards
How many muscles are in the anterior compartment of the forearm and how are they grouped?
Consists of 8 muscles
Divided into 3 groups
1. Superficial group with 4 muscles
2. Intermediate group with 1 muscle
3. Deep group with 3 muscles
The muscles of anterior compartment muscles of forearm are innervated
Innervated by median and ulnar nerves
Name the muscle of the superficial group of the forearm
- Pronator Teres muscle
- Palmars longus
- Flexor carpi radialis
- Flexor carpi ulnaris
Name the muscle of the superficial group of the forearm innervated by median nerve
Palmaris longus
Flexor carpi radialis
Pronator Teresa muscle
Name the muscle of the forearm in the superficial group that is innervated by ulnar nerve
Flexor carpi ulnaris muscle
The insertion , action and origin of the pronator teres muscles
Originates from medial epicondyle and coronoid processes of the ulna
They insert at the Lateral aspect of the shaft if the radius
Their action is Pronation
The action, insertion and origin if the flexor carpi radialis muscle
Originates at the medial epicondyle of the humerus.
Insert at the base of the second and third metacarpals
Action: flexion and abdution at the wrist joint
The origin, insertion and action of palmaris longus muscle
Originates at the medial epicondyle of the humerus
Insert at the Palmar aponeuorosis and distal half of the flexor retinaculum
Action: Tenses Palmar aponeurosis and flexes the wrist
The origin, insertion and action of flexor carpi ulnaris of muscles
Originates Medial epicondyle and posterior border of ulna
Insert at the pisiform, hook of hamate and the base of the 5th netacarpal
Action: flexion and adduction of the wrist joint
The muscle of the anterior compartment under intermediates group
Flexor digitorum superficialis muscle
The origin and insertion of the flexor digitorum superficialis muscle
Origin: medial epicondyle and coronoid process of the humerus
Anterior surface of radius
Insertion: Palmar surface of the shaft of the middle phalanges of the medial 4 digits
The action and innervation of flexor digitorum superficialis muscle
Action: flexion of the proximal interphalangeal joints
May assits in flexion of the wrist and metacarpophalangeal joints
Innervated by median nerve
Name the muscles of the deep group of the anterior compartment
Flexor digitorum profundus
Flexor pollicis longus muscle
Pronator quadratus muscle
The origin and insertion of flexor digitorum profundus muscle
Origin- anterior and medial surfaces of ulna
Medial half of the interosseous membrane
Insert at the bases of the distal phalanges of the medial four digits
The action and innervation of flexor digitorum profundus muscle
Action
- Flexion of the distal interphalangeal joints
Innervation
- Medial half by the ulnar nerve
- Lateral half by the anterior interosseous nerve
- From the median nerve
The origin and insertion of flexor pollicis longus
Origin
- Anterior surface of the shaft of the radius
Insertion
- Base of the distal phalanx of the thumb
The action and innervation of flexor pollicis longus
Action
- Flexion of the interphalangeal joint of the thumb
Innervation by anterior interosseous nerve from median nerve
The origin and insertion pronator quadratus muscles
Origin
- Distal surface of the anteromedial aspect of the ulnar shaft
Insertion
- Distal surface of the anterolateral aspect of the radial shaft
The action and innervation of pronator quadratus muscle
Action
- Pronation
Innervation by anterior interosseous nerve from median nerve
The cubital fossa is covered by what?
- Covered by skin and fascia
The base of the cubital fossa
Imaginary line between the humeral epicondyles
The lateral and medial border of the cubital fossa
Lateral border
Brachioradialis muscle
Medial border
Pronator teres muscle
The roof and floor of the cubital fossa
Roof
Skin, fascia, superficial nerves and vessels
Floor
Brachialis and supinator muscles
The content of cubital fossa
Tendon of the Biceps brachii muscle
- Brachial artery
- Median nerve
The posterior compartment comprised of superficial and deep group that are grouped in into 3s name those group
-They are grouped in 3s
- 3 go to the wrist
- 3 go to the thumb
- 3 go to the fingers
- 3 are additional
The origin and insertion of brachioradialis muscle
Origin
- Proximal part of the lateral supraepicondylar ridge of the humerus
- Adjacent intermuscular septum
Insertion
- Lateral surface of distal end of radius
The action and insertion of brachioradialis muscle
Action
- Accessory flexor of elbow joint when forearm is midpronated
Insertion by the Radial nerve
The origin and insertion Extensor carpi radialis longus muscle
Origin
- Lateral supraepicondylar ridge of the humerus
Insertion
- Dorsal surface of base of the 2nd metacarpal
The action and innervation of extensor carpi radialis longus muscle
Action
- Extends and abducts at the wrist joint
Innervation
- Radial nerve
The origin and insertion of extensor carpi radialis brevis
Origin
- Lateral epicondyle of humerus and adjacent intermuscular septum
Insertion
- Dorsal surface of base of 2nd and 3rd metacarpals
The action and innervation of extensor carpi radialis brevis
Action
- Extends and abducts at the wrist joint
Innervation
- Deep branch of the radial nerve
The origin and in insertion extensor digitorium
Origin
- Lateral epicondyle of humerus
- Adjacent intermuscular septum and deep fascia
Insertion
- Inserts via extensor hoods of medial 4 digits
The action and innervation of extensor digitorum
Action
- Extends medial 4 digits
Innervation by the Posterior interosseous nerve from radial nerve
The origin and insertion extensor digit minim muscle
Origin
- Lateral epicondyle of the humerus
- Adjacent intermuscular septum
Insertion
- Extensor hood of the little finger
The innervation and action of extensor digit minim muscle
Action
- Extension of the little finger
Innervation by the Posterior interosseous nerve from radial nerve
The origin and insertion extensor carpi ulnaris muscle
Origin
- Lateral epicondyle of the humerus and posterior border of ulna
Insertion
- Tubercle on the base of the medial side of the 5th metacarpal
The innervation and action of extensor carpi ulnaris muscle
Action
- Extends and adducts at the wrist joint
Innervation by the Posterior interosseous nerve from radial nerve
The origin and insertion of anconeus muscle
Origin
- Lateral epicondyle of the humerus
Insertion
- Olecranon and proximal posterior surface of ulna
The innervation and action of anconeus muscle
Action
- Abducts the ulna during pronation
Innervation
- Radial nerve
The origin and insertion of supinator muscles
Origin
- Superficial layer
- Humeral lateral epicondyle, radial collateral and annular ligament
- Deep layer at the supinator crest of the ulna
Insertion
- Lateral surface of the radius
The action and innervation of supinator muscle
Action
- Supination
Innervation by the Posterior interosseous nerve from radial nerve
The origin and insertion of extensor indicis muscle
Origin
- Posterior surface of the ulna
- Adjacent interosseous membrane
Insertion
- Extensor hood of the index finger
The action and innervation of extensor indicis muscle
Action
- Extends the index finger
Innervation by the Posterior interosseous nerve from radial nerve
the origin and insertion of extensor pollicis longus muscle
Origin
- Posterior surfaces of the ulna
- Adjacent interosseous membrane
Insertion
- Dorsal surface of base of proximal phalanx of the thumb
The action and innervation of extensor pollicis longus muscles
Action
- Extends interphalangeal joint of the thumb
Innervation by the Posterior interosseous nerve from radial nerve
The origin and insertion of extensor pollicis brevis muscle
Origin
- Posterior surfaces of the radius
- Adjacent interosseous membrane
Insertion
- Dorsal surface of base of proximal phalanx of the thumb
The action and innervation of extensor pollicis brevis muscle
Action
- Extends metacarpophalangeal joint of the thumb
Innervation by the Posterior interosseous nerve from radial nerve
The origin and insertion of abductor pollicis longus muscle
Origin
- Posterior surfaces of the ulna and radius
- Adjacent interosseous membrane
Insertion
- Lateral side of the base of the first metacarpal
The action and innervation of abductor pollicis longus muscle
Action
- Abducts carpometacarpal joint of thumb
Innervation by the Posterior interosseous nerve from radial nerve
what forms the floor of anatomy snuffbox
scaphoid
which pulse that can be found in the anatomy snuffbox
pulse of radial artery
name the muscles that bounds the anatomy snuffbox medial and laterally
- Extensor pollicis longus muscle (Medially)
- Abductor pollicis longus and Extensor pollicis brevis muscles
(Laterally
- Abductor pollicis longus and Extensor pollicis brevis muscles
